1 model testing and drag reduction technique asi bunyajitradulya (abj) 2145-392 aerospace...
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Model Testing and Drag Reduction Technique
Asi Bunyajitradulya (ABJ)
2145-392 Aerospace Engineering Laboratory II
![Page 2: 1 Model Testing and Drag Reduction Technique Asi Bunyajitradulya (ABJ) 2145-392 Aerospace Engineering Laboratory II](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649e895503460f94b8e925/html5/thumbnails/2.jpg)
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In the design and development of engineering equipment:
Need certain data,
Not economical to build and test a life-size equipment right from the beginning,
Computer-Aided-Design/Engineering (CAD/CAE) helps in the initial design stage,
but it still requires verification from the testing.
Motivation
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Have you ever wonder?
From http://www.windtunnels.arc.nasa.gov/pics/12FT/12t2 From http://www.boeing.com
Model testing
Lift ~ O(100 N)
Real thing
Lift ~ O(100 tons)
?
Have you ever wonder how we can do that?
![Page 4: 1 Model Testing and Drag Reduction Technique Asi Bunyajitradulya (ABJ) 2145-392 Aerospace Engineering Laboratory II](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649e895503460f94b8e925/html5/thumbnails/4.jpg)
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How can we estimate the performance (e.g., lift and drag) of a life-size prototype with
the testing of a scaled model?
What underlying principle allows us to test a scaled-model and use the resulting data
to estimate the performance of a life-size prototype?
Dimensional analysis
Buckingham’s PI Theorem
Similarity
Background
Model Testing
![Page 5: 1 Model Testing and Drag Reduction Technique Asi Bunyajitradulya (ABJ) 2145-392 Aerospace Engineering Laboratory II](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649e895503460f94b8e925/html5/thumbnails/5.jpg)
Flow Visualization of Flow Past Delta Wing in A Wind Tunnel
![Page 6: 1 Model Testing and Drag Reduction Technique Asi Bunyajitradulya (ABJ) 2145-392 Aerospace Engineering Laboratory II](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649e895503460f94b8e925/html5/thumbnails/6.jpg)
Flow Visualization of Flow Past Delta Wing in A Wind Tunnel
![Page 7: 1 Model Testing and Drag Reduction Technique Asi Bunyajitradulya (ABJ) 2145-392 Aerospace Engineering Laboratory II](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649e895503460f94b8e925/html5/thumbnails/7.jpg)
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Lift and Drag, and Cl and Cd of An Airfoil,Dimensional Analysis and Model Testing
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Drag and Drag Reduction Technique
From Van Dyke, M., 1982, An Album of Fluid Motion, Parabolic Press, Stanford.
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Drag and Drag Reduction Technique
From Van Dyke, M., 1982, An Album of Fluid Motion, Parabolic Press, Stanford.
![Page 10: 1 Model Testing and Drag Reduction Technique Asi Bunyajitradulya (ABJ) 2145-392 Aerospace Engineering Laboratory II](https://reader036.vdocuments.us/reader036/viewer/2022062517/56649e895503460f94b8e925/html5/thumbnails/10.jpg)
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Objectives
Investigate a drag reduction technique: e.g., trip wire technique
More specifically
Objective functional form:
V
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);;(
defc
cpxfy
d