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Pulsed LED Photography for Coarse Water Characterisation

[+] Author Affiliations
Kris Vernon, Tim Rice

Alstom Power Ltd, Rugby, UK

David Hann

University of Nottingham, Nottingham, UK

Paper No. GT2014-25401, pp. V01BT27A010; 11 pages
doi:10.1115/GT2014-25401
From:
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 1B: Marine; Microturbines, Turbochargers and Small Turbomachines; Steam Turbines
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4558-5
  • Copyright © 2014 by ASME and Alstom Technologie AG

abstract

An optical photography probe employing pulsed LED illumination has been developed for application to coarse water measurement in wet steam. High image resolution (1.38μm/px) and low exposure time (100ns) photographs capture details of micro-dynamic flow features with reduced motion blur. Camera and lens are held inside a 50mm O.D. cylindrical tube, with a custom designed titanium probe head allowing purging air to clear the front optical surface of stagnant liquid. Double exposure images are analyzed using standard image processing techniques to extract the size and velocity of liquid droplets. The accuracy and repeatability of the measurement probe has been verified on air-water sprays with direct comparison to Phase-Doppler Anemometry measurements, which show good agreement.

Copyright © 2014 by ASME and Alstom Technologie AG
Topics: Water

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