【摘要】 本文考虑了铜绕组生热率(铜损耗体密度)随温度的变化,以及空心股线与冷却水边界上采用热-流体耦合单元并计及其对流换热系数的非线性,计算了定子端部绕组和定子铁心段等两个区域的三维温度场。计算值与实际运行数据比较接近,说明此方法有效。计算结果表明:定子齿部铁心温度高于轭部铁心温度;定子上下层绕组层间温度受冷却水温度的影响较大,大致等于上下层绕组温度最大值的平均值;绕组的冷却水带走了定子铜损耗的95.66%和定子铁心损耗的25%左右,半水冷发电机的冷却水对于发电机定子的冷却作用至关重要。更多还原

【Abstract】 The thermal-liquid coupling element is used in the boundary between cooling-water and hollow-strand,and the nonlinearity of its convection coefficient is taken into account.The heat-generation rate(volume-density of copper-loss) with temperature is considered.This paper calculates the 3D thermal-flied of end-winding and core section of Three-gorge hydrogenerator stator.It is shown that the method is valid because the result of calculation is fit to the flied data.The temperature of tooth of stator core is higher than that of yoke of stator core;the temperature between the upper-bar and the lower-bar is greatly influenced by the temperature of cooling-water,and is approximately equal to the average of maximum temperatures of upper-bar and the lower-bar;95.66% of copper-loss and 25% of core-loss of stator are taken away by the cooling-water,so the cooling effect of cooling-water is vital for the half-cooled hydrogenerator.更多还原