Accession Number : AD0714113

Title :   Solutions for a Source-Like Disturbance in a Weakly Nonuniform Potential Flow.

Descriptive Note : Final scientific rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE FLUID DYNAMICS LAB

Personal Author(s) : Landahl,Marten T.

Report Date : MAR 1970

Pagination or Media Count : 31

Abstract : Solutions valid to first order in flow nonuniformity are determined for a source-like infinitesimal disturbance embedded in a two-dimensional or axisymmetric subsonic or supersonic potential flow. A transformation is presented which gives the solutions directly in terms of the familiar ones for a uniform flow. With the aid of parametric differentiation, formally exact solutions are also constructed for a general three-dsional flow, but these are found to be computationally quite unwieldy. An approximation is instead proposed, which is based on the axisymmetric solution and which is found to produce the correct first-order solution in simple cases of flow nonuniformity. The solutions presented are developed primarily for use in calculations of nonlinear flow fields with the method of parametric differentiation, but may also be useful in flow interference problems as well as in the calculation of corrections due to wind tunnel flow imperfections. (Author)

Descriptors :   (*GAS FLOW, PERTURBATION THEORY), FLOW FIELDS, SUPERSONIC FLOW, SUBSONIC FLOW, EQUATIONS OF MOTION, TWO DIMENSIONAL FLOW, AXIALLY SYMMETRIC FLOW, THREE DIMENSIONAL FLOW

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE