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Stability of a non-orthogonal stagnation flow to three dimensional disturbancesA similarity solution for a low Mach number nonorthogonal flow impinging on a hot or cold plate is presented. For the constant density case, it is known that the stagnation point shifts in the direction of the incoming flow and that this shift increases as the angle of attack decreases. When the effects of density variations are included, a critical plate temperature exists; above this temperature the stagnation point shifts away from the incoming stream as the angle is decreased. This flow field is believed to have application to the reattachment zone of certain separated flows or to a lifting body at a high angle of attack. Finally, the stability of this nonorthogonal flow to self similar, 3-D disturbances is examined. Stability properties of the flow are given as a function of the parameters of this study; ratio of the plate temperature to that of the outer potential flow and angle of attack. In particular, it is shown that the angle of attack can be scaled out by a suitable definition of an equivalent wavenumber and temporal growth rate, and the stability problem for the nonorthogonal case is identical to the stability problem for the orthogonal case.
Document ID
19910018187
Document Type
Contractor Report (CR)
Authors
Lasseigne, D. G. (Old Dominion Univ. Norfolk, VA., United States)
Jackson, T. L. (Old Dominion Univ. Norfolk, VA., United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1991
Subject Category
FLUID MECHANICS AND HEAT TRANSFER
Report/Patent Number
NAS 1.26:187591
NASA-CR-187591
ICASE-91-51
AD-A239522
Funding Number(s)
PROJECT: RTOP 505-90-52-01
CONTRACT_GRANT: NAS1-18605
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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