关键词: 旋转盘腔, 速度分布, 涡量, 压损

Abstract: A particle image velocimetry (PIV) test setup was used to study the fluid flow characteristics of axial center cross-section in a low speed rotating cavity, and three-dimensional numerical simulation of flow field in low-speed rotating cavity was performed based on the Realizable k-e model. The results of simulation were consistent with those from experimental study with a maximum relative error less than 16.9%, indicating the validity of the simulation methods and model. Besides, the effects of number and length of deflector, Reynolds number () of cavity inlet and rotating Reynolds number on fluid flow in the rotating cavity were examined based on the model equation. The results show that Re of cavity inlet, number and relative length of deflector have obvious impact on volume-averaged relative velocity and vorticity in the cavity, when Re of cavity inlet varies from 17000 to 53000, volume-averaged relative velocity and vorticity increases 2.4 times and 1.6 times, respectively. When the number of deflector varies from 0 to 4, the growth rate of that is 62% and 30% respectively. When the relative length of deflector increases from 0.5 to 0.93, volume-averaged relative velocity and vorticity increases 114% and 58% respectively. Pressure loss in the cavity is affected mainly by Re of cavity inlet, when Re of cavity inlet varies from 17000 to 53000, pressure loss in the cavity increases 8 times, while with the increase of number and relative length of deflector, pressure loss increases less than 5%. Under the present investigation conditions, in order to improve fluid disturbance in the cavity and reduce fluid flow resistance, it would be better to select an appropriate inlet velocity of the cavity, install deflectors and increase its relative length.

Key words: rotating disk cavity, velocity distribution, vorticity, pressure loss