Accession Number : AD0738638

Title :   Berechnung der laminaren Zweistoff-Grenzschicht in der Hypersonischen Staupunktstroemung mit Temperaturabhaengigen Stoffbeiwerten (Calculation of a Laminar Binary-Mixture Boundary Layer in Hypersonic Stagnation Point Flow with Temperature-Dependent Additive Gases),

Corporate Author : DEUTSCHE FORSCHUNGS- UND VERSUCHSANSTALT FUER LUFT- UND RAUMFAHRT E V BRUNSWICK (WEST GERMANY)

Personal Author(s) : Steinheuer,J.

Report Date : 12 MAY 1970

Pagination or Media Count : 16

Abstract : An exact and an approximate method are presented for the calculation of a laminar binary-mixture boundary layer for the plane or axisymmetric stagnation point flow at hypersonic velocity with foreign gas injection. In the exact method the property parameters of the binary gas mixture, i.e. viscosity, thermal conductivity and binary diffusion coefficient as well as density and specific heat capacity must be known as functions of temperature and foreign gas concentration. The approximate method utilizes only the wall-values of these property parameters in conjunction with their mean gradients over the boundary layer thickness. The boundary layer equations form a system of three coupled ordinary differential equations for the stream function, the concentration, and the enthalpy. In the exact method these equations are transformed into a system of integral equations which is solved by an iterative procedure. In the approximate method the boundary layer equations are reduced to their incompressible form. In addition, the asymptotic limit of strong injection is investigated. Numerical examples of calculation for the different methods are presented. (Author)

Descriptors :   (*FLUID MECHANICS, WEST GERMANY), LAMINAR BOUNDARY LAYER, STAGNATION POINT, GAS FLOW, HYPERSONIC CHARACTERISTICS, THERMAL PROPERTIES, EQUATIONS OF MOTION, APPROXIMATION(MATHEMATICS)

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE