The Impact of a Single Wall on the Stability of the Spray Produced by a Gas-Centered Swirl Coaxial Injector

Abstract

Studies of injectors often utilize a single, isolated atomizer. In most applications, however, the atomizer is not isolated but is near one or more walls. It has been established that walls affect the expansion and stability of single-phase jets. Under study here is the effect of a single wall on spray behavior, specifically attachment length, spreading and stability. The atomizer being studied is a gas-centered swirl coaxial injector which relies on a dominant gas flow to drive the atomization. High-speed images are analyzed to assess the spray's behavior both qualitatively and quantitatively. Two different wall offset ratios, 0.83 and 1.16, are compared to the free spray. While both walls spacings affect the spray by reducing the spreading, only the 0.83 spacing shows an ability to stabilize the spray.

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Document Details

Document Type
Technical Report
Publication Date
Mar 15, 2011
Accession Number
ADA546093

Entities

People

  • B. Eilers
  • M. D. Lightfoot
  • Stephen A. Danczyk
  • Stephen Alexander Schumaker
  • V. Narayanan

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Human Systems
  • Materials and Manufacturing Processes
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force Research Laboratories
  • Attachment
  • Barometric Pressure
  • Boundaries
  • Data Processing
  • Engines
  • Flow
  • Flow Rate
  • Gas Flow
  • Hydrophobic Properties
  • Image Processing
  • Injectors
  • Measurement
  • Pressure Gradients
  • Reynolds Number
  • Turbulent Mixing
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Internal Combustion Engine (ICE) Technology.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster