2 edition of Experimental aerodynamic and acoustic model testing of the variable cycle engine (VCE) testbed coannular exhaust nozzlesystem found in the catalog.
Experimental aerodynamic and acoustic model testing of the variable cycle engine (VCE) testbed coannular exhaust nozzlesystem
D. P. Nelson
|Statement||by D.P. Nelson and P.M. Morris.|
|Series||Contractor reports / National Aeronautics and Space Administration -- no.159710|
|Contributions||Morris, P. M.|
scale model testing • Moving belt and rotating wheels • Testing at Lola Cars, UK • Tractor & semitrailer model with high level of detailing – Cooling air-flow and underhood simulation – Almost complete representation of chassis parts – Model made from aluminium/steel spine, foam blocks, STL and carbon fibre parts. Experimental aerodynamics at Scania • Full scale testing (aerodynamics & aeroacoustics) at DNW • scale model testing (moving ground) at Lola Cars • Test track is used for aero-acoustics and soiling tests.
Automotive seats play a vital role for improving the overall sound absorption inside the vehicle. To understand the acoustic performance of automotive seats in the passenger compartment of a vehicle, various types of seat assemblies were tested by the reverberation chamber method as per ASTM C TCited by: 2. Being a continuous subject of research, this study presents new aspects regarding the relevance of underbody diffusers in road vehicle aerodynamics. Using a generic car model on wheels as a reference, the effect of the wheels on the body fitted with an underbody diffuser was studied, where the diffuser length and angle were varied within ranges which are applicable for Cited by: 8.
A model for prediction of effects of pressure, crossflow velocity, and heat of explosion on double-base propellant burning rate Acoustic and emission results from the Pratt and Whitney Aircraft Variable Cycle Engine Program. J. WESTMORELAND and Aerodynamic and acoustic behavior of a YF inlet at static conditions. Thrust reversal, also called reverse thrust, is the temporary diversion of an aircraft engine's thrust so that it acts against the forward travel of the aircraft, providing reverser systems are featured on many jet aircraft to help slow down just after touch-down, reducing wear on the brakes and enabling shorter landing distances.
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-acoustic measures used in voice assessments may include: fundamental frequency (Fo reported in Hz), frequency range, average intensity during conversation (reported in dB), phonetogram (aka voice range profile), additional computer based measures (jitter, shimmer, tremor frequency).
Experimental Aerodynamics Scaling •!Two flows are equivalent as long as all the relevant scale parameters are equal. •!In practice it is nearly impossible to enforce all the scale parameters to be equal •!Consider the following examples: –!Air flow over a real bridge deck with width of 30m and over a model of the bridge deck with width File Size: 1MB.
Thrust and acoustic measurements for the quadcopter were performed simultaneously in the Virginia Tech anechoic chamber, designed by Eckel Industries.
The chamber is fully anechoic providing a low frequency cut-off of Hz and has interior. Experimental Aerodynamics provides an up to date study of this key area of aeronautical engineering.
The field has undergone significant evolution with the development of 3D techniques, data processing methods, and the conjugation of simultaneous measurements of Format: Hardcover. An experimental study of bicycle aerodynamics Article (PDF Available) in International Journal of Mechanical and Materials Engineering 6(2) August with 1, Reads.
An aerodynamic and acoustic study was made of a pusher-propeller aircraft model in the NASA Ames Research Center 7-by Foot Wind Tunnel. The test sec-tion was modified to operate as an open jet. The mm diameter unswept propeller was operated alone and in the wake of three empennages--an I-tail, a Y-tail, and a Size: 2MB.
In this paper, an experimental study on the aerodynamic characteristics of a variable span wing flying inside a channel guideway is accomplished using wind tunnel testing. A variable. The experimental setup is then discussed and the test matrix is described. The finite element model is then presented.
The accuracy of the modeling tool is assessed by comparing predictions with measurements, and finally conclusions are made concerning the applicability of the tool for acoustic engine liner simulations. Experimental SetupFile Size: 1MB. For measuring the various aerodynamic force acting over the surface of the scaled model, 3mm drill is done on it, and mm copper tube is attached in hole.
The test model is reduced to a geometric shape by neglecting wheels gap, mirror, etc to isolate the performance from any other aerodynamic influences.
Fig Car model with pressure tapping. Experimental Aerodynamics Some testing procedures •!There are hundreds of different testing procedures that can be employed in a wind tunnel. •!The choice of procedure depends on the test objectives, the model, the wind tunnel, the instrumentation etc.
•!In this lecture, several additional procedures will be introduced:File Size: 2MB. Advanced Experimental Methods for the Analysis and Aerodynamic Design of Heavy Vehicles Mike Camosy and Gaylord Couthier Auto Research Center LLC details to study flows in the engine compartment and the underbody of the tractor and the NASA generic model and a more representative truck model.
The testing included parts which are. The paper will describe comparative assessment of aerodynamic performance of two different popular hatchback and sedan car model by two distinct experimental strategies of aerodynamic predictions by conventional wind tunnel approach and its subsequent validation with advanced computational procedures, carried out on two popular model of sedan andFile Size: KB.
EXPERIMENTAL STUDY O 1 Abstract This paper addresses the use of piezo-electric driven synthetic jet actuators as aerody-namic load control device in a 2D wing wind-tunnel model with a NACA airfoil section with a chord of m.
Synthetic jets can be integrated in for instance wings and wind tur. General NASA must continue to provide the necessary resources for aerodynamics research and validation, including resources focused on specific key technologies, resources to maintain and enhance ground and flight test facilities, and resources for enhanced analytical and design capabilities.
Specific. The following research topics should serve as the focus of NASA's. Part a) Different methods of evaluation of vehicle aerodynamics: In recent years aerodynamics of vehicle has gained a lots of attention because of the major use of negative lift (down force) principle which improves the performance of vehicles.
The main focus of the present work is to study the aerodynamic noise generated by fans used for cooling electric motors. The sketch shown in Fig. 1 demonstrates this type of fan which exhibits the characteristics of centrifugal, mixed and axial fans.
The dashed line of Fig. 1 indicates the direction of air flow. The fan inlet flow direction is axial and continues in this direction until the Cited by: 4. Lectures on Experimental Aerodynamics. The lectures attempt to provide an overview of image-based aerodynamics measurement techniques and their applications for students and researchers.
The presented materials include the research results obtained by the WMU group and collaborators in other institutions. This paper established a computational model for the flow field of landing gear and extracted the velocity and vorticity distribution of flow field. A lot of shedding vortexes presented around the torque arm and pillar of landing gear and had the greatest impact on the flow field around the landing gear.
Then, the aerodynamic noise of landing gear was measured in an anechoic Author: Yao-ming Zhou, Yao-long Liu, Shao-wei Li, Dao-chun Li, Yu-hong Jia. experimental aerodynamic analysis on a typical car model for the estimation of drag force and pressure distribution characteristics in the mid plane of the car model using realizable (k- ε) model and 64 channel pressure scanner.
The authors concluded that the obtained drag coefficient by means of computationalCited by: 1. The interferences the engine exhaust jets by at the take-off and landing flight conditions were focused on the first step of these issues.
In this research, the low speed wind tests tunnel were conducted on model where the engine a exhaust was simulated. The objectives of this. EXPERIMENTAL RESEARCH FOR AERODYNAMIC. A sketch of the rod–airfoil test model and the set-up is shown in Fig. 1.A symmetric NACA airfoil with chord length of C= mm is located downstream of a rod, both extending by mm in the spanwise airfoil chord is aligned with the centre of the nozzle and parallel to the streamwise origin of the Cartesian coordinate system is located at the mid Cited by: 1.
Then, the GEM3D models of the air box and charge air cooler are discussed, along with the compressor acoustic model. The transmission loss of the air box is compared with experimental data. The predicted sound at the 2 nd and 4 th engine orders is compared with measurements, which shows reasonable by: 1.Development of a small air vehicle based on aerodynamic model analysis in the tunnel tests, Mechatronics, 16 () 10 Garry Kevin P, Wind tunnel tests on the influence of fixed ground board length on the aerodynamic characteristics of simple commercial vehicle models, J Wind Eng Ind.
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