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为了获得高超声速飞行器非设计点上较好的性能,包括单边膨胀喷管(SERN)在内的几何可调方案成为了目前研究的热点,针对单边膨胀喷管开展了流固耦合的研究,重点分析流固耦合中的动态载荷问题,不考虑结构传热及重力的影响,对不同几何调节位置上的SERN开展了计算分析。结果表明在不同位置上,SERN唇口板均出现了超声速颤振。通过进一步分析,获得结论如下:(1)唇口板振动特点主要由材料属性和结构决定;(2)唇口板在不同调节位置上,振动频率大致均为结构的一阶振动频率,喷管升力的振荡范围较喷管推力的振荡范围大;(3)随着唇口板角度的增加,唇口板振幅增大。
In order to obtain better performance at non-design points of hypersonic vehicles, geometrically adjustable schemes including SERN have become the hot topics of current research, and the study of fluid-solid coupling for unilateral expansion nozzles , Focusing on the analysis of dynamic load in fluid-solid coupling, without considering the influence of heat transfer and gravity, the calculation and analysis of SERN at different geometrical adjustment positions are carried out. The results showed that SERN lip plate appeared supersonic flutter in different positions. Through further analysis, the conclusions are as follows: (1) The vibration characteristics of the lip plate are mainly determined by the material properties and structure; (2) The lip plate at different adjustment positions, the vibration frequency are roughly the first-order vibration frequency of the structure, The oscillation range of lift is larger than the oscillation range of nozzle thrust. (3) As the angle of lip plate increases, the amplitude of lip plate increases.