提高涡流二极管性能的数值仿真分析

Numerical Simulation Analysis for Improving the Performance of Vortex Diode

本文数值仿真分析了涡流二极管正、反向流的阻力特性及其内部流场,提出可提高涡流二极管性能的结构优化方法。对比计算表明RSM模型和PRESTO!压力离散格式对涡流管反向流进行仿真的计算精度最好。基于对反向流涡量场和流场的分析,认为强涡旋是反向高阻的主要原因;且旋涡中心和涡流腔室中心不重合,造成涡流不稳定,提出利用螺旋腔室改进;并通过抬高涡流腔室下壁中部,同时对轴向管与涡流腔室衔接处进行倒角,可降低正向流阻力,最后达到提高涡流二极管双极性的目的。

The article has proposed several structure optimization methods available to improve the performance of vortex diode through numerical simulation of it.The results show that RSM model and PRESTO! pressure discrete form has the best calculating accuracy in simulation of the reverse flow.The high resistance in reverse flow is mainly caused by vortex.The phenomenon of misalignment of vortex center and the center of vortex chamber is also found which causes the unstable vortex Thus the article proposes the application of spiral chamber,raise the center of the vortex chamber floor and chamfer the junction of axial nozzle to promote the diodicity of vortex diode.