Accession Number : ADA134843

Title :   Variable Area Ejector-Diffuser Model Tests.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Walsh,T H

PDF Url : ADA134843

Report Date : Sep 1983

Pagination or Media Count : 122

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.

Descriptors :   *Supersonic diffusers, *Air ejectors, *Gas turbines, Afterburners, Thermocouples, Turbofan engines, Duct inlets, Mass flow, Theses

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE