Accession Number : AD0702104

Title :   PREDICTION OF SUPERSONIC LAMINAR FLOW SEPARATION BY THE METHOD OF INTEGRAL RELATIONS WITH FREE INTERACTION.

Descriptive Note : Technical rept. 20 May 68-Jul 69,

Corporate Author : NIELSEN ENGINEERING AND RESEARCH INC PALO ALTO CALIF

Personal Author(s) : Kuhn,Gary D. ; Goodwin,Frederick K. ; Nielsen,Jack N.

Report Date : JAN 1970

Pagination or Media Count : 104

Abstract : The report describes the development of a predictive method for calculating separated laminar boundary layers on flat-plate-wedge and cylinder-flare configurations in supersonic flow and the application of the method to predicting the effects of Mach number, Reynolds number, and temperature ratio on the properties of the boundary layer. The purpose of the report is to extend previous analytical work employing the method of integral relations to the region downstream of reattachment and to describe an interative technique developed to produce a unique solution. The theory is shown to produce good comparisons with pressure data on flat-plate-wedge configurations for both adiabatic and cold walls. Accounting for non-Blasius initial velocity profiles produced by favorable pressure gradients upstream of the beginning of interaction was shown to decrease the predicted extent of separation. For axisymmetric configurations the length of an equivalent cylinder must be calculated by an auxiliary method. Good to fair comparisons with experimental pressure distributions were produced by adjusting the equivalent cylinder length. Fair comparison was produced between the theory and experimental heat-transfer rate data on an ogive-cylinder-flare configuration. The theory is shown to predict an incipient separation wedge angle which agrees reasonably well with experimental results. (Author)

Descriptors :   (*LAMINAR BOUNDARY LAYER, SUPERSONIC CHARACTERISTICS), (*FLOW SEPARATION, SUPERSONIC CHARACTERISTICS), MATHEMATICAL PREDICTION, FLAT PLATE MODELS, WEDGES, CYLINDRICAL BODIES, MACH NUMBER, REYNOLDS NUMBER, INTERACTIONS, PRESSURE, INTEGRAL EQUATIONS

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE