高速转动圆盘流动数值模拟研究

重点研究高速离心压气机叶轮与机匣间的间隙流动及其温度分布。研究将离心压气机简化为高速转动圆盘,搭建了相关实验平台,并开展了相应的数值模拟研究。通过改变转动圆盘的转速和轴向进入的冷却流的流量,研究了转速和流量对于间隙内温度和速度分布的影响。结果显示,转速是影响温度变化的最主要因素,转速越大,温度越高;同等幅度的流量变化对温度的影响则较小。研究发现,在实验和模拟对应的大雷诺数条件下,无量纲的速度分布基本不受到圆盘转速、冷却流量和温度场的影响。

Numerical investigation of flows between rotating disks

The flow structure and temperature distributions in the cavity between the impeller and casing of a centrifugal compressor are studied numerically in this work.The impeller can be modeled as a fast rotating disk.The experiment and numerical simulations of the rotating disk are compared.The influence of rotating speed and cooling air mass flow rate on the velocity and temperature distributions has been investigated.It reveals that the temperature is mainly affected by the rotating speed and increases as the disk rotation speeds up.By comparison,the effect of the increasing of cooling air to the result of temperature is smaller as the disk speed.Meanwhile,the distribution of non-dimensional velocity components is the same under different rotating speed and cooling air mass flow rate.