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| Study on Perturbation Introduction Method of Asymmetric Vortex Simulation of Slender Body at High Angle of Attack |
| ZHANG Shaoguang， XIAO Maochao， ZHANG Yufei， CHEN Haixin |
| School of Aerospace Engineering， Tsinghua University， Beijing 100084， China |
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Abstract （School of Aerospace Engineering， Tsinghua University， Beijing 100084， China）
Abstract: When the missile flies at high angle of attack, it will generate complex asymmetric vortex, resulting in large side force, which will have a serious impact on the flight control of the missile. It is often necessary to introduce artificial perturbation to describe the phenomenon of generating side force in the test by numerical method. In this paper, the improved delayed detached-eddy simulation （IDDES） method with shear layer adaptation is used to calculate the missile configuration with /without perturbation, and the calculated results are compared with the experimental results. Without adding perturbation and at 40 degree angle of attack, the fully symmetrical vortex is calculated, and there is almost no side force, which eliminates the uncertainty and non-physics of asymmetric effect caused by numerical error. Adding a suitable "strake" to the missile head to introduce the perturbation and simulate the asymmetric effect caused by the test can accurately predict the separation of the missile. The pressure distribution is in good agreement with the test results.
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Received: 15 August 2022
Published: 27 September 2022
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2022, Vol. 5 
