OPTIMUM AIRFOILS AT MODERATE SUPERSONIC SPEEDS. PART 7. BASE DRAG EFFECTS ON THE MAXIMUM LIFT-TO-DRAG RATIO FOR GIVEN ENCLOSED AREA,

Abstract

Maximum lift-to-drag ratio airfoils at moderate supersonic speeds are determined using Ackeret's linear theory for the forebody pressure coefficient and Chapman's experimental results for the base pressure coefficient. The case of given length and enclosed area is investigated for both laminar flow and turbulent flow. It is shown that the maximum lift-to-drag ratio airfoil is identical with the minimum drag airfoil. Furthermore, for turbulent flow and given Mach number and Reynolds number, a critical value of the enclosed area ratio exists. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1968
Accession Number
AD0840092

Entities

People

  • Robert E. Pritchard

Organizations

  • Rice University

Tags

DTIC Thesaurus Topics

  • Base Pressure
  • Coefficients
  • Flow
  • Fluid Dynamics
  • Laminar Flow
  • Mach Number
  • Reynolds Number
  • Turbulent Flow

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Fluid Dynamics.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Flow