Fly In Air Research Articles

Towards a Mechanistic Understanding of the Slagging Propensities of Petroleum Coke: Lessons Learned from Its Co-Combustion with Natural Gas in Oxygen-Enriched Atmospheres

A Computational Fluid Dynamic study was carried out to match the measured outer ash deposition rates associated with the combustion of petroleum coke (PC)–natural gas in AIR and O2/CO2 (70/30 vol%, OXY70). The fly ash PSD associated with high-fixed-carbon, non-porous fuel was estimated using a shrinking sphere burnout model and employed in conjunction with particle kinetic energy (PKE), particle viscosity (µP), and a critical Weber-number-based capture criterion. Deposition rate predictions were sensitive to the fly ash composition employed for estimating µP due to the significant enrichment of Fe in the deposits. Predictions were insensitive to the specific µP model formulation employed or whether the V2O5 in the ash was assumed to play the role of a glass former or a glass modifier. OXY70 scenario impaction rates were significantly lower than the measured deposition rates when the fly ash PSD associated with the AIR scenario was employed in the calculations. This necessitated an ad hoc modification of the OXY70 fly ash PSD to a coarser range to match the measurements and attributing it to agglomeration resulting from longer residence times and higher temperatures. This shift in PSD was in line with AIR and OXY70 fly ash PSD measurements reported previously.

Joint Trajectory Design and Power Allocation for UAV Assisted Network With User Mobility

This paper investigates the unmanned aerial vehicle (UAV) assisted wireless communications where the UAV acts as the aerial base station to provide downlink data service to the ground users. We consider a typical hot-spot scenario in which the ground users move towards the target points of interests (PoIs) in groups. The UAV can also fly in air to cope with the movement of users. To maximize the system throughput, an optimization problem is formulated to jointly determine the subchannel assignment, the trajectory of UAV and its power allocation per time slot, where the navigation power of UAV, the co-channel interference as well as the quality of service (QoS) requirements of users are taken into account. As the problem is non-convex and hard to solve, we propose a cascade approach. First, we design a user clustering and pairing algorithm to accomplish the subchannel assignment. Then, we apply the block coordinate descent (BCD) based framework to decompose the remaining problem into the power allocation sub-problem and the trajectory design one. The sub-optimal solution can be gradually achieved through alternatively solving these two sub-problems. As for the power allocation sub-problem, we opt to the difference of convex (DC) functions form and the successive convex approximation (SCA) method to solve it. While for the trajectory design sub-problem, the auxiliary variables and SCA method are utilized. Vivid simulation results reveal that the proposed iterative algorithm can well satisfy the QoS of users and achieve significant performance gain compared with other benchmark schemes.

Development and Performance Test of Vertical Bed Dryer for Drying of Corn Kernel

This research aims to develop the design of vertical bed dryer which could dry corn kernel. The dryer characteristics has been investigated. The dryer design consists of three chambers which each in order to facilitate of inlet hot air dryer stream, corn kernel chamber, and outlet wet air. Each chamber was separated by perforated plate steel. Air flew by a blower and heated by 2 x 350 heaters. The research parameter was: (a) drying air temperature, varied 50-60 oC, (b) air velocity varied of 2-4 m/s, blower power (W), and moisture content, mc (%). The resuts shows that moisture content decreasing of 5 kg corn kernel from 20% to 10% took 24-26 minutes.

Analysis of Air Flow inside the Compartment under Backdraft Conditions using Solid Combustibles

Backdraft is a phenomenon of explosive combustion that occurs when fire in a state of smoldering due to the lack of oxygen grows as the air is admitted after opening the entrance door or window. In this study, a reduced compartment was produced to simulate a backdraft. In an actual site, the fire was generated by solid combustibles, and hence, wood pieces were used to generate the backdraft in this study. Twenty-seven thermocouples were installed inside the compartment. One side of a wall consists of polycarbonate and the interior of the compartment was monitored using a camera. An additional fire simulation was performed using a fire dynamics simulator for in-depth analysis of the phenomena inside the compartment. In the experiment, the air flown into the compartment through the vent opening turned the smoldering fire of solid combustibles into the flaming fire, which led to the ignition of flammable gas inside the compartment. Next, the propagation of the flame was first directed upwards to the combustibles, then towards the center, and ultimately to the exterior. This phenomenon was observed in the analysis of the compartment holding a homogeneous flammable mixture. The results of the analysis showed that the flammable mixture on the interior was released to the exterior because of the rise in the internal pressure caused by flame propagation. Consequently, as the internal flame was propagated to the exterior, the mixture was ignited. Thus, the phenomenon of backdraft in the case of compartment fire was shown to occur as follows. First, the air flown in via the vent opening was elevated to the upper part of the compartment by the smoldering heat on the interior. Next, the flame led to the ignition of the flammable mixture formed on the upper part.

Land–Air–Wall Cross-Domain Robot Based on Gecko Landing Bionic Behavior: System Design, Modeling, and Experiment

Based on the bionic behavior of geckos, this paper presents a land–air–wall cross-domain robot which can fly in air, run on the ground, and adhere to various wall surfaces. When geckos jump and adsorb to vertical surfaces such as trunks, they can still adsorb to the wall with a large contact speed. Inspired by this phenomenon, we analyze the mechanism, apply it to our robot, and optimize the design of the robot structure. In addition, geckos use their tails to adjust posture to achieve abdominal landing during the process of falling. Inspired by this phenomenon, based on the rotor lift/power curve, we optimize the center of gravity by controlling the servo angle. The initial center of gravity offset of the robot is estimated by the extended state observer. The method reduces the distance between the center of gravity and the geometric center, balances the load of each propeller, and finally reduces the total power. The experiment and simulation results validate the feasibility of the land–air–wall cross-domain robot and the bionic methods.

A Comparative Talk on Women Era

In the original philosophy of Mahatma Gandhi the proverbial principle is to “see no evil, hear no evil, and speak no evil”. Probably a fourth monkey should have been shown with crossing his arms as to convey “do no evil” or “do nothing”. Looking it in other way would mean, refusing to acknowledge it or feigning ignorance. It seems that in the present scenario with reference to Women era, gives us a feeling to have a relook at the three wise monkeys in a manner as shown above. The principles of jurisprudence are not confined to the texts in Sanskrit. Manu attests that custom is the foremost basis of jurisprudence. Customary law delimits Brahamnic legal theory. And customs differ according to districts, towns, castes guilds and corporations. Manu asserts the precedence of provincial custom. The Dharma Shastras are the pre-eminent Hindu legal texts written in Sanskrit, excerpts of which were translated into the early Javanese and Khmer languages. Niti i.e. Justice, is based on Dharma, which is moral law in these works. The term dharma may be traced from the root word dhr which means sustains or supports. The expressesion seems to have a wide range of meaning. It signifies the prudence of highest virtue to human welfare. We know how to swim In water like fishes We know how to fly In air like birds But we do not know how to Live on earth like human beings. Alexander Selkirk

시뮬레이션을 통한 어린이집의 주방 조리 시 미세먼지 증가 및 인접실로의 확산 특성, 대책안 적용 효과의 분석

The purpose of this study is to analyze the increase of PM2.5 concentration generated during cooking in a daycare center and the effect of removing countermeasures was analyzed by simulation method. The concentration of PM2.5 exceeded the upper limit of the relevant guidelines when cooking in the kitchen. The PM2.5 was moved from the cooking room to the staircase through the corridor. When the hood was operated under this condition, about 64.3% of PM2.5 was removed. However, when the hood was operated in the kitchen, negative pressure was generated and air flew into the child-care room, and the concentration of PM2.5 in the child-care room increased due to the influx of high PM2.5 concentration. The PM2.5 concentrations in the child-care rooms at the third floor and rooftop were also reduced by about 50%. In this situation, even if the children were active in the child-care rooms, the PM2.5 concentration in the cooking room was not significantly different. However, since the increased PM2.5 concentration, resulting from children’s activities, exceeded the standard value countermeasures to remove it were necessary. When the ventilation system was operated as a countermeasure to eliminate this, the average removal effect was 76% and all child-care rooms, except the one on the first floor, met the standard value. In addition, when the air cleaner was operated, it showed an average of 56% removal performance and the results were higher than the standard value in all child-care rooms where children were active. Lastly, when the ventilation system and the air cleaner were operated at the same time, the average removal effect was 80% and PM2.5 concentration in the child-care room on the first floor could not be solved by the ventilation system alone, it was maintained below the standard value using an air cleaner.

Swimming, flying, and diving behaviors from a unified\xa02D potential model

Animals swim in water, fly in air, or dive into water to find mates, chase prey, or escape from predators. Even though these locomotion modes are phenomenologically distinct, we can rationalize the underlying hydrodynamic forces using a unified fluid potential model. First, we review the previously known complex potential of a moving thin plate to describe circulation and pressure around the body. Then, the impact force in diving or thrust force in swimming and flying are evaluated from the potential flow model. For the impact force, we show that the slamming or impact force of various ellipsoid-shaped bodies of animals increases with animal weight, however, the impact pressure does not vary much. For fliers, birds and bats follow a linear correlation between thrust lift force and animal weight. For swimming animals, we present a scaling of swimming speed as a balance of thrust force with drag, which is verified with biological data. Under this framework, three distinct animal behaviors (i.e., swimming, flying, and diving) are similar in that a thin appendage displaces and pressurizes a fluid, but different in regards to the surroundings, being either fully immersed in a fluid or at a fluid interface.

EFEK PENAMBAHAN EVAPORATOR PADA ATMOSPHERE WATER HARVESTER (AWH) TERHADAP PERFORMA SISTEM

Atmosphere Water Harvester (AWH) was investigated to get water collected from air in elevated performance. Improvement was performed by introducing a series-arrangement of two evaporators. Air flew through the evaporators in cross-flow. This arrangement would influence performance of the AWH system in title of COP, MHI, and specific energy consumption. The AWH was designed using vapor compression refrigeration system. Parameter measured to the system were refrigerant temperature in suction and discharge line, inlet and outlet pipe wall temperatures at evaporator and condenser, air velocity enter into evaporator, and electrical energy consumption. Instrument used in this research were refrigerant pressure-temperature gauge, K-type digital thermometer, digital fan anemometer, thermo-hygro meter, and kWh meter. Air temperature and RH data were 36,5 oC, 40%, and 19 oC, 42 % for inlet and outlet air stram at evaporator, subsequently. With air velocity 1.5 m/s, the COP of the system was 3.7. Water collected from AWH was 1.1 litres/hour with energy consumption of 1.24 kWh. The AWH could be considered as a water harvester with value of specific energy of 1.13 kWh/litre and MHI of 0,2.

Effects of flight altitude on the lift generation of monarch butterflies: from sea level to overwintering mountain

Aerodynamic efficiency behind the annual migration of monarch butterflies, the longest among insects, is an unsolved mystery. Monarchs migrate 4000 km at high-altitudes to their overwintering mountains in Central Mexico. The air is thinner at higher altitudes, yielding reduced aerodynamic drag and enhanced range. However, the lift is also expected to reduce in lower density conditions. To investigate the ability of monarchs to produce sufficient lift to fly in thinner air, we measured the climbing motion of freely flying monarchs in high-altitude conditions. An optical method was used to track the flapping wing and body motions inside a large pressure chamber. The air density inside the chamber was reduced to recreate the higher altitude densities. The lift coefficient generated by monarchs increased from 1.7 at the sea-level to 9.4 at 3000 m. The correlation between this increase and the flapping amplitude and frequency was insignificant. However, it strongly correlated to the effective angle of attack, which measures the wing to body velocity ratio. These results support the hypothesis that monarchs produce sufficiently high lift coefficients at high altitudes despite a lower dynamic pressure.

The Linear Equation for 2D Graphs

What is y=mx+c? What is one dimensional? If a thing like fish/bird while in motion in water/air cannot turn left, right and backward. It can only move forward in a medium or fly in air. When I try to determine its motion, I see it as one dimensional. It is not necessary that the bird/fish is moving in a straight line. It is the sheer concentration of the medium the fish /bird is traversing in. So, the behavior of a one dimensional motion maybe a function of the medium with a concentration/penetration quotient of the medium based on the weight of the fish/bird which penetrates the medium and the effect of gravity on it. We can depict a one dimensional motion as, One Dimensional motion=f(weight)* f(penetration quotient)*f(Force exerted by the fish/bird while it is penetrating the medium) What is one dimensional coordinate? We can say that it is a vector (V) which moves in any direction but not necessarily a straight line . If “x” is a one dimensional coordinate value, it is very difficult to find the value of “x” . If suppose the path traversed by “x ” is not a definite symmetrical pattern but an ambiguous pattern like below: Fig 1 Then we do not have a numerical value for “x”. It is not measurable through a scale. We cannot find the value of “x”. In this case the only way “x” can be measured is through a straight line if “x” is moving in one direction only. A question arises whether time is moving in a circular pattern or in a straight line .We measure it as a distance/displacement and we have deemed such a scale of measurement as one dimensional. But I want to measure the quantity the fish/bird had travelled in one minute. We might get some value by defining the area it had traversed in one minute which is a two dimensional quantity.

“Proceed to some other port where our flag may fly in air that is not tainted with the stench of apartheid” – The intersection between the domestic and international anti-apartheid campaign and American naval visits to South Africa, 1948–1967

The introduction of apartheid in 1948 with its extensive suite of discriminatory laws, had a wide-ranging impact on South Africa’s international relations. Despite an ever-growing global anti-apartheid movement and calls for the country’s total isolation, the country succeeded in maintaining naval relations with several nations. As a result, it frequently hosted shipping crews from Europe and Northern America, mostly on flag-displaying missions. During these visits, non-White sailors were subjected to South Africa’s racial laws and entertained separately from their White counterparts. In following the principle of respecting “local law and custom”, commanders of vessels became willing collaborators in enforcing apartheid. Over two decades (1948–1967), racially-defined events and activities at segregated facilities became a standard feature of these visits. Under the influence of the local and American activists who viewed their civil rights- and anti-apartheid struggle as a common one, all forms of collaboration with the racist regime, were roundly condemned. By 1967, as a result of continuous mobilisation and the use of a diversity of mechanisms, the American anti-apartheid movement in co-operation with their local counterparts, succeeded in, among others, forcing a change in their country’s naval policy and its relations with South Africa. Effectively this led to the termination of American naval flag-display visits to South African ports from 1967-1994.

Seasonal diversity of water birds of Tapti River in Burhanpur District (M.P.)

Birds have been always fascinated for their ability to fly in air and for their exquisite coloration. They have their functional role in the ecosystem as potential pollinators and scavengers, and are rightly called as bio-indicators. The avifaunal diversity in Tapti River from Dedtalai to Burhanpur M.P. was studied for a period of one and half years (July 2017 –January 2019) The River inhabits several local and migratory bird species. Reduction in water retention in this river in summer has affected the avifaunal diversity in the study area. This habitat attracted 29 bird species belongs to 10 families, which are local and migratory. Highest population of migratory Red crested pochard, Spot billed Ducks and Great whistling Ducks were recorded in January while residents were herons and little cormorants.

Fire Spread of Thermal Insulation Materials in the Ceiling of Piloti-Type Structure: Comparison of Numerical Simulation and Experimental Fire Tests Using Small- and Real-Scale Models

Large-scale fires mainly due to the ignition of thermal insulation materials in the ceiling of piloti-type structures are becoming frequent. However, the fire spread in these cases is not well understood. Herein we performed small-scale and real-scale model tests, and numerical simulations using a fire dynamics simulator (FDS). The experimental and FDS results were compared to elucidate fire spread and effects of thermal insulation materials on it. Comparison of real-scale fire test and FDS results revealed that extruded polystyrene (XPS) thermal insulation material generated additional ignition sources above the ceiling materials upon melting and propagated and sustained the fire. Deformation of these materials during fire test generated gaps, and combustible gases leaked out to cause fire spread. When the ceiling materials collapsed, air flew in through the gaps, leading to flashover that rapidly increased fire intensity and degree of spread. Although the variations of temperatures in real-scale fire test and FDS analysis were approximately similar, melting of XPS and generation of ignition sources could not be reproduced using FDS. Thus, artificial settings that increase the size and intensity of ignition sources at the appropriate moment in FDS were needed to achieve results comparable to those recorded by heat detectors in real-scale fire tests.

A model for environmental quarry system based on particles, vibration and noise components

Environment is the surroundings in which an organization functions, including air, water, land, natural resources, flora, fauna, humans, and their interrelation. Surroundings in this context extend from within an organization to the global system. While the environmental impact refers to any change to the environment, whether adverse or beneficial, wholly or partially resulting from an organization's activities, products or services. Environmental Management System is the part of the overall management system that includes organizational structure, planning activities, responsibilities, practices, procedures, processes and resources for developing, implementing, achieving, reviewing and maintaining the environmental policy. The aim of this study is present model for environmental quarry components which are particles, Vibration and Noise (PVN) object. In addition, this study presented that noise emission sources in quarries and construction sites as being emitted from; mobile equipment, fixed processing plant and equipment, transportation (road and rail), blasting and construction and vibration main classified to Air Overpressure, ground vibration and fly rock and the last noise also dust emissions inventory for quarrying are Drilling, blasting, Handling of limestone, and Mineral processing had high significance dust emissions. To examine the model some sort of descriptive survey has been applied. According to a sort of a group’s random choosing skim, the survey sample population consisted of 285 randomly obtained from people who are living and work surrounding Langkawi Quarry (Malaysia). A significant part of the result discovered environmental quarry relate directly with research main factors such as particles, dust and vibration and its sub factors and the model be useful for environment quarry and practically environmental quarry system.

Gesture Recognition Algorithm: Braille-Coded Gesture Patterns for Touch Screens: Eyedroid

Objectives: The primary objective of this paper is to evaluate the correctness of the algorithm Gesture Recognition that is one of the parts of our novel method ‘Braille coded gesture pattern interaction method”; and to study the performance of Eyedroid system using the statistical methodologies. Methods/Statistical Analysis: The algorithm for gesture recognition was developed and implemented in C program to check the correctness of each step of algorithm. The gesture input parameters Swipe-Minimum-Distance, Swipe-Threshold-Velocity are defined with range of values. Varying gesture input range of values within domain and out of domain results the expected solution space. Our gesture recognition algorithm is developed for 2D touch surface. The Real time experiments were conducted for 12 blind fold subjects to observe the different versions Eyedroid-A(E-A), Eyedroid-B(E-B) of gesture recognition algorithm perceptions, being implemented in smart phones. The mean WPM for 10 trials was recorded for 12 subjects with E-A and E-B. The two tailed paired t test is performed for the mean dependent sample data of wpm. Findings: The existing 3D gesture recognition algorithm Derivative Dynamic Time Warping (DDTW) analyzed by Katarzyna Barczewska, Aleksandra Drozd, 2013 was proven to be efficient method for air fly environment. Our gesture recognition algorithm is developed for 2D touch surface found to be effective by the results of algorithm test. Gesture Recognition algorithm finds the mal gestures and the results proved that there is a significant difference in respect of blind subjects for two different Eyedroid versions. The observed data reveals E-B (mean WPM=14.95) is easy to use than E-A (mean WPM=12) as the number of words entered per minute by E-B is higher than E-A. Our Eyedroid with WPM is 14.95 is obtained to be better interactive system than the existing “Adaptive interaction Technique” system developed by Georgios Y fantidis Grigori Evreinov, 2005 confirms WPM is 12. Applications/Improvements: The implication is our Braille coded gesture pattern that enables visually challenged ones to enter more number of words than by the existing system. Our interaction method is deployable at all kinds of touchable devices.Keywords: Eyedroid-Braille Coded Gesture Pattern, Gesture Recognition Algorithm, t Test for Mobile Interaction

LEARNING FROM EXPERIENCE

The purpose of this study was to explore how pilots potentially learn from their and others‘ experience through post-flight debriefing. Through a case study of pilots who fly air ambulances, this article attempts to illustrate the importance of learning from experience (Bion 1962) among pilots in aviation.

A destructive phase (shift)

A metamaterial approach to wideband radar cross section reduction that is thin, low-cost and doesn't dictate object shaping is presented in work from Iran. The approach uses principles potentially applicable to infrared and visible light as well as radar. The wideband RCS reducing surface is produced on a commercial high-frequency circuit substrate using conventional printed circuit manufacturing techniques Reducing an object's detectability to radar systems is now a well established priority for military applications, most famously in aircraft applications. ‘Stealth’ aircraft that were once well kept secrets are now a familiar concept to the general public and even fly in air shows. The radar cross section (RCS) of an object is essentially a measure of how detectable an object is to radar systems and so reducing an object's RCS is the basic goal of radar focused ‘stealth’ technologies. There are three main approaches to reducing RCS; radar absorbing material (RAM), object shaping and reflected wave cancelling by object coating. RAM materials, as the name suggests, are designed to reduce radar reflections back to the detector by absorbing the electromagnetic energy transmitted by the radar system, converting it into heat. However, they can be bulky and high maintenance. Object shaping works by shaping the surface of the object to minimise reflections of the radar waves back to the radar system, instead reflecting them in other directions. The obvious disadvantage to this approach is that it dictates the shape of the object, which can compromise the performance of the object for its primary purpose. For example, above all an aircraft must be shaped to enable it to fly, an aircraft that is very hard to detect but cannot take off is of no use to anyone. The work reported in this issue, by researchers at Iran University of Science and Technology (IUST) uses the third approach, in which a surface coating reflects the radar waves in such a way as to reduce the amount of radar energy that returns to the detector. This approach is low profile, low bulk and doesn't dictate the shape of the object. In the IUST team's work it can also be cheaply and simply manufactured using printed circuit board manufacturing techniques. Their proposed structure consist of a chessboard arrangement of two different artificial magnetic conductor (AMC) unit cell patterns, each of which reflects the radar waves differently. The key difference in the reflections is a 180° phase shift, which causes the reflections from the two different AMC cell types to interfere destructively and so significantly reduces the useful energy returned to the radar system's detector. “Since radar systems usually send out a short pulse signal in the time domain, wide bandwidth of the RCS reducer is necessary. The proposed AMC structure achieves a RCS reduction over a very wide bandwidth, about 85%,” said Dr Seid Hasan Sedighy, one of the IUST researchers on this project. The wide bandwidth achieved is possible because the critical 180° phase difference in the reflections is produced by the AMC unit cells over a wide frequency range, from 9.4 GHz to 23.28 GHz, providing 10 dB RCS reduction in that range. The peak RCS reduction is in excess of 40 dB, at 15 GHz. Printed circuit manufacturing techniques were used to create the AMC patterns on a commercial high-frequency circuit substrate, providing a low-cost manufacturing method. As flexible circuit board technologies are now available and continue to develop, this AMC-based, effective and relatively cheap approach to RCS reductions could be applied to arbitrary shapes. AMCs are metamaterial structures that behave as perfect magnetic conductors in a limited range of frequencies. The two unit cell AMC patterns used in this work are an arrangement of ‘E’ shapes and saltire arrows. The patterns were optimised to achieve the desired 180° phase difference in their reflections by simulation before being confirmed by experiment. The RCS reducer consists of a chessboard pattern of AMC patches using two different AMC unit cell designs, which produce reflections 180° out of phase with each other. The resulting destructive interference provides the intended RCS reduction The principles of AMCs and using destructive interference to reduce reflected energy are of course applicable to other frequencies of the EM spectrum, not just the band used for radar. This means that similar effects could be achievable in very different frequencies if the structures can be manufactured. Dr Sedighy expects this to lead to developments closer to photonic frequencies “It seems that this design approach will develop in the other frequency bands such as visible and infrared frequencies, which have many civil and military applications.”

Pressure drop and permeability of three-dimensional virtual fibrous medium

Pressure drop is one of the principal performances of the fibrous filtration medium. Traditional computational studies in this area are based on typical unrealistic two-dimensional geometries, with the fibre just placed in a lattice perpendicular to the flow. So in this paper, a three-dimensional virtual fibrous material was developed by means of visual basic application. In the virtual fibrous material, the fibres were arranged randomly by computer and the flow field of virtual fibrous material was calculated. The influence of constructive parameters on pressure drop and permeability was investigated. Simulation shows that flow field velocity distribution was not symmetric. Filtration velocity decreased when the air flew through the fibres, whereas the fluid velocity increased significantly when the distance between fibres was large. Obvious vortex formed in the fibre space areas. The pressure drop was tested experimentally, and the result was compared with that of theoretical and semi-empirical formula calculation. Experimental and simulation data were in agreement with Davies' empirical formula. The simulation result reveals that the pressure drop of fibrous medium increased linearly with the increase of filtration velocity. Moreover, pressure drop non-linearly increased with the increasing solid volume fraction. Simulation results of pressure drop were in good agreement with the predictions of Davies' empirical formula.

Experiments and Numerical Simulation of Flow Field Inner the Chain Plate Fiber Dryer

The numerical calculation model was founded on partial data of the actual test of flow field in chain plate fiber dryer, then the computational fluid dynamics (CFD) software Fluent was adopted to analyze the numerical result of dryer box unit. The result show: the numerical calculation method and data were reliable; the flow relation formula was obtained by air flow experiment in which air flew through fiber layer and chain plate, could be treated as additional momentum source term equation of air through the porous media; owing to the unreasonable setting of open porosity of air distribution plate in the dryer, there was obviously non-uniform air distribution above fiber layer, which would lead to non-uniform drying phenomenon; because of the centrifugal force of fan and diversion effect of volute, there was obvious velocity component in y direction, which could enhance the convective mass transfer effect. The research result could become the basis of design, on which the construction of chain plate fiber dryer was optimized, especially in the optimization of air distribution plate and volute of fan.