Terms Of Engine Speed Research Articles

Evaluation of engine characteristics of a micro-gas turbine powered with JETA1 fuel mixed with Afzelia biodiesel and dimethyl ether (DME)

The use of Jet fuels in micro gas turbines results in high fuel consumption and increased gaseous emissions which in turn causes environmental pollution. In this study, a fixed proportion of Afzelia-Africana biodiesel (A) was mixed with dimethyl-ether (B) and Jet A1 (J) fuel of varying proportions, A10B10J80 (10% biodiesel, 10% dimethyl-ether, 80% Jet fuel), A10B15J75 (10% biodiesel, 15% dimethyl-ether, 75% Jet fuel), and A10B20J70 (10% biodiesel, 20% dimethyl-ether, 70% Jet fuel) in a bid to produce a fuel of improved properties. Their properties were compared with those of their pristine forms by testing the fuels in the gas turbine in order to ascertain the resulting engine emissions, thrust and thrust specific fuel consumption. Compared to the JETA1 fuel, the A10B10J80 fuel gave the best results in terms of engine speed, thrust (37 N) and thrust specific fuel consumption (4.3/h vs 5/h); the CO2, NOx, and CO emissions were lower for the blended fuels compared to those of the JET fuel. The A10B15J75 and A10B20J70 fuels gave 3 and 4.5% lower thrusts respectively, while the A10B10J80 fuel gave 3% increase in static thrust with a 14% reduction in its thrust-specific fuel consumption over the JET A1 fuel.

Influence of single and dual mass flywheel usage in IC engines on the resonance behavior of the power transmission system

In internal combustion engines, due to the transmission of torsional vibrations caused by the irregularity of the combustion process to the gearbox, resonance occurs especially at low engine speeds. Resonance causes noise in the power transmission system. Therefore, driving comfort reduces and additional loads on the gearbox arise. Nowadays, with the concern of fuel consumption, the manufacturers turn to engine designs that keep the engine's working range as wide as possible. In this study, the mathematical models of power transmission systems using single-mass and dual-mass flywheel were analyzed and both systems were compared in terms of engine speed at which resonance occurs. In addition, the effects of the design parameters such as the mass moment of inertia and spring stiffness on the resonance behavior of the power transmission system using dual mass flywheel were examined. It has been observed that the dual mass flywheel drops the speed which resonance occurs in the power transmission system far below engine idle speed so that the resonance speed is kept away from the engine's working range.

Exhaust Gas Analysis of an Eight Cylinder Gasoline Engine Based on Engine Speed

Abstract In this experimental work, exhaust gas analysis of an eight cylinder and v-type gasoline engine, namely, a Chevrolet 5.7, is experimentally performed in terms of engine speed at laboratory conditions by using of an exhaust gas analyzer and the special software called “NetDyn” and “WinDyn”. The engine test setup includes a dynamometer to determine the engine torque and data acquisition system. At the experimental works, the engine speed ranges from 2500 rpm to 5250 rpm and step time for successive speeds is held constant as 10 s. A throttle position of 60 is selected for the engine operation. Exhaust gas emissions such as O2, CO, NOx and SO2, are measured in terms of engine speed. Exhaust gas temperature and excess air coefficient are also measured as a function of the engine speed during the experiments.

Diesel engine performance and emission evaluation using Canola biodiesel emulsion fuel

Diesel engines exhausting gaseous emission and particulate matter have long been regarded as one of the major air pollution sources. The emulsification method is not only motivated by cost reduction but is also one of the potentially effective techniques to reduce exhaust emission from diesel engines. An experimental investigation was carried out to produce a biodiesel emulsion fuel to be used in a diesel engine under different operating conditions. The proper mixing technique and surfactants were used to produce stable emulsions of 15% water by volume in biodiesel. The properties of emulsion fuel such as density, viscosity and pour point were observed. The performance of a single cylinder diesel engine in terms of engine speed, brake power output, specific fuel consumption, brake thermal efficiency, exhaust gas temperature and emissions such as NOx and particulate matter were measured and analysed with the prepared emulsified biodiesel. The results showed that the water emulsification has a potential to improve the diesel engine performance and to reduce gas pollutants.

Driver Rating based on Interval Type-2 Fuzzy Logic System

In recent years, especially considering environmental awareness and low pollution, economical and safe driving is crucial in automotive applications. In this study, a driving rating method based on interval type-2 fuzzy logic system is proposed. Aggressive and normal driving behaviors are considered. Then, the driving behaviors are analyzed and compared in terms of engine speed, acceleration, accelerator pedal position, engaged gears, and fuel consumption values. The simulation studies indicate that the proposed driving rating method is efficient in rating aggressive and normal driving behaviors. In addition, driving behavior impact on fuel consumption is analyzed.

G070013 DPF再生用排気昇温パーナの安定燃焼化に関する研究

It is known that Diesel Particulate Filters (DPF) are able to largely reduce the emission of Particulate Matter (PM) from the exhaust gas of diesel engines. When operating conditions continue, however, over long times where the exhaust temperature does not exceed a certain level, PM accumulates in the DPF causing blockage. Devices are needed to rise the exhaust temperatures such that the PM is burnt. In this study, we paid attention to the burner which constitutes the temperature-raising device. One important specification for such a device is that it works without failure even for conditions where exhaust velocity or residual oxygen concentration vary in adverse directions. Various experiments regarding the combustion chamber shape have been performed. As a result, we succeeded in the development of a "Simple Structure" and "Low Cost" burner, which reduces the needed auxiliary combustion air to the burner as much as possible. After characterizing the operating conditions in terms of engine speed, temperature raise and oxygen concentration, the structure of the new burner is presented and the performance demonstrated by temperature histories.

차축의 중량 분포와 타이어의 공기압이 트랙터 작업의 연료 효율에 미치는 영향

, 2011)This study was conducted to investigate the effects of axle weight distribution and inflation pressure of tire on the fuel economy of tractors as well as operational range of tractor engine in terms of engine speed and power when a 4WD tractor of 38.2 kW rated power at 2500 rpm is used for plowing and flooded-field rotavating in paddy fields. (1) Plowing operation required an average engine power of 9.6~13.5 kW which equals 25~35% of rated PTO power. Engine speed ranged from 1,320.4 to 1,737.4 rpm, work velocity from 3.4 to 4.8 km/h, and fuel consumption from 3.2 to 4.2 L/h, respectively.(2) Flooded-field rotavating required an average engine power of 11.5~18.5 kW which equals 30~48.4% of rated PTO power. Out of this 6.2~12.2 kW was used for PTO power. Engine speed ranged from 1,557 to 2,067 rpm, work velocity from 2.5~5.4 km/h and fuel consumption from 3.2~5.5 L/h, respectively.(3) Axle weight distribution, inflation pressure of tire and moisture content of soil did not affect significantly the specific volumetric fuel consumption but affected significantly the fuel consumption per unit area of operation. Fuel savings amounted to 65% in plowing operation and 20% in flooded-field rotavating when the axle weight distribution and inflation pressure of tire were optimally adjusted.(4) Optimal adjustment of axle weight distribution and inflation pressure of tire are expected to save fuel consumption by 10~65% per unit area of operation in plowing and 10~20% in flooded-field rotavating.

Impact of Emulsified Water/Diesel Mixture on Engine Performance and Environment

An experimental investigation was carried out to produce a stable diesel-water emulsion fuel to be used in a diesel engine under different operating conditions. The proper mixing technique and emulsifying agent were used to produce stable emulsions of 10% to 30 % water by volume in diesel. The stability of these emulsions ranges from one week up to 4 weeks. The physical properties of stable water-diesel emulsions such as density, viscosity and pour point were observed. The effect of water-diesel concentrations, on the performance of a single cylinder diesel engine in terms of engine speed, torque, brake power output, brake specific fuel consumption, brake thermal efficiency, exhaust gas temperature and emissions such as NOx and particulate matter (PM) were studied. The results showed that the water emulsification has a potential to improve the diesel engine performance and to reduce gas pollutants.

Characteristics of Particulate Emissions of Compression Ignition Engine Fueled With Biodiesel Derived From Soybean

An experimental investigation was performed on the effect of engine speed, exhaust gas recirculation (EGR), and boosting intake pressure on the particulate size distribution and exhaust gas emissions in a compression ignition engine fueled with biodiesel derived from soybean. The results obtained by biodiesel fuel were compared to those obtained by petroleum diesel fuel with a sulfur content of 16.3ppm. A scanning mobility particulate sizer was used for size distribution analysis, and it measured mobility equivalent particulate diameter in the range of 10.4–392.4nm. In addition to the size distribution of the particulates, exhaust emissions, such as oxides of nitrogen (NOx), hydrocarbon, and carbon monoxide emissions, and combustion characteristics under different engine operating parameters were investigated. The engine operating parameters in terms of engine speed, EGR, and intake pressure were varied to investigate their individual impacts on the combustion and exhaust emission characteristics. As the engine speed was increased for both fuels, the larger size particulates, which dominantly contribute particulate mass, were increased; however, total numbers of particulate were reduced. Compared to diesel fuel, the combustion of biodiesel fuel reduced particulate concentration of relatively larger size where most of the particulate mass is found. Moreover, dramatically lower hydrocarbon and carbon monoxide emissions were found in the biodiesel-fueled engine. However, the NOx emission of the biodiesel-fueled diesel engine shows slightly higher concentration compared to diesel fuel at the same injection timing. EGR significantly increased the larger size particulates, which have diameter near the maximum measurable range of the instrument; however, the total number of particulates was found not to significantly increase with increasing EGR rate for both fuels. Boosting intake pressure shifted the particulate size distribution to smaller particulate diameter and effective reduction of larger size particulate was found for richer operating conditions.