基于动网格的罗茨式动力机容腔流动瞬态模拟

Numerical simulation of transient flows in roots-type power machine based on dynamic mesh method

为准确研究罗茨式动力机在旋转工作过程中的动态特性,基于非结构动网格技术,模拟罗茨式动力机容腔内部实时工作过程,进行了三维瞬态湍流数值模拟,并分析了容腔内部瞬时压力场与速度场的变化规律。仿真模拟结果与计算理论数据的对比结果表明该模型可较准确反映罗茨式动力机的基本工作过程,随后实验平台的搭建与测试数据进一步验证了结果的准确性。结果表明在罗茨式动力机内部流场的动态变化中,动网格技术可以实现较好的模拟,从而为罗茨式动力机内部结构优化提供良好的理论依据,并且该技术可成为流体机械和能源回收研究方向行之有效的方法,可减少试验的不确定性并提高试验的准确性,从而节约时间。

In order to accurately capture the dynamic characteristics of roots-type power machine in the working process of rotating,based on the unstructured moving mesh technique,the real-time working process in the cavity of roots type power machine is simulated,the three-dimensional transient turbulence numerical simulation is carried out,and the changing rules of instantaneous pressure field and velocity field in the cavity are analyzed.The comparison between the simulation results and the calculated theoretical data shows that the model can accurately reflect the basic working process of roots-type power machine.Then the experimental platform and test data further verify the accuracy of the results.Results show that in roots-type engine dynamic changes of the internal flow field,the dynamic grid technique can achieve a better simulation,which roots-type power engine provides good theoretical basis for structure optimization,and the technology can become effective research directions in fluid machinery and energy recovery method,it can reduce the uncertainty of test and improve the accuracy of the test,so as to save time.