ABSTRACT This paper explores continuous pressure wave characteristics and flow features in a periodic transient flow induced by a rotary pressure wave generator. A three-dimensional CFD model based on the realizable k-ϵ turbulence model is established to conduct the simulations. The results show that the turbulent kinetic energy evolution in the periodic transient flow is similar to that in an instantaneous transient flow. In addition, there exists an optimal frequency corresponding to the maximum wave amplitude, which is closely related to the fluid properties and system parameters. When the disturbance frequency is less than the optimal frequency, the pressure and velocity derivative satisfy a linear relation in all zones of the upstream pipe. In contrast, a linear zone away from the rotor is locally formed at regions where the linear relation is approximately valid. Correspondingly, a nonlinear zone is near the rotor where the linear relation is inapplicable. The disturbance frequency significantly affects the axial wave amplitude distribution.

中文翻译：

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使用三维 CFD 模型研究周期性瞬态流中的连续压力波

摘要 本文探讨了由旋转压力波发生器引起的周期性瞬态流中的连续压力波特性和流动特征。建立了基于可实现 k-ϵ 湍流模型的三维 CFD 模型进行模拟。结果表明，周期性瞬态流中的湍动能演化与瞬时瞬态流中的湍动能演化相似。此外，存在对应于最大波幅的最优频率，该频率与流体性质和系统参数密切相关。当扰动频率小于最佳频率时，压力和速度导数在上游管道的所有区域都满足线性关系。相比之下，在线性关系近似有效的区域局部形成远离转子的线性区域。相应地，线性关系不适用的转子附近存在非线性区域。扰动频率显着影响轴向波振幅分布。