喷流作用下的单边膨胀后体气动载荷

doi:10.7527/S1000-6893.2021.25797

摘要/Abstract

星空online正规渠道 - 星空online（中国）

摘要： 高隐身无人机为提高侧向、后向隐身指标，机身和喷管-后体结构的一体化设计尤为重要，该设计在气动、结构、强度等领域带来了新的挑战，喷流作用下的气动载荷预测是其中一个关键问题。更多阅读利用CFD方法结合风洞试验数据，对高隐身无人机喷管-后体结构的稳态、动态气动载荷及其影响规律进行研究，结果表明：喷流形成的复杂波系投影到后体壁面上会形成压力、吸力交替的气动载荷，该载荷分布对喷管落压比极为敏感，小幅度的落压比变化即可能导致载荷方向变化；稳态气动载荷分布也会受到来流速度、次/主流流量比等的影响。基于IDDES方法的数值计算对动态气动载荷有不错的预测精度，将流场划分为喷流主流与次流掺混区、喷流核心区、喷流与外流掺混区等几个区域，有助于从流动机理上揭示脉动压力的分布规律，且得到了试验验证。动态载荷极值区位于喷流区边界，正是气流剪切掺混最强的位置，而喷流核心区尽管稳态气动载荷强，但动态气动载荷相对较低。

关键词: 喷流, 后体, 载荷, 无人机, 气动更多阅读

Abstract: The integrated design of fuselage and nozzle after-body structure is particularly important in improving the lateral and backward stealth performance of high stealth UAV. However, the design also brings new challenges in fields of aerodynamics, structure and strength. The prediction of aerodynamic load under the effect of jet is one of the key problems. Therefore, based on the CFD method and wind tunnel test data, the steady and dynamic aerodynamic loads and their influence laws of high stealth UAV nozzle and after-body structure are studied. The main conclusions are as follows:the complex wave system formed by the jet projected onto the after-body wall will form the aerodynamic loads of alternating pressure and suction, which are rather sensitive to the nozzle pressure ratio. A small pressure ration change may lead to the change of lad direction, and the steady-state aerodynamic load distribution is also affected by the inflow velocity and the secondary/mainstream flow ratio. The numerical calculation based on IDDES method also has good prediction accuracy for dynamic aerodynamic load. The flow field is divided into several regions, such as the mixing region of jet mainstream and secondary flow, the core region of jet, the mixing region of jet mainstream and secondary flow, the core region of jet, the mixing region of jet and outer-flow, which is helpful to reveal the distribution law of fluctuating pressure from the flow mechanism, and has been verified by experiments. The results show that the extreme region of dynamic load is located at the boundary of jet region, where the shear mixing is the strongest. While, in the core region of the jet, although the steady aerodynamic load is strong, the dynamic aerodynamic load is relatively low.

Key words: jet, after-body, load, UAV, aerodynamic

中图分类号:

V212.1

李虹杨, 王霄, 孙超, 刘方良, 于东升, 朱宇. 喷流作用下的单边膨胀后体气动载荷[J]. 航空学报, 2021, 42(8): 525797-525797.

LI Hongyang, WANG Xiao, SUN Chao, LIU Fangliang, YU Dongsheng, ZHU Yu. Aerodynamic load of unilateral expanded after-body under jet effect[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(8): 525797-525797.

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