Turbine blade cooling experiments often use mixtures of air and a heavy gas 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 monitor the heavy gas concentration continuously 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 He) has shown an uncertainty of 2 percent over the full concentration range of 0–100 percent for and The device is operable in the pressure range from −50 to 100 kPa gage and in the temperature range from 0°C to 40°C. The instrument is rugged and will survive in noisy, turbulent environments. [S0889-504X(00)01202-2]
Continuous Monitoring of Binary Gas Mixture Concentration With Application to Turbine Blade Cooling Experiments
Contributed by the International Gas Turbine Institute and presented at the 44th International Gas Turbine and Aeroengine Congress and Exhibition, Indianapolis, Indiana, June 7–10, 1999. Manuscript received by the International Gas Turbine Institute February 1999. Paper No. 99-GT-365. Review Chair: D. C. Wisler.
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Strilka, T., Sajben, M., and Nagy, P. (February 1, 1999). "Continuous Monitoring of Binary Gas Mixture Concentration With Application to Turbine Blade Cooling Experiments ." ASME. J. Turbomach. July 2000; 122(3): 570–578. https://doi.org/10.1115/1.1302285
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