Decay of Boundary Layer Turbulence in the Near Wake Expansion Region of a Slender Body.

Abstract

A theoretical study of the decay of the fluctuating velocities in the supersonic near wake expansion of boundary layer turbulence is presented. A model based on linear theories is utilized to predict the change in fluctuation levels and turbulent scale sizes. The effect of the compressibility of the mean flow is included, and mean properties are calculated from method of characteristics solutions. The validity of linear theory is examined, and an analysis of the decay of eddy turbulence associated with the vorticity field is presented. Results indicate that the decay rate is strongly dependent upon proper specification of the anisotropic boundary layer turbulence. Results consistent with data for the turbulence decay in the near wake of a slender wedge are obtained when a realistic choice of boundary layer integral scales and velocity fluctuation levels is made. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1971
Accession Number
AD0885291

Entities

People

  • Anthony N. Pirri

Tags

DTIC Thesaurus Topics

  • Bodies
  • Boundaries
  • Boundary Layer
  • Compressive Properties
  • Integrals
  • Layers
  • Method Of Characteristics
  • Slender Bodies
  • Specifications
  • Turbulence

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Boundary Layers
  • Hypersonics - Hypersonic Flow