离心力对旋叶式分离器壁面液膜界面不稳定性的影响

Centrifugal Force Effect on Film Interfacial Instability on The Wall of Cyclone Separator

本文对旋转流场条件下离心力对旋叶式分离器壁面液膜界面不稳定性的影响规律进行了理论研究。首先利用势函数对汽液两相的动量方程和连续方程进行线性化处理。然后通过对无黏条件下液膜界面的受力分析,获得汽液界面的动力学边界条件和运动学边界条件,结合线性化方程组建立液膜界面波的色散方程。根据力平衡原理获得了液膜运动规律,并结合色散方程建立了界面不稳定发生的判定准则关系式。基于所获得的理论模型编写计算程序,对界面稳定性进行计算分析。研究发现,旋转流场条件下的离心力能够抑制旋叶式分离器壁面液膜界面不稳定的发生。

Theory study was performed for centrifugal force effect on film interfacial instability on the wall of cyclone separator in rotational flow in this paper. The momentum equations and continuity equations of gas-liquid fluid were linearized by substitution of potential function firstly. Then the dynamic boundary condition and kinematic boundary condition of interface were obtained base on stress analysis of film interface under inviscid condition. The dispersion relation of film interface wave was established by the combination of boundary conditions and the linearized equations. Based on dispersion relation and film motion law which was obtained by force equilibrium, the determination criterion of interracial instability was established. A computer program was developed based on the theory model to calculate interracial instability. It was found that centrifugal force had effect to constrain film interracial instability on the wall o{ cyclone separator in rotational flow.