A New Quantitative 3D Imaging Method for Characterizing Spray in the Near-field of Nozzle Exits

Abstract

To assist in the development of more accurate models and understanding of liquid atomization, we have developed a new quantitative measurement technique to examine the dense near-field region of sprays using X-ray computed tomography (CT). An optimized spray CT system was designed using a modern conventional flat-panel tabletop conebeam X-ray CT with recommendations for further improvements in spatial resolution. Three-dimensional time-averaged liquid mass distributions have been obtained for scaled pressure swirl atomizers, which match the dimensionless parameters for typical spray application. The results reveal three-dimensional characteristics of nominally axisymmetric sprays and provide quantitative evaluation data for high-fidelity simulations. Furthermore, preliminarily comparisons have been made to standard optical measurements techniques such as Shadowgraphy and PLIF as validation.

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Document Details

Document Type
Technical Report
Publication Date
Jan 13, 2015
Accession Number
ADA623372

Entities

People

  • Jon Eaton
  • Michael Benson
  • Pablo A. Vasquez Guzman
  • Rebecca Fahrig

Organizations

  • Stanford University

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • Human Systems

DTIC Thesaurus Topics

  • Dermatologic Agents
  • Detectors
  • Engineering
  • Geometry
  • Imaging Techniques
  • Laser Induced Fluorescence
  • Measurement
  • Mechanical Engineering
  • Near Field
  • Physical Properties
  • Students
  • Three Dimensional
  • Tomography
  • Two Dimensional
  • X Ray Tubes
  • X Rays
  • X-Ray Computed Tomography

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Computational Fluid Dynamics (CFD)
  • Medical Imaging.