| Citation: | MA Hongwei, LI He. Uncertainty of measuring isentropic efficiency of compressor by temperature rise method[J]. Journal of Aerospace Power, 2022, 37（10）：2242-2252 doi: 10.13224/j.cnki.jasp.20220457
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Based on Rotor37 single rotor compressor performance experiment data, Monte Carlo method and guide to the uncertainty in measurement method were used for uncertainty evaluation of measuring the compressor isentropic efficiency by temperature rise method, the measurement uncertainty of isentropic efficiency under different rotational speed and flow rate conditions were analyzed, and the allocation scheme of isentropic efficiency measurement uncertainty was studied. Results showed that the best estimate value and standard uncertainty evaluated by these two kinds of methods were basically the same, but the shortest inclusion interval of 95% inclusion probability evaluated by Monte Carlo method was narrower than that evaluated by guide to the uncertainty in measurement method, and the gap was bigger in case of non-normal distribution of input, so guide to the uncertainty in measurement method should be carefully used in such case. At the same speed, the measurement uncertainty of isentropic efficiency increased with the increase of flow rate. At different rotational speeds, the measurement uncertainty of isentropic efficiency increased with the decrease of rotational speed. It became a lot more difficult to measure the compressor isentropic efficiency of high accuracy by temperature rise method at low rotational speed. The results of isentropic efficiency measurement uncertainty allocation showed that higher accuracy of total temperature measurement was required for equal action allocation, making it more difficult for realization. Under the maximum flow condition of 70% designed rotational speed of the compressor studied, given that the relative measurement uncertainty of isentropic efficiency was 0.5%, the measurement uncertainty of total pressure and total temperature should reach 35 Pa and 0.083 K, respectively, according to equal accuracy allocation. Increasing radial measurement points, and using platinum resistance total temperature probe and gas flow total temperature calibration method can improve the measurement accuracy of both total temperature and isentropic efficiency.
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