论文部分内容阅读
为了深入研究流固耦合(FSI)作用对液体火箭发动机充液导管频率特性的影响,采用传递矩阵法(TMM)建立了空间导管流固耦合动力学计算模型.针对真实发动机导管开展了传递矩阵模型与传统基于附加质量的有限元(FEM)(非耦合)模型仿真计算以及模态试验验证,比较了管径、壁厚等结构参数对导管流固耦合作用的影响.结果表明:在流固耦合作用下,导管各阶谐振频率减小、而对应的流体振荡与结构振动幅值增大.管径对导管低阶频率特性的影响较壁厚对其影响更大.对于该算例,当管径大于设计值30%后,耦合作用引起的1阶频率误差高于10%,此时流固耦合不能忽略;而壁厚对1阶谐振频率的影响则小于8%.
In order to further study the effect of fluid-solid coupling (FSI) on the frequency characteristics of liquid-filled liquid-filled rocket engine, the transfer matrix method (TMM) was used to establish the fluid-structure coupling dynamics model of the space catheter.The transfer matrix model Compared with the traditional finite element (FEM) (uncoupled) FEM simulation and modal test, the influence of structural parameters such as pipe diameter and wall thickness on the fluid-structure interaction of the pipe is compared. The results show that in the fluid-solid coupling The resonant frequency of each stage of the catheter decreases, while the corresponding fluid oscillation and the amplitude of the structure vibration increase.The influence of the diameter on the low-frequency characteristic of the catheter is more affected than the wall thickness.In this case, When the diameter is greater than 30% of the design value, the first-order frequency error caused by the coupling effect is higher than 10%. At this time, the fluid-solid coupling can not be neglected. The influence of wall thickness on the first-order resonance frequency is less than 8%.