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An Introduction to Compressible Flow by Forrest E. Ames

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CHAPTER 5

AN INTRODUCTION TO PRANDTL–MEYER FLOW

In Chapter 3, normal shock equations were developed from the principles of conservation of mass, conservation of energy, and the momentum principle in combination with the ideal gas law and equation for the speed of sound. The analysis demonstrated that a normal shock wave results in a total pressure loss in the flow stream. In the discussion of normal shocks, it was apparent that compression waves could reinforce one another, while expansion waves could not. Moreover, a discrete expansion shock would violate the second law of thermodynamics, as it would result in an increase in the total pressure. When sonic or supersonic flow encounters a sudden change in direction through a convex corner, the ...

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