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Thickness dependent variations in surface phosphor thermometry during transient combustion in an HCCI engine

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Author

Summary, in English

Phosphor thermometry is a semi-invasive measurement technique which is commonly used for temperature determination in combustion applications. Surface temperature measurements using thermographic phosphors rely on the assumption that the phosphor layer is thin enough in order to adopt the surface temperature non-intrusively. This work compares the temperature information, recorded from two opposing sides of phosphor films, coated on a translucent part of the combustion chamber wall inside a car engine. The film thickness was varied between 5 and 72 mu m and two different phosphors were studied; CdWO4 and La2O2S:Eu. For both phosphors, the results showed no significant differences. Being subject to unsteady heat transfer during fired engine operation, phosphor coatings above 20 mu m in thickness experienced a significant temperature gradient between the front- and the backside of the coating, whereas thinner layers did not seem to be affected within the limits of measurement accuracy and precision. Cycle-to-cycle variations of the global gas temperature were not found to correlate with phosphor temperature variations. However, a strong temperature correlation between opposite sides of the phosphor coating was observed for film thicknesses below 20 mu m during engine cycle-to-cycle variations. (C) 2013 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Publishing year

2013

Language

English

Pages

1466-1475

Publication/Series

Combustion and Flame

Volume

160

Issue

8

Document type

Journal article

Publisher

Elsevier

Topic

  • Other Mechanical Engineering
  • Atom and Molecular Physics and Optics

Keywords

  • Laser-induced phosphorescence
  • Thermographic phosphor
  • Surface
  • thermometry
  • Film thickness
  • Thermal boundary layer
  • Internal combustion
  • engine

Status

Published

ISBN/ISSN/Other

  • ISSN: 0010-2180