Subsonic Performance Potential of Ramjets and Ejector Ramjets

Abstract

A method for analyzing the performance of a ramjet engine at subsonic flight speeds is presented. The absence of a known choked point (M=1) in the engine necessitates an iterative solution. A modified ideal gas analysis is utilized. Considered are the conventional ramjet with liquid fuel injection and an ejector ramjet using vaporized fuel injected into the engine at supersonic velocities. In the latter case, the fuel's momentum is significant and the ejector action draws additional air mass into the engine, which must be considered in the analysis. The method presented compares the two engine cycles at several subsonic flight speeds for both JP-4 and propane fuel. The effects of several levels of component efficiencies are considered.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1972
Accession Number
AD0751317

Entities

People

  • John H. Miller
  • Kenneth A. Watson
  • William E. Supp

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Air Masses
  • Combustion
  • Computer Programming
  • Computer Programs
  • Computers
  • Engines
  • Flight
  • Flight Speeds
  • Ideal Gas Law
  • Mach Number
  • Momentum
  • Physical Properties
  • Ramjet Engines
  • Static Pressure
  • Subsonic Flight

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Combustion science or combustion engineering.
  • Systems Analysis and Design

Technology Areas

  • Hypersonics