Accession Number : ADA131634

Title :   Improved Wave Drag Predictions Using Modified Linear Theory.

Descriptive Note : Final technical rept. 7 Dec 81-7 Dec 82,

Corporate Author : VOUGHT CORP DALLAS TX

Personal Author(s) : Stancil,R T

PDF Url : ADA131634

Report Date : 07 Dec 1982

Pagination or Media Count : 85

Abstract : The wave drag prediction method is based on a modified supersonic linear theory computer technique. The modified linear theory differs from ordinary linear theory in that it uses the exact, boundary condition, it uses th exact pressure coefficient equation, and it uses characteristic tracing to determine regions of influence. The theoretical and numerical techniques are described in detail. A computer user's manual is included which provides a detailed description of the inputs and outputs of the computer routine, including recommended guidelines for preparing the geometric input. Comparisons between predictions of drag or pressures using the modified linear theory are made for five cases with wind tunnel data or other theories. These comparisons verify the improved accuracy of the modified linear theory relative to ordinary linear theory, particularly for high Mach numbers and high surface slopes.

Descriptors :   *Supersonic drag, Mathematical prediction, Wave equations, Slender bodies, Wind tunnel tests, Wing body configurations, Noses, Boundary value problems, Computerized simulation, Interactive graphics

Subject Categories : Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE