An infinite-line probe is commonly used to measure unsteady pressure in high-temperature environments while protecting the pressure transducer. In this study, an existing theoretical model is used to derive the response of a waveguide pressure measuring system. An ambient temperature centrifugal compressor rig acts as an experimental source of fluctuating pressure. The compressor is operated at different discrete rotational speeds, and the blade-passing frequencies are used to obtain frequency response data. In the experiments, pressure waves attenuated at a rate faster than that predicted by the theoretical model for a 0.322 m (12 in.) sensor offset. Furthermore, the decay in the magnitude of the pressure oscillations accelerated at blade-passing frequencies above 9 kHz. A unique contribution of this study is to show that whereas the experimentally observed overall attenuation is broadly consistent with the theoretical predictions, pressure oscillations corresponding to individual blade passages may be disproportionally attenuated.
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e-mail: maw@gatech.edu
e-mail: m.dhingra@gatech.edu
e-mail: jvr.prasad@aerospace.gatech.edu
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April 2010
Research Papers
Experimental Analysis of a Waveguide Pressure Measuring System
Matthew A. White,
Matthew A. White
Compressor Research Laboratory, School of Aerospace Engineering,
e-mail: maw@gatech.edu
Georgia Institute of Technology
, Atlanta, GA 30332
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Manuj Dhingra,
Manuj Dhingra
Compressor Research Laboratory, School of Aerospace Engineering,
e-mail: m.dhingra@gatech.edu
Georgia Institute of Technology
, Atlanta, GA 30332
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J. V. R. Prasad
J. V. R. Prasad
Compressor Research Laboratory, School of Aerospace Engineering,
e-mail: jvr.prasad@aerospace.gatech.edu
Georgia Institute of Technology
, Atlanta, GA 30332
Search for other works by this author on:
Matthew A. White
Compressor Research Laboratory, School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332e-mail: maw@gatech.edu
Manuj Dhingra
Compressor Research Laboratory, School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332e-mail: m.dhingra@gatech.edu
J. V. R. Prasad
Compressor Research Laboratory, School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332e-mail: jvr.prasad@aerospace.gatech.edu
J. Eng. Gas Turbines Power. Apr 2010, 132(4): 041603 (7 pages)
Published Online: January 26, 2010
Article history
Received:
March 24, 2009
Revised:
April 7, 2009
Online:
January 26, 2010
Published:
January 26, 2010
Citation
White, M. A., Dhingra, M., and Prasad, J. V. R. (January 26, 2010). "Experimental Analysis of a Waveguide Pressure Measuring System." ASME. J. Eng. Gas Turbines Power. April 2010; 132(4): 041603. https://doi.org/10.1115/1.3159387
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