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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2020, Vol. 41 ›› Issue (4): 123596-123596.doi: 10.7527/S1000-6893.2019.23596

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Wind tunnel measurement techniques for sonic boom near-field pressure

LIU Zhongchen1,2, QIAN Zhansen1,2, LENG Yan1,2, GAO Liangjie1,2   

  1. 1. AVIC Aerodynamics Research Institute, Shenyang 110034, China;
    2. Aviation Key Laboratory of Science and Technology on High Speed and High Reynolds Number Aerodynamic Force Research, Shenyang 110034, China
  • Received:2019-10-21 Revised:2019-12-13 Online:2020-04-15 Published:2019-12-12
  • Supported by:
    National Natural Science Foundation of China (11672280)

Abstract: For the sonic boom test in the intermittent supersonic wind tunnels, the accurate measurement technology for sonic boom near-field pressure is developed. Technical verification is carried out in FL-60 wind tunnel of AVIC Aerodynamics Research Institute. FL-60 wind tunnel is a trisonic blow down wind tunnel with Mach number range from 0.3 to 4.2, and the test section size is 1.2 m×1.2 m. The test time of each run is usually tens of seconds. According to the characteristics of intermittent wind tunnels with short run time and large air consumption, a non-reflective pressure measurement rail is designed, which significantly improves the efficiency of the measurement of sonic boom near-field pressure. The CFD technology is utilized to analyze the flow characteristics of the non-reflection rail, model installation position and structure of shock wave system in the wind tunnel test section, and the feasibility of the non-reflection rail is verified. The Seeb-ALR low boom model and the self-designed axisymmetric model with jet are utilized to carry out the validation test. The high-quality measurement data are obtained by using the reference run method and spatial averaging technology as auxiliary method. The test results are in good agreement with the CFD calculation, which verifies the rationality of the sonic boom near-field pressure measurement system.

Key words: sonic boom, near-field, spatial pressure measurement, non-reflection rail, spatial averaging

CLC Number: