Work

Optimization of Temperature Measurement Method for High-Pressure Gas Flow Standard Facility Based on Sonic Nozzle Array

Year: 2024

Type: article

Abstract: In order to improve the accuracy of wind tunnel test, relying on the high pressure gas source of China Aerodynamic Research and Development Center, a secondary flow standard facility based on sonic nozzle array is developed, and its pressure range is (1~6)MPa, and flow range is (0.12~5.55)kg/s. At present, most facilities use the average temperature measured by the temperature array to represent the upstream temperature of the sonic nozzle array. However, the small flow calibration test results show that, the maximum temperature difference upstream of the standard sonic nozzle array is 1.97 K, the temperature field upstream of the sonic nozzle array shows non-uniformity, so the above method cannot accurately obtain the upstream temperature. To solve this problem, each nozzle used in the standard sonic nozzle array was accurately measured by temperature sensors. And the uncertainty of the facility and the discharge coefficient of the calibrated nozzle between the two methods were compared. Results show that, compared with the discharge coefficient obtained by the tempearture sensor array of 0.9902, the accurate measurement of 0.9904 is closer to National Institute of Metrology, China(NIM) traceable result of 0.9907, and the relative uncertainty of the facility is reduced from 0.124% (k=2) to 0.120% (k=2).

Source: Aerospace

DOI: 10.3390/aerospace11120986

Authors: Zhihao Zhang, Jiaxi Zhao, Tingting Liu, Rongping Zhang

Institutions: Southwest University of Science and Technology, State Key Laboratory of Aerodynamics

Language: English

Topic: Flow Measurement and Analysis

Subfield: Mechanics of Materials

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,728

Funder: National Natural Science Foundation of China