Volume 39, Number 5, October 2021
|Page(s)||1064 - 1069|
|Published online||14 December 2021|
Developing and applying Mach 4.5 nozzle in hypersonic wind tunnel
China Aerodynamics Research and Development Center, Mianyang 621000, China
Mach 4.5 tests in a conventional trans-supersonic wind tunnel are often accompanied by the air liquefaction phenomenon, resulting in the low reliability of test data. The Mach 4.5 nozzle developed in a hypersonic wind tunnel is able to heat airflow and provide more accurate test data. At present, China does not have the capability to test the Mach 4.5 nozzle in the 0.5-meter hypersonic wind tunnel. This gap may be filled by developing the Mach 4.5 nozzle in the hypersonic wind tunnel. The axisymmetric nozzle profile was calculated by the inviscid flow calculation method, and the boundary layer was modified by the Sivells-Payne method. Then, the numerical simulation was carried out, and the simulation results prove that the nozzle profile thus calculated meets the design requirements of the Mach number. For its structural design, a three-section design method is adopted to ensure the continuity and smoothness of the inner surface so as to better calibrate the flow field. Standard model tests were also carried out. The test results show that the velocity field of the Mach 4.5 nozzle we developed meets technical requirements. The standard model test data provide data reliable support for the development of aircraft.
Key words: hypersonic speed / wind tunnel / Mach number / nozzle / flow field / aircraft
关键字 : 高超声速 / 风洞 / 马赫数 / 喷管 / 流场 / 飞行器
© 2021 Journal of Northwestern Polytechnical University. All rights reserved.
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