Use of Proper Orthogonal Decomposition Towards Time-resolved Image Analysis of Sprays

Abstract

High-speed movies of optically dense sprays exiting a Gas-Centered Swirl Coaxial (GCSC) injector are subjected to image analysis to determine spray characteristics. As a test for its efficacy in analysis of high-optical-density sprays, Proper Orthogonal Decomposition (POD) was applied to the image sequence prior to image analysis. Results of spray morphology including spray boundary, widths, angles and boundary oscillation frequencies, are compared with and without the application of POD. The most dominant modal reconstructions (between 2 and 5) of the spray are found to be sufficient to quantitatively describe the spray parameters, while the frequency of movement of the spray boundary is well predicted by the first two modes alone. Despite being computationally intensive, preprocessing of spray images using POD has advantages in - a) reduction of droplet noise in the spray boundaries thereby resulting in a smoother boundary for edge detection, and b) ability to process morphological parameters of ill-behaved sprays.

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Document Details

Document Type
Technical Report
Publication Date
Mar 15, 2011
Accession Number
ADA546120

Entities

People

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

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Boundaries
  • Change Detection
  • Data Analysis
  • Data Processing
  • Decomposition
  • Detection
  • Flow Rate
  • Frequency
  • Image Processing
  • Injectors
  • Mass Flow
  • Measurement
  • Oscillation
  • Preprocessing
  • Sequences

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Image Processing and Computer Vision.
  • Internal Combustion Engine (ICE) Technology.