Accession Number : ADA017684

Title :   Transition to Transonic Flow in the Far Field for a Supersonic Airfoil in a Stratified Atmosphere.

Descriptive Note : Interim rept.,

Corporate Author : WASHINGTON UNIV SEATTLE DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : Pechuzal,Georges A.

Report Date : SEP 1975

Pagination or Media Count : 118

Abstract : This paper deals with the steady frictionless, nonheat-conducting flow field of a thin airfoil in an atmosphere with a weak wind gradient. Because of this wind gradient, which is assumed to increase linearly with altitude, the flow gradually becomes transonic in the far field below the airfoil. This transition phenomenon also occurs in an atmosphere where the temperature decreases with altitude, and for certain cases of accelerating flights. In all these models, it is shown that a solution which describes both supersonic and transonic regimes can be derived by matching two expansions. The flow field in the transonic region is then calculated numerically using the method of characteristics and incorporating the appropriate shock relations.

Descriptors :   *Boundary layer transition, *Transonic characteristics, *Supersonic airfoils, Atmospheric physics, Stratification, Wind, Far field, Flow fields, Mathematical models, Temperature, Numerical methods and procedures, Shock waves, Method of characteristics

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE