Variable Area Ejector-Diffuser Model Tests.

Abstract

A modular variable area ejector-diffuser was constructed and tested to establish baseline characteristics that could be used for comparison of results obtained from potential geometric reconfiguration. F404 and TF30 engines (afterburning and non-afterburning modes) were modeled with a scale factor of 22.1. The diffuser-ejector had a cylindrical inlet duct (3.47 inch dia.) which transitioned at an L/D of 1.33 to a conical section with a half angle of 8 degrees for an overall length of 24.0 inches, and with a transplanting centerbody composed of four conical sections with differing includes angles. Maximum primary mass flow and total pressure for the F404 without afterburner (smallest engine modeled) were 0.43 lbm/sec. and 2.95 atmospheres. These same parameters for the TF30 with afterburner (largest engine modeled) were 1.74 lbm/sec. and 2.57 atmospheres.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1983
Accession Number
ADA134843

Entities

People

  • T. H. Walsh

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Afterburning
  • Air Supplies
  • Barometric Pressure
  • Computational Fluid Dynamics
  • Computer Programs
  • Computers
  • Data Acquisition
  • Diffusers
  • Engineering
  • Mach Number
  • Measurement
  • Mechanical Engineering
  • Operating Systems
  • Pressure Distribution
  • Test Facilities
  • Transducers
  • Turbines

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.

Technology Areas

  • Biotechnology