Date of Award
Summer 1974
Document Type
Thesis
Department
Mechanical & Aerospace Engineering
Program/Concentration
Mechanical Engineering
Committee Director
S. N. Tiwari
Committee Member
I. E. Beckwith
Committee Member
A. S. Roberts
Call Number for Print
Special Collections; LD4331.E56B47
Abstract
A theoretical investigation at Mach 6 and 8 has been conducted on a model of a wind tunnel sound shield. The flat plate model consists of interchangeable circular and wedge shaped longitudinal rods with gaps between the rods for boundary layer removal. One dimensional gas dynamics results have been applied to model the pressure distribution for the array of cylinders. Comparisons with experimental pressure distributions and numerical potential flow solutions indicate good agreement. It has been demonstrated that stagnation line heat transfer can be accurately predicted for laminar and-turbulent flow for circular cylinders. The flow around the wedge rods was apparently disturbed and hence no truly laminar or turbulent data were obtained. In view of the large effective0sweep angle of the circular rods with respect to the local flow (89), boundary layer behavior was surprisingly well represented by swept cylinder theory. A study of transition data indicates laminar flow was maintained up to a local diameter Reynolds number of 1.5 x 10 which is in agreement with results for isolated swept cylinders. Measurements by NASA - Langley staff indicate considerable noise reductions in the shielded region. Thus the model is apparently a viable sound shield.
Rights
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DOI
10.25777/87xc-9427
Recommended Citation
Berger, Michael H..
"Application of Boundary Layer Theory to Suction Through Streamwise Slots in Wind Tunnel Walls"
(1974). Thesis, Old Dominion University, DOI: 10.25777/87xc-9427
https://digitalcommons.odu.edu/mae_etds/404