基于计算流体力学的支柱绝缘子积污特性研究

Research on Contamination Deposition Characteristics of Post Insulator Based on Computational Fluid Dynamics

为了研究影响绝缘子积污的因素,收集了支柱绝缘子的尺寸数据,建立了风洞仿真模型。利用计算流体力学的相关理论与方法,分析了4种因素对绝缘子表面污秽颗粒物碰撞质量的影响。仿真结果表明:颗粒物质量浓度对绝缘子表面颗粒物碰撞质量的影响是线性的;随着风速增加,绝缘子上、下表面碰撞质量均迅速增加,但在表面形状差异较大时会有不同的增加趋势;颗粒粒径增大将使上表面碰撞质量迅速增加,对下表面碰撞质量则没有明显影响;绝缘子伞形不变时,杆径增大将使碰撞质量密度显著减小。对比仿真结果与试验结果发现:仿真结果与文献中的风洞试验所得数据差距较大,分析认为是对于黏附的考虑不足所引起的。

In order to study the factors influencing insulators＇ contamination deposition, we gathered the dimensions of some post insulators and set up numerical models for wind tunnel simulation. On the basis of the theory of computational fluid dynamics, we discussed four factors that affect the trapped mass of insulators. It is concluded that the concentration of particles has a linear function on the taped mass of the insulator surface. Higher wind velocity will lead to more trapped mass on both the top surfaces and the bottom surfaces of insulators, though different profiles of the top and bottom sur- faces can result in distinct tends. Meanwhile, growth in the mean diameter of particles will increase the trapped mass of the top surfaces but barely affects the bottom surface. Moreover, for any certain shape of insulator, increasing the diameter of insulator rod significantly will reduce the density of contamination deposition. Further comparison indicates a consi- derable difference between the simulation results and some reported experimental data from wind tunnel tests, which is probably due to the insufficient consideration of the adhesion effect in the simulations.