Turbine blade cooling experiments often use mixtures of air and a heavy gas (CO2, SF6) to simulate coolant/mainstream density ratios. If the mixing of the mainstream with the coolant ejected from the blade is of interest, then it may be necessary to determine the spatial distribution of the heavy gas concentration in the flowfield. Commercial analyzers are too slow and have other disadvantages when used for this purpose. To meet this special need, a device has been developed to continuously monitor the heavy gas concentration in a small sample stream by determining the speed of sound in the sample. Together with the temperature of the sample, the information is sufficient to determine the concentration. The device measures the time of propagation for an ultrasonic burst transverse to the stream. The temperature of the gas contained in the device is controlled and measured. Calibration with several gas mixtures (air and CO2, SF6, He) has shown an uncertainty (Cmeas-Ctrue) of 2% over the full concentration range of 0–100%, for CO2 and SF6. The device is operable in the pressure range from −50 to 100 kPa gauge and in the temperature range from 0 to 40 °C. The instrument is rugged and will survive in noisy, turbulent environments.
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ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition
June 7–10, 1999
Indianapolis, Indiana, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7861-3
PROCEEDINGS PAPER
Continuous Monitoring of Binary Gas Mixture Concentration With Application to Turbine Blade Cooling Experiments
Tomas Strilka,
Tomas Strilka
University of Cincinnati, Cincinnati, OH
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Miklos Sajben,
Miklos Sajben
University of Cincinnati, Cincinnati, OH
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Peter Nagy
Peter Nagy
University of Cincinnati, Cincinnati, OH
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Tomas Strilka
University of Cincinnati, Cincinnati, OH
Miklos Sajben
University of Cincinnati, Cincinnati, OH
Peter Nagy
University of Cincinnati, Cincinnati, OH
Paper No:
99-GT-365, V004T04A021; 10 pages
Published Online:
December 16, 2014
Citation
Strilka, T, Sajben, M, & Nagy, P. "Continuous Monitoring of Binary Gas Mixture Concentration With Application to Turbine Blade Cooling Experiments." Proceedings of the ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General. Indianapolis, Indiana, USA. June 7–10, 1999. V004T04A021. ASME. https://doi.org/10.1115/99-GT-365
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