Accession Number:

AD0687059

Title:

INVESTIGATION OF THE WAKE BEHIND A BODY FLYING AT SUPERSONIC SPEED,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1968-12-18

Pagination or Media Count:

18.0

Abstract:

A state-of-the-art report and critique of base flow and base pressure research in the wake at supersonic speeds is given. Classical and modern experiments Crocco-Lees, Chapman, Bogdanov, Charwat, et al are tabulated, and hypotheses are analyzed. The discrepancies, inconsistencies and contradictions contained in various theories are pointed out. The problem of base pressure is closely related to the dynamics of the flow boundary of the wake behind the body, and to the effects of the boundary layer which is separated from the trailing edge upon the mixing process. The overall state-of-the-art indicates that the laws of base flow are not sufficiently researched, and not enough experimental data is available to verify, or disprove, some of the available hypotheses. The following are some of the areas that require additional investigation 1 Distribution of the velocities, pressures and temperature in the reflux 2 Structure of the flow boundary in the wake for a plane and three-dimensional case, for both laminar and turbulent mixing 3 The effect of the geometric characteristics of the body upon the base flow 4 Mass and heat exchange phenomena 5 Heat exchange at the base at various conditions of circumfluence 6 Turbulent mixing coefficient in supersonic flows in general, and in non-isothermic and isobaric flows in particular. Author

Subject Categories:

  • Aerodynamics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE