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| Temperature field measurement and analysis of high-pressure critical flow Venturi nozzle gas flow standard device |
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Abstract Based on the high-pressure gas source, a high-pressure critical flow Venturi nozzle gas flow standard device was established. In the calibration experiment of small flow rate, the temperature field distribution upstream of the standard critical flow Venturi nozzle array has an important influence on the measurement uncertainty. Aiming at the temperature field upstream of the standard critical flow Venturi nozzle array, in the calibration experiment of the critical flow Venturi nozzle with throat diameter of 8.251 mm, the temperature field distribution characteristics of three different standard critical flow Venturi nozzle array combinations and different flow rates were analyzed and compared. The experimental results show that the maximum temperature difference upstream of the standard critical flow Venturi nozzle array is 1.97 K at a small flow rate, with the increase of the flow rate in the tube, the unevenness of the temperature field distribution decreases; the maximum temperature difference in the upstream of the array varies from 1.10 K to 1.97 K under three different combinations of standard critical flow venturi nozzle arrays. Therefore, in order to improve the measurement accuracy of stagnation temperature, it is necessary to optimize the temperature measurement method under small flow rate.
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Received: 19 March 2024
Published: 19 March 2025
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2025, Vol. 46 
