Which of these is the linearized perturbation velocity potential equat – 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.	<sup>2</sup>( <sub>xx</sub> + <sub>yy</sub>) = 0
B.	<sub>xx</sub> + <sub>yy</sub> = 0
C.	<sup>2</sup> <sub>xx</sub> + <sub>yy</sub> = 0
D.	<sup>2</sup> <sub>xx</sub> + <sub>xy</sub> = 0
Answer» D. <sup>2</sup> <sub>xx</sub> + <sub>xy</sub> = 0

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