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Unformatted text preview: 1 SP-367 Introduction to the Aerodynamics of Flight 1. V. TRANSONIC FLOW. [ 103 ] Up to this point the airplane was considered to be in motion at subsonic speeds. The air was treated as though it were incompressible and a study of the aerodynamics involved using this simplifying assumption was made. As the airplane speed increases, however, the air loses its assumed incompressibility and the error in estimating, for example, drag, becomes greater and greater. The question arises as to how test an airplane must be moving before one must take into account compressibility. One important quantity which is an indicator is the speed of sound of the air through which the airplane is flying. A disturbance in the air will send pressure pulses or waves out into the air at the speed of sound. Consider the instance of a cannon fired at sea level. An observer situated of sound....
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This note was uploaded on 04/22/2008 for the course AERODYNAMI 201 taught by Professor Oleis during the Spring '08 term at Delta State.
- Spring '08