| Citation: | ZHAO Jiaxi, ZHANG Zhihao, WU Songling, et al. Flow calibration system test based on critical flow Venturi nozzle array[J]. Journal of Aerospace Power, 2025, 40（7）：20240133 doi: 10.13224/j.cnki.jasp.20240133
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In order to improve the accuracy of wind tunnel test, a secondary flow standard device based on critical flow Venturi nozzle array was developed based on the high-pressure air source of China Aerodynamics Research and Development Center. The designed calibration pressure range was 1—6 MPa, and the flow range was 0.2—5.55 kg/s. The calibration device was composed of gas supply system, standard critical flow Venturi nozzle array and measurement system. The standard critical flow Venturi nozzles were traced to the pVTt method flow standard device of the National Institute of Metrology. The stability of the gas supply system, the temperature field inside the pipeline, and the repeatability of the discharge coefficient were experimentally studied. In addition, the uncertainty of the discharge coefficient was analyzed. The experimental results indicated that the gas supply system of the standard device had good stability. The uniformity of temperature distribution inside the pipeline increased with the increase of flow rate. The measurement repeatability of the discharge coefficient was within 0.04%, and the extended uncertainty (coverage factor
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