高速旋转流动中泰勒涡转捩点理论研究

Based on the rotating flow process of supercritical carbon dioxide (SCO₂) turbine shaft, this paper conducts a numerical investigation of flow characteristics with SCO₂ in the high-speed rotating annulus. The numerical method for simulation of SCO₂ Taylor-Couette-Poiseuille (TCP) flow is validated by existing experimental results. The key factors of Taylor vortices formation and Taylor vortex initial position are analyzed and discussed at the range of Ta=6.63×10¹⁰∼6.37×10¹¹. As the results show, firstly, the Taylor vortices will be generated in the annulus, and the initial position of the vortex is related to axial ratio, radius ratio, Taylor number, and axial Reynolds number. Secondly, increasing the mass flow, decreasing the rotational speed, decreasing the aspect ratio and increasing the radius ratio can restrain the formation of Taylor vortex and improve the flow stability. Finally, a correlation of the initial position of Taylor vortex for SCO₂ TCP flow is presented in this paper, and the relative average error of the correlation is 5.3%.