Accession Number:

ADA025491

Title:

Analysis and Design of Ejector Diffuser for Optimum Thrust,

Descriptive Note:

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD AVIATION AND SURFACE EFFECTS DEPT

Personal Author(s):

Report Date:

1976-03-01

Pagination or Media Count:

31.0

Abstract:

Recent advances in jet ejectors operating under static conditions have produced high thrust augmentation that is feasible for application to VSTOL 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 VSTOL 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.

Subject Categories:

  • Fluid Mechanics
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE