Analysis and Design of Ejector Diffuser for Optimum Thrust,

Abstract

Recent advances in jet ejectors operating under static conditions have produced high thrust augmentation that is feasible for application to V/STOL flight. However, because of (a) loss in augmentation in duct flow, (b) ramjet effect, and (c) space limitations, high performance and compactness are required in the design of thrust-augmenting ejectors for V/STOL aircraft. An analytical inverse approach is presented in which the pressure distribution along the diffuser wall of an ejector is defined for a given entrance flow condition and the contour of the desired diffuser wall is determined by using a finite difference technique. The prescribed pressure distribution is first optimized by a modified Stratford criterion for incipient separation of turbulent boundary layers; this optimization makes it applicable to compressible two-dimensional and axisymmetric flows.

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1976
Accession Number
ADA025491

Entities

People

  • David W Taylor
  • Tsze C. Tai

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Axisymmetric Flow
  • Boundaries
  • Boundary Layer
  • Diffusers
  • Flow
  • Layers
  • Pressure Distribution
  • Short Takeoff Aircraft
  • Thrust
  • Thrust Augmentation
  • Turbulent Boundary Layer
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Fluid Mechanics and Fluid Dynamics.
  • Systems Analysis and Design

Technology Areas

  • Space
  • Space - Hall-Effect Thruster