燕山大学 河北省重型装备与大型结构力学可靠性重点实验室, 河北 秦皇岛 066004
*邮箱: tianzhenguo1@163.com
收稿:2022-06-02,
网络首发:2023-12-15,
纸质出版:2023-10-30
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王琛, 田振国, 沈振兴. 等离子体环境下高超声速飞行器的流-固耦合机制[J]. 兵工学报, 2023,44(10):3038-3046.
Chen WANG, Zhenguo TIAN, Zhenxing SHEN. Fluid-Structure Interaction Mechanism of Hypersonic Aircraft in Plasma Environment[J]. Acta Armamentarii, 2023, 44(10): 3038-3046.
王琛, 田振国, 沈振兴. 等离子体环境下高超声速飞行器的流-固耦合机制[J]. 兵工学报, 2023,44(10):3038-3046. DOI: 10.12382/bgxb.2022.0477.
Chen WANG, Zhenguo TIAN, Zhenxing SHEN. Fluid-Structure Interaction Mechanism of Hypersonic Aircraft in Plasma Environment[J]. Acta Armamentarii, 2023, 44(10): 3038-3046. DOI: 10.12382/bgxb.2022.0477.
高超声速飞行器在高温空气中穿行时处于等离子体环境中
相较于热完全气体有较大不同。考虑等离子体真实气体效应才能更好地计算飞行器与周围流体的流体与固体(简称流固)耦合作用。基于等离子体化学非平衡流体动力学方程组
结合流固耦合方程建立流固耦合模型。以RAM-C飞行器为算例计算并验证该模型
分析飞行器的流固耦合作用机制。计算结果表明:等离子体相较于热完全气体
气动压力增大
气动黏性力增大
最大气动黏性力位置发生迁移;等离子体气动荷载的作用位置利于钝体承受
最大流固耦合应力相较于热完全气体更小;高速飞行器前端主要承受原子气体的流固耦合作用
电子和离子对飞行器的流固耦合作用十分微小
在中部及后部分子气体对飞行器的作用更加明显。
Hypersonic vehicles are in a plasma environment when passing through high-temperature air
different from thermal perfect gas conditions. Accounting for the real gas effect of plasma is crucial for accurately calculate the fluid structure interaction between aircraft and surrounding fluid. In this paper
based on the plasma chemical non-equilibrium hydrodynamic equations
combined with the fluid solid coupling equations
a fluid solid coupling model is established. Taking the RAM-C aircraft as an example
the model is calculated and verified
and the fluid structure interaction mechanism of the aircraft is discussed. The results show that the aerodynamic pressure and aerodynamic viscosity of plasma increase
and the position of the maximum aerodynamic viscosity shifts compared with that of thermal perfect gas. The position of plasma aerodynamic load is favorable for the bluff body to bear
and the maximum fluid solid coupling stress is less than that of thermal perfect gas. The front end of high-speed aircraft mainly bears the fluid solid coupling of atomic gas
while the fluid solid coupling of electrons and ions on the aircraft is very low. The effect of molecular gas on the aircraft is more obvious in the middle and rear parts.
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NIE C S , YANG G , NIE L , et al . Influence of ablation products of aircraft pyrolytic carbonized material on plasma flow field [J ] . Acta Armamentarii , 2022 , 43 ( 3 ): 513 - 523 . (in Chinese) DOI: 10.12382/bgxb.2021.0161 http://doi.org/10.12382/bgxb.2021.0161 The heat-resistant material on the surface of high-speed aircraft will decompose and ablate at the high temperature generated by aerodynamic heating. After entering the flow field,the ablation products react with the high-temperature air in the flow field, thus affecting the component concentration and plasma distribution in the air flow field around the aircraft. Based on solving the thermochemical non-equilibrium Navier-Stokes equations,a three-dimensional plasma flow field calculation method coupling the ablated wall surface is established. The plasma flow field of RAMC-II is predicted and compared with the flight test data to verify the reliability of the proposed method. The influence of material ablation on plasma flow field of lifting body aircraft is analyzed. The results show that the electron density in the flow field on the head of the aircraft is the highest, the electron density in the body area is reduced by two or three orders of magnitude,and NO<sup>+</sup> and N<sup>+</sup> contribute most to the electron number density in the flow field. The ablation products injected into the flow field increase the separation distance of shock wave and the thickness of plasma layer. With the development of the flow downstream,the ablation rate of the aircraft body decreases, but the influence range of ablation products on the plasma flow field becomes larger, and the electron number density of the body flow field increases to a certain extent.With the increase in Mach number, the ablation rate of wall increases, and the influence of ablation products is more obvious. The peak electron density on stagnation line changes little, but the electron number density on symmetrical surface of body increases significantly. For the same kind of ablative materials with different components, the influences of ablated products of different materials entering into the flow field on the shock wave separation distance and the peak electron number density are different.
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