Question

(a) Calculate the sound speed value in both units at 20,000 ft altitude in standard atmosphere. (b) Calculate the Reynolds number of a transport aircraft (i.e. A321neo) cruises at Mach number M-0.78 at 30,000 ft altitude. Determine its probable flow behavior such as laminar or turbulent, unsteady or steady, viscous or inviscid, etc (c) Choose the most suitable governing equations and boundary conditions if we want to compute the lift/drag ratio for this aircraft under the above cruise conditions in calm weather, discuss its limitations.

Answer 1

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