Which of these is the linearized perturbation velocity potential equa – McqOptions

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1.	Which of these is the linearized perturbation velocity potential equation over a thin airfoil in a subsonic compressible flow?
A.	β2(ϕxx + ϕyy) = 0
B.	ϕxx + ϕyy = 0
C.	β2ϕxx + ϕyy = 0
D.	β2ϕxx + ϕxy = 0
Answer» D. β2ϕxx + ϕxy = 0

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