Abstract In this reported study, a new Q criterion was proposed to analyze the vortex in three cyclones that had various inlet structures. The Reynolds stress model (RSM) was used to simulate the gas flow, and the Phase Doppler Particle Analyzer (PDPA) was used to measure the fluid velocity. The results showed that the vortex structure was intuitive according to the new isovortex surface that was obtained using the Q criterion. The isovortex surface was found to be distorted and not distributed around the center axis. With the development of flow, the equivalent diameter of the isovortex surface gradually decreased. The magnitude of the vorticity and the vortex lines of axisymmetrical volute inlet (AVI) structure were more uniform and symmetrical than those found into the single tangential inlet (STI) structure and the single volute inlet (SVI) structure.

中文翻译：

---

不同入口结构对旋风分离器流场的影响

摘要 在本报告的研究中，提出了一种新的 Q 判据来分析具有不同入口结构的三个旋流器中的涡流。雷诺应力模型（RSM）用于模拟气体流动，相位多普勒粒子分析仪（PDPA）用于测量流体速度。结果表明，根据使用 Q 准则获得的新等涡面，涡结构是直观的。发现等涡旋面扭曲并且没有围绕中心轴分布。随着流动的发展，等涡面的等效直径逐渐减小。