复合绝缘子表面湿润积污过程的数值模拟方法

为深入了解绝缘子外部在湿润条件下的积污机理,基于计算流体力学原理CFD建立了求解湿润气象条件下复合绝缘子外部三维两相粘性不可压缩湍流流场的基本控制方程组和尘埃颗粒对流扩散的基本方程,提出应用CFD软件Fluent可对复合绝缘子表面固体尘埃颗粒湿沉降过程进行动态模拟的一般方法。结果表明:不同伞裙结构的复合绝缘子水滴撞击特性和尘埃颗粒对流扩散特性不同;绝缘子外流场尘埃颗粒的湿沉降过程可以简化为气液两相湍流和尘埃颗粒对流扩散的耦合问题;水滴的碰撞系数E,伞裙和杆径区域的烟灰(粒子)浓度c,一定程度上反映复合绝缘子是否容易积污以及覆冰和发生冰棱桥接。

Numerical Simulation Method on Humid Pollution Process Around Composite Insulator's Surface

In order to understand the mechanism of pollution process around insulator under the wet condition better,based on the principle of computational fluid dynamics CFD, the numerical model,which was used to analyze three-dimensional two-phase uncompressible turbulent flow field around composite insulator in wet weather and convection-diffusion of dust particles,was established.Then,the dynamic simulation of the general approach,which was used to analyze solid dust particles' wet deposition process around composite insulator with application of CFD software-Fluent,was proposed. It is found that composite insulator'different umbrella skirt structure causes water droplets'collision characteristics and dust particles'convection-diffusion characteristics differently;and solid dust particles'wet deposition process around composite insulator can be simplified the coupling problem of gas-liquid two-phase turbulence field and dust particles'convecton-diffusion field;to some extent,the collision coefficient E and soot'(particulate) concentration c around umbrella skirts and rod diameter region can reflect whether the composite insulator is easy to be pollution deposited or ice coated and ice bridged.