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为了更加深入地研究供应管路-喷嘴系统的动态特性,在喷嘴动力学理论的基础上,建立了考虑供应管路流固耦合作用的传递矩阵组合计算模型。针对三种典型液体火箭发动机喷嘴与一维供应管路组成的系统,开展了两端固定边界的系统动力学特性数值模拟。结果表明:管路结构谐振与管内流体谐振所导致的喷嘴出口位置流体速度振荡量级相当,管路流固耦合作用对系统动态特性的影响不能忽略;管路结构谐振是造成其固定位置应力的频率响应幅值较高的主要因素;当流体与结构的谐振频率接近时,会产生一个大带宽、高幅值的应力耦合振荡区间,随着管壁厚度的增大,耦合振荡的带宽也随之增大;对于文中算例,流固耦合作用对流体谐振造成的系统振荡具有约5%的降频作用。
In order to further study the dynamic characteristics of the supply pipe-nozzle system, based on the nozzle dynamics theory, a transfer matrix combination calculation model considering the fluid-structure interaction of the supply pipe was established. Aiming at the system composed of three typical liquid rocket motor nozzles and one-dimensional supply pipeline, the numerical simulation of system dynamics at both ends fixed boundary is carried out. The results show that the resonance of the pipeline structure is equivalent to the magnitude of fluid velocity oscillation at the outlet of the nozzle due to the resonance of the fluid in the pipe. The fluid-structure coupling effect of the pipeline can not ignore the dynamic characteristics of the system. When the resonant frequency of the fluid is close to the structure, a large bandwidth and high amplitude stress-coupled oscillation range will be generated. With the increase of the thickness of the pipe wall, the coupling oscillation bandwidth For the example in the paper, the fluid-structure interaction has about 5% frequency reduction effect on the system oscillation caused by the fluid resonance.