典型覆冰导线碰撞系数仿真分析

Simulation Analysis of Collision Coefficient on Typical Shaped Iced-conductors

覆冰碰撞系数是导线覆冰生长预测的关键参数。基于气液两相流标准湍流模型和欧拉—拉格朗日原理建立导线外部二维流场数学模型,计算水滴的运动轨迹,实现对圆形、椭圆形、翼形3种典型导线覆冰的碰撞系数仿真;并分别给出不同迎风攻角下椭圆形、翼形覆冰的碰撞系数。仿真结果表明：在相同气象条件下,圆形截面覆冰导线碰撞系数较长短轴比4：3的椭圆形高出4.79%~6.21%,较翼形高出4.04%~8.14%;相同导线覆冰形状在0°~30°迎风攻角范围内,攻角越大,碰撞系数越高。

Icing collision coefficient is a key parameter for predicting the standard turbulence model of gas liquid two phase flow and Euler Lagrange growth of conductor icing. Based on the principle, the mathematical model of the two dimensional flow field is established, and the collision coefficient of three typical conductor icing is calculated. The airfoil ice and ellipse ice collision coefficients at different attack angles are calculated. The simulation result shows that the collision coefficient of circular cross section ice is 4.79%--6.21% more than elliptical ice with a axial ratio of 4：3 and 4.04%-8.14% more than wing shape ice under the same weather conditions. The shape of the ice cover in the same wire is in the range of 0°-30°, the higher the attack angle, the higher the impact coefficient is.