Scaling of Gas-Centered Swirl-Coaxial Injectors

Abstract

Robust design criteria and scaling for gas-centered swirl-coaxial (GCSC) injectors remain unclear despite much recent interest in using these injectors for LOX-hydrocarbon rocket engines. (The oxidizer is actually introduced as gas in the main-chamber injector.) A study of the behavior of the atomizing film in a GCSC injector has been undertaken as part of the development of improved design criteria. Using laser-sheet illumination the length of the film has been determined over a range of operating conditions and injector geometries. Experiments are performed using water and nitrogen as working fluids. Results show that the average film length relates to the momentum flux ratio and that the change in length per change in momentum flux ratio decreases at higher the momentum flux ratios. Such behavior is predicted from models of the injector.

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Document Details

Document Type
Technical Report
Publication Date
Oct 14, 2008
Accession Number
ADA502809

Entities

People

  • Douglas G. Talley
  • Malissa D. Lightfoot
  • Stephen A. Danczyk

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Aerodynamic Forces
  • Air Force Research Laboratories
  • Design Criteria
  • Flow
  • Flow Rate
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Froude Number
  • Gas Flow
  • Geometry
  • Image Processing
  • Mass
  • Mass Flow
  • Rocket Engines
  • Spatial Distribution
  • Standards

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Internal Combustion Engine (ICE) Technology.

Technology Areas

  • Directed Energy