Moisture Measurements in a Low Pressure Steam Turbine Using a Laser Light Scattering Probe

[+] Author and Article Information
J. S. Wyler, K. J. Desai

Westinghouse Electric Corp., Steam Turbine Division, Lester, Pa.

J. Eng. Power 100(4), 544-548 (Oct 01, 1978) (5 pages) doi:10.1115/1.3446391 History: Received November 10, 1977; Online July 14, 2010


The paper describes the development of a moisture probe using the principle of laser light attenuation. The probe response was calculated for various droplet sizes and steam conditions. A calibration under known conditions in a special test facility agreed with the predictions for a fog droplet size of 0.2 μm. Using this calibration, measurements were made in a low pressure steam turbine of approximately 500 MW output. Typical distributions of moisture along the blade height are presented.

Copyright © 1978 by ASME
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