Small Wind Tunnel Research Articles

Gaseous nitrogen losses and ammonia volatilization measurement following land application of cattle slurry in the mid-Atlantic region of the USA

To provide locally-determined field data for extension and environmental management purposes, gaseous N losses were measured following cattle slurry application to an arable silty-loam soil in the mid-Atlantic region of the USA. The field had been cropped to no-till maize. NH3 volatilization was measured with the micro-meteorological, integrated horizontal flux (IHF) method, and denitrification with a core incubation method using acetylene inhibition. An early-winter surface application (5 December 1996; 88 m3 ha−1 supplying 91 kg NH4+-N ha−1) was either unincorporated or immediately incorporated. NH3 volatilization was measured from the unincorporated application, and denitrification from both slurry treatments and appropriate control soils. Total NH3 loss from the unincorporated slurry application was 19% of applied NH4+-N; temperatures were cool (4–6 °C), and 25 mm of rain fell within 24 h of application. For 3 months, enhanced denitrification occurred from the two slurry treatments, with generally higher rates from the incorporated slurry. Total net denitrification loss from the surface-applied and incorporated slurry treatments was, respectively, 11 and 17% of applied NH4+-N. Denitrification loss over the winter/early-spring period was appreciable but not substantial, even where NH3 volatilization was restricted by immediate incorporation. From the spring application (30 April 1997, 39 m3 ha−1 supplying 51 kg NH4+-N ha−1), total NH3 loss was 71% of applied NH4+-N. These NH3 volatilization loss data and the similarity of climate suggest that NH3 loss factors from recent NW European work are likely to be generally applicable in the mid-Atlantic region. NH3 volatilization from the spring application was also measured using the Z-instrument (ZINST) approach, and with a system of small wind tunnels. A comparative assessment of the three methods is reported.

An Experimental Study on the Flow Characteristics ofa Supersonic Turbine Cascade as Pressure Ratio

In this paper, a small supersonic wind tunnel was designed and built to study the flow characteristics of a supersonic impulse turbine cascade by experiment. The flow was visualized by means of a single pass Schlieren system. The supersonic cascade with 3-dimensional supersonic nozzle was tested over a wide range of pressure ratio. Highly complicated flow patterns including shocks. nozzle-cascade interaction and shock boundary layer interactions were observed.

교육용 초음속 풍동 개발 및 성능검증에 관한 연구

본 연구에서 시험부 크기 <TEX>$30mm{\times}35.6mm$</TEX>, Run Time 20초인 소형-저가의 초음속 풍동을 개발하였다. 개발원 교육용 초음속 풍동은 단속적 불어내기식형이며 , 노즐 블록 교체형으로 설계되었다. 본 연구를 통하여 초음속 풍동에 사용되는 대형-고가의 기계장비를 기존 소형의 상용 제품으로 대체하여 제작 단가를 낮추었다. 그리고 초음속 풍동의 핵심 기술인 노즐 설계를 비롯한 전체적인 초음속 풍동 설계 기술을 확보하였다. 풍동 시험부에서의 초음속 유동장 형성 및 유동 안정성에 대한 성능검증 실험을 수행하였다. A small size - low priced supersonic wind tunnel of which test section size is 30mm by 35.6mm and run time is 20sec is developed. This educational supersonic wind tunnel is an intermittent blowdown type with an exchangeable nozzle block. In this study, the proper sized and low priced commercial parts are used to reduce the total cost of supersonic wind tunnel. A nozzle design and small supersonic wind tunnel design process has been established, and it is confirmed that a given supersonic flow field has been obtained and proved by experiment.

Predicting ammonia losses following the application of livestock manure to land

A series of experiments was conducted using small wind tunnels to assess the influence of a range of environmental, manure and management variables on ammonia emissions following application of different manure types to grassland and arable land. Wind speed and dry matter content (for cattle slurry in particular) were identified as the parameters with greatest influence on ammonia emissions from slurries. For solid manures, rainfall was identified as the parameter with most influence on ammonia emissions. A Michaelis–Menten function was used to describe emission rates following manure application. Linear regression was then used to develop statistical models relating the Michaelis–Menten function parameters to the experimental variables for each manure type/land use combination. The fitted models accounted for between 62% and 94% of the variation in the data. Validation of the models for cattle slurry to grassland and pig slurry to arable land against independent data sets obtained from experiments using the micrometeorological mass balance measurement technique showed that the models overestimated losses, which was most probably due to inherent differences between the wind tunnel and the micrometerological mass balance measurement techniques.

Fatigue Failure by Flow-Induced Vibration (Effect of Initial Defect Size on Cumulative Fatigue Damage)

A fatigue life prediction method is presented based upon the data obtained due to flow-induced vibration. In the experimental program a small wind tunnel was used to produce flow-induced vibrations of a Styrofoam cylinder. These vibration was transmitted to an attached fatigue specimen. The specimen was made of a medium carbon steel with a small hole drilled into its surface to simulate a defect and to localize the fatigue crack propagation process. A small portable strain histogram recorder (Mini Rainflow Corder, MRC) was used to acquire the service strain histogram and also to measure the variation of natural frequency. Fatigue damage, D, was defined by the Modified Miner's Rule and was determined by using the strain histogram of the early portion of the test record. The values of D were all smaller than 1.0 and ranged from 0.2 to 0.8. The effect of the size of the simulated defect on the values of D was clarified by focusing on the relationship between small crack growth behavior and the strain histogram.

Infrasonic windscreen

Infrasonic windscreens, designed for service at frequencies below 20 Hz, were fabricated from a variety of materials having a low acoustic impedance, and tested in a small wind tunnel against four specifications: (1) attenuation of wind-generated sound (at a free-stream wind speed of 9.4 m/s), (2) the transmission of low-frequency sound from a known source (Janis subwoofer), (3) spectrum of sound generated from trailing vortices, and (4) water absorption (to determine the suitability for all-weather service). Windscreen materials included three woods (pine, cedar, and balsa), polyurethane foam, and Space Shuttle tile material. The windscreen outside diameter ranged from 0.0254 to 0.1016 m (1 to 4 inches), and wall thickness from 0.003175 to 0.01905 m (1/8 to 3/4 inch). A windscreen made of polyurethane foam revealed a wind noise attenuation of 10–20 dB from 0.7–25 Hz, transmission coefficient near unity from 10–25 Hz, and a spectral peak of 23 Hz due to vortex-generated sound. Data will be presented for a variety of windscreens.

Numerical Determination of Personal Aerosol Sampler Aspiration Efficiency

In this work the determination of the aspiration efficiency of personal aerosol samplers, commonly used in occupational exposure assessment, is investigated by means of CFD techniques. Specifically, it will be described a code to calculate the particle trajectories in a given flow field. At the present state the code considers only the effects of the mean flow field on the particle motion, whereas the turbulent diffusion effects are neglected. Comparisons with experimental measurements are also given in the framework of a research contract, supported by the European Community, with several experimental contributions from the participants. The main objective of the European research is to develop a new approach to experimentation with airborne particle flows, working on a reduced scale. This methodology has the advantage of allowing real-time aerosol determination and use of small wind tunnels, with a better experimental control. In this article we describe how the methodology has been verified using computational fluid dynamics. Experimental and numerical aspiration efficiencies have been compared and the influence of gravity and turbulence intensity in full and reduced scale has been investigated. The numerical techniques described here are in agreement with previous similar research and allow at least qualitative predictions of aspiration efficiency for real samplers, taking care of orientation from the incoming air flow. The major discrepancies among predicted and experimental results may be a consequence of bounce effects, which are very difficult to eliminate also by greasing the sampler surface.

Aspiration efficiencies of disc-shaped blunt nozzles facing the wind, for coarse particles and high velocity ratios

In the development of aerosol samplers with desired particle size-selective properties, it is important to understand and be able to predict the physical processes that determine the aspiration of aerosols into their nozzles. An idealized sampling scenario is one involving a disc-shaped blunt nozzle facing the wind. A few earlier studies have investigated this scenario but only for relatively narrow ranges of particle aerodynamic diameter ( d ae) and velocity ratio ( R, the ratio between the air velocity in the approaching freestream and that in the plane of the sampling orifice). The purpose of the current study is to expand this knowledge to larger d ae-values pertaining to the inhalable aerosol fraction and to larger R-values. The issue of sampling at large R is seen to be especially important in relation to our desire to develop low flowrate samplers for occupational hygiene applications. New experiments were conducted for disc-shaped blunt nozzles, varying in disc diameter and orifice diameter, for R ranging from 0.5 to 25. The experiments were conducted in a small wind tunnel using narrowly graded fused alumina powders to produce aerosols with mass median particle aerodynamic diameters up to 90 μm . A highly repeatable set of experimental results showed a broad trend of A increasing with R, with the magnitude of its increase proportional to particle size. This was expected from what is known about aerosol sampling theory. However, a comparison of these data with predictions from an earlier mathematical model showed that, for R increasing above about 2, the predictive model significantly overestimated aspiration efficiency in relation to what was measured in these new experiments. The model, therefore, was modified to include this more expansive set of data, including additional terms involving both R and the dimension ratio ( r, the ratio of the size of the sampling orifice to that of the sampler body). The new, modified model was found to agree very well indeed with the whole data set, as well as with the limited data sets reported earlier. Another notable observation was the relatively small change in A that resulted from a two-fold increase in r. This suggests that within a certain range, r may play only a minor role in determining A. The new model provides physical insights into the performance of blunt samplers when facing the wind, and it will ultimately aid our ability to design new samplers for specific applications.

Management factors affecting ammonia volatilization from land-applied cattle slurry in the Mid-Atlantic USA.

Ammonia (NH3) volatilization commonly causes a substantial loss of crop-available N from surface-applied cattle slurry. Field studies were conducted with small wind tunnels to assess the effect of management factors on NH3 volatilization. Two studies compared NH3 volatilization from grass sward and bare soil. The average total NH3 loss was 1.5 times greater from slurry applied to grass sward. Two studies examined the effect of slurry dry matter (DM) content on NH3 loss under hot, summer conditions in Maryland, USA. Slurry DM contents were between 54 and 134 g kg(-1). Dry matter content did not affect total NH3 loss, but did influence the time course of NH3 loss. Higher DM content slurries had relatively higher rates of NH3 volatilization during the first 12 to 24 h, but lower rates thereafter. Under the hot conditions, the higher DM content slurries appeared to dry and crust more rapidly causing smaller rates of NH3 volatilization after 12 to 24 h, which offset the earlier positive effects of DM content on NH3 volatilization. Three studies compared immediate incorporation with different tillage implements. Total NH3 loss from unincorporated slurry was 45% of applied slurry NH4+-N, while losses following immediate incorporation with a moldboard plow, tandem-disk harrow, or chisel plow were, respectively, 0 to 3, 2 to 8, and 8 to 12%. These ground cover and DM content data can be used to improve predictions of NH3 loss under specific farming conditions. The immediate incorporation data demonstrate management practices that can reduce NH3 volatilization, which can improve slurry N utilization in crop-forage production.

Aspiration characteristics of idealized blunt aerosol samplers at large angles to the wind

The research described in this paper extends the body of work contained in earlier publications in which aerosol sampling aspiration efficiency was studied in a small wind tunnel for simple, idealized sampler geometries. These studies are aimed at providing generic knowledge about the physical and functional behaviors of such systems that can then be generalized to sampling systems of more practical interest. In this paper, attention is focused on the little-researched case of a blunt sampler facing away from the prevailing wind velocity. The results show, that for angles greater than 90 ∘ with respect to the wind, aspiration efficiency and particles losses inside the sampler close to the entry are constant as a function of α. This in itself may have some practical usefulness since it enables the definition of a regime of aerosol performance that is relatively “well-behaved”. These results are in marked contrast to what has been learned from the same body of work for sampler behavior when facing forward with respect to the wind. Here not only does aspiration efficiency vary sharply with orientation, but so too does the particle entry loss. From this it is concluded that no general model of aspiration efficiency can be available so long as experimental results embody unknown entry loss biases. With this in mind, caution is recommended in field sampling or in laboratory experiments where the measurement does not explicitly include such entry losses.

New experimental methods for the development and evaluation of aerosol samplers.

An understanding of the scaling laws governing aerosol sampler performance leads to new options for testing aerosol samplers at small scale in a small laboratory wind tunnel. Two methods are described in this paper. The first involves an extension of what is referred to as the "conventional" approach, in which scaled aerosol sampler systems are tested in a small wind tunnel while exposed to relatively monodisperse aerosols. Such aerosols are collected by test and reference samplers respectively and assessed gravimetrically. The new studies were carried out for a modified, low flowrate version of the IOM personal inhalable aerosol sampler. It was shown that such experiments can be carried out with a very high level of repeatability, and this supported the general validity of the aerosol sampler scaling laws. The second method involves a novel testing system and protocol for evaluating the performances of aerosol samplers. Here, scaled aerosol samplers of interest are exposed to polydisperse aerosols, again in a small wind tunnel. In this instance, the sampled particles are counted and sized using a direct-reading aerodynamic particle sizer (the APS). A prototype automated aerosol sampler testing system based on this approach was built and evaluated in preliminary experiments to determine the performance of another modified version of the IOM personal inhalable aerosol sampler. The design of the new test system accounts for the complex fluid mechanical coupling that occurs near the sampler inlet involving the transition between the external flow outside the sampler and the internal airflow inside the sampler, leading in turn to uncontrolled particle losses. The problem was overcome by the insertion of porous plastic foam plugs. where the penetration characteristics are well understood, into the entries of both the test and the reference samplers. Preliminary experiments with this new system also supported the general validity of the aerosol sampler scaling laws. In addition, they demonstrated high potential that this approach may be applied in a standardised aerosol testing method and protocol.

Fatigue Failure by Flow-Induced Vibration. Effect of Initial Defect Size on Cumulative Fatigue Damage.

The method of fatigue life prediction is presented for structures which suffer from flow-induced vibration. A small wind tunnel was made and used to reproduce fatigue failure by flow-induced vibration. A medium carbon steel specimen attached to a larger styrofoam cylinder was fixed to the experimental equipment. A small artificial hole was introduced onto the specimen surface. Fatigue crack initiated from the artificial hole. A small portable strain histogram recorder (Mini Rainflow Corder, MRC) developed in another project of the authors' team was used to acquire the service strain histogram at a critical point of the specimen and to measure the variation of natural frequency. Fatigue damage D defined by the Modified Miner Rule was calculated by using the strain histogram at the initial stage of the operation of the wind turbine. The values of D were all smaller than 1.0 and ranged approximately from 0.2 to 0.8. The reason for small values of D is explained from the behaviour of small crack growth.

728 流力弾性振動による疲労破壊 : 累積疲労損傷値に及ぼす初期欠陥寸法の影響

The method of fatigue life prediction is presented for structures which suffer from flow-induced vibration. A small wind tunnel was made and used to reproduce fatigue failure by flow-induced vibration. A medium carbon steel specimen attached to a larger styrofoam cylinder was fixed to the experimental equipment. A small artificial hole was introduced onto the specimen surface. Fatigue crack initiated from the artificial hole. A small portable strain histogram recorder (Mini Rainflow Corder, MRC) developed in another project of the authors' team was used to acquire the service strain histogram at a critical point of the specimen and to measure the variation of natural frequency. Fatigue damage D defined by the Modified Miner Rule was calculated by using the strain histogram at the initial stage of the operation of the wind turbine. The values of D were all smaller than 1.0 and ranged approximately from 0.2 to 0.8. The reason for small values of D is explained from the behaviour of small crack growth.

Aspiration efficiency for thin-walled nozzles facing the wind and for very high velocity ratios

The study of thin-walled aerosol sampling probes facing the wind was originally driven by practical applications (e.g., stack sampling). But more recently it has provided useful scientific insights into the performances of more complicated blunt aerosol samplers. Previous work has been carried out for a relatively narrow range of conditions, especially for R (the ratio of freestream air velocity to probe suction velocity), leading to the widely accepted model of Belyaev and Levin (J. Aerosol Sci. 5 (1974) 325). This model has been shown to predict aspiration efficiencies (for sharp-edged, thin-walled samplers facing the wind) that agree well with experimental data, for R ranging from 0.03 to 11. Recently, there has been renewed interest in studying aspiration for a much wider range of R, driven primarily by the desire for a new generation of particle size-selective blunt samplers, including the need to sample at lower flowrates in order to use lighter sampling pumps for industrial hygiene applications. The study of thin-walled sampling for wider ranges of R, especially in the range above about 10 is the first step towards improved understanding of blunt sampling as it might be applied to practical samplers under such conditions. This is because much of what is currently known about the aspiration of aerosols into blunt samplers derives from what is known about the less complex thin-walled sampler configurations. New experiments have been conducted for thin-walled cylindrical sampling probes for R ranging from 0.5 to 50. The experiments were conducted in a small wind tunnel (cross-section 0.30 m×0.30 m) using narrowly graded fused alumina powders to produce aerosols with mass median particle aerodynamic diameters up to 90 μm . The external wind velocity was held constant at 1 m/ s , so that Stokes’ number ( St) ranged from about 0.05 to 3.7. An extensive, highly repeatable set of experimental results showed that, for R increasing above about 6, the Belyaev and Levin model increasingly overestimated aspiration efficiency compared to what was measured. An improved model for aspiration efficiency of thin walled sampling probes facing the wind is proposed that describes what happens over this much wider range of conditions.

Numerical and experimental investigations on the reduction of wind tunnel wall interference by means of adaptive slots

AbstractThe flow in many wind tunnel experiments is affected by the presence of test section walls. The resulting interference can be minimised by correcting the measured model pressures, or by influencing the model flow directly with the use of ventilated or adaptive test section walls. The objective behind the latter technique is to guide the flow in the test section to achieve low interference (i.e. free flow) condition at the model. The most successful technique of flexible, adaptive walls is still restricted to small research wind tunnels due to its mechanical complexity. However, a very promising alternative is the use of adaptive slots in the test section walls. This concept combines the method of passive slotted walls, as they are already implemented in many large wind tunnels, and flexible walls. Additionally, this technique presents the opportunity of full 3D adaptations because the slots can be situated in all four test section walls.This paper presents preliminary experimental results and the latest numerical calculations on the effectiveness of adaptive slots. The experiments were conducted under high subsonic flow conditions in the new slotted test section of the transonic wind tunnel at TU Berlin’s Aeronautical Institute (ILR).The numerical results presented are focussed on the 2D slot adaptation of a 2D-model (CAST7 aerofoil) and the 3D slot adaptation of a body of revolution (3D-ETB). In addition, basic studies were made of the flows associated with a single slot on one wall and a bump on the other.The numerical and the first experimental investigations have shown the potential of adaptive slots to reduce wall interferences effectively. The adaptation accuracy of the investigated slot configurations deviated not more than 3% from the reference case (2D-wall adaptation).

Effect of Adding Alum or Zeolite to Dairy Slurry on Ammonia Volatilization and Chemical Composition

Development of cost-effective amendments for treating dairy slurry has become a critical problem as the number of cows on farms continues to grow and the acreage available for manure spreading continues to shrink. To determine effectiveness and optimal rates of addition of either alum or zeolite to dairy slurry, we measured ammonia emissions and resulting chemical changes in the slurry in response to the addition of amendments at 0.4, 1.0, 2.5, and 6.25% by weight. Ammonia volatilization over 96h was measured with six small wind tunnels with gas scrubbing bottles at the inlets and outlets. Manure samples from the start and end of trials were analyzed for total nitrogen and phosphorus, and were extracted with 0.01 M CaCl2, 1.0 M KCl, and water with the extracts analyzed for ammonium nitrogen, phosphorous, aluminum, and pH. The addition of 6.25% zeolite or 2.5% alum to dairy slurry reduced ammonia emissions by nearly 50 and 60%, respectively. Alum treatment retained ammonia by reducing the slurry pH to 5 or less. In contrast, zeolite, being a cation exchange medium, adsorbed ammonium and reduced dissolved ammonia gas. In addition, alum essentially eliminated soluble phosphorous. Zeolite also reduced soluble phosphorous by over half, but the mechanism for this reduction is unclear. Alum must be carefully added to slurry to avoid effervescence and excess additions, which can increase soluble aluminum in the slurry. The use of alum or zeolites as on-farm amendment to dairy slurry offers the potential for reducing ammonia emissions and soluble phosphorus in dairy slurry.

Methane production by sheep in relation to temporal changes in grazing behaviour

Domesticated ruminant animals are thought to contribute significantly to the global annual emission of methane. CH 4 emission from sheep was measured using a system designed to allow grazing under near-natural conditions in the southwest of the UK. In two studies with mature ewes (5-year-old) methane emissions were measured continuously for up to 8 days in a large polythene tunnel. Small wind-tunnels were used to draw air through the polythene tunnel and a gas chromatograph was used to measure methane concentrations in air entering and in air leaving the tunnel. Air speeds were used to calculate air volume flow through the tunnel, and temperature and humidity were also measured. For periods within these two studies, simultaneous recordings were made of animal behaviour using an automatic system that measured jaw movements; these data provided a continuous record of the time spent by each animal eating, ruminating or idling. Results suggested that the behavioural patterns of sheep within a polytunnel were similar to those found previously for sheep at pasture, although the amount of time spent eating in the tunnel was less. Methane emission rates tended to follow this behavioural pattern with peak emission rates corresponding to peaks in eating activity. Emission rates fell when eating gave way to ruminating. Methane emissions averaged 20.3 l per day per animal, a value similar to previous estimates made using the same system, although methane emissions measured by other workers in open circuit respiration chambers are consistently higher. This experiment helps to explain the animal factors which partly control the contribution that ruminants make to global methane emissions.

PSP measurement of flow fields in a supersonic combustor with a backward-facing step

The mixing fields within a SCRAM-jet combustion chamber are visualized using pressure-sensitive paint (PSP) as an oxygen sensor. The experiments are performed in a small supersonic wind tunnel at the National Aerospace Laboratory - Kakuda Research Center (NAL-KRC). The main stream Mach number is 2.4, and the dynamic pressure ratios between the injected gas and the main flow are 0.3, 0.7, 1.1 and 1.5. Three fuel injection nozzles are used; oxygen is injected from the central nozzle and air from the two nozzles at either side. The spread of the injected gas is measured to observe the effects of placing the nozzles in different positions. The results show that the jet has its own independent flow structure, and that little mixing of gases occurs between the flow structures created by each nozzle. When the injection dynamic pressure ratio is increased, the oxygen fraction rises in the recirculation zone and falls in the separation zone downstream of the injection.

Evaluation of personal aerosol samplers challenged with large particles

The Simplified Test Protocol, developed in our earlier studies for testing personal inhalable aerosol samplers, was evaluated in a specially designed small open-section, close-loop wind tunnel. The sampling efficiencies of three personal inhalable aerosol samplers (IOM, GSP, and Button Aerosol Sampler) were measured with 65 μm particles, using the Simplified Test Protocol at four inlet orientations to the wind ( 0, 90, 180 , and 270°). The results were compared with the data collected from other evaluation approaches. Analysis of variance (ANOVA) has shown that there is no statistically significant difference in the samplers’ performance when they are tested in the small and large wind tunnels following the Simplified Test Protocol and in the large wind tunnel following the conventional approach (samplers on a full-size human manikin). Thus, the Simplified Test Protocol has been shown to be suitable for the performance evaluation of personal inhalable aerosol samplers. The new wind tunnel facility was also found useful for handling very large particles, which is a considerable advantage over traditional wind tunnels. Our new wind tunnel was successfully used to measure the sampling efficiencies of the IOM, GSP, and Button Aerosol Sampler when challenged with particles of up to approximately 250 μm aerodynamic diameter at wind velocities of 50 and 100 cm s −1 . The data show that the sampling efficiency of the IOM sampler depends significantly on the wind velocity and is above 100% for particles of 165 and 241 μm mass median aerodynamic diameter. This dependence is not statistically significant for the GSP and Button Aerosol Sampler, whose sampling efficiencies are similar to each other and do not change with increasing test particle size at the indicated wind velocities. Also, the sampling efficiencies of the GSP and Button Aerosol Sampler closely follow the independent data obtained by using a breathing and rotating manikin at a wind velocity of 100 cm s −1 . The new wind tunnel design is expected to enhance the ability to extend the inhalable convention beyond 100 μm .

Experimental investigation of sonic jet flows for wing/nacelle integration

An experimental study of compressible jet flows has been undertaken in a small transonic wind tunnel. The aim of this investigation was to realize a jet simulator in the framework of wing/nacelle integration research and to characterize the jet flow behavior. First, free jet configuration, and subsequently jet flow in co-flowing air stream configuration were analyzed. Flow conditions were those encountered in a typical flight condition of a generic transport aircraft, i.e. fully expanded sonic jet flows interacting with a compressible external flow field. Conventional experimental techniques were used to investigate the jet flows-Schlieren visualization and two-component Laser Doppler Velocimetry (LDV). The mean and fluctuating properties were measured along the jet centerline and in the symmetric plane at various downstream locations. The results of two configurations show remarkable differences in the mean and fluctuating components and agree well with the trend observed by other investigators. Moreover, these experiments enrich the database for such flow conditions and verify the feasibility of its application in future aerodynamic research of wing/nacelle interactions.