汽轮发电机滑环与碳刷之间的摩擦造成滑环表面温度升高。采用流热耦合模型计算滑环表面的温度分布，通过分析滑环外侧气流分布与滑环温度分布的对应关系，提出在无碳刷区域滑环上方布置多排孔笛型管，强化滑环表面对流换热。计算结果表明：笛型通道沿滑环重新分配风机流量，并在笛型管孔口下方形成射流，直接冲击滑环表面，发挥强化换热作用；通风结构优化后，滑环碳刷的接触点最高温度降低了28.3%，平均温度降低了29%。

Because of the friction between turbogenerator slip ring and carbon brushes,the slip ring surface becomes over heated.A coupled calculation model of flow and heat transfer is used to calculate the temperature distribution over the slip ring surface.Through analyzing the corresponding relationship between the air flow distributions outside the slip ring and temperature distribution over the slip ring,we propose a flutelike ventilation tube structure with multirow holes arranged on the upper part of slip ring in brushless region to strengthen the heat convection over the slip ring surface.The calculated results show that the flute channel redistributes the fan flow along the slip ring,the jet flow is formed at the lower part of flute pipe hole,which impinges the slip ring surface directly,playing the role of strengthening heat transfer.With the optimized ventilation structure,the maximum temperature value on the contact points of slip ring carbon brushes is reduced by 28.3%,the average temperature is reduced by 29%.

TK221

国家自然科学基金（52006147）