中文摘要：

为分析转子不同通风方案的冷却效果，以某大型空冷汽轮发电机转子为例，建立其端部绕组最长的单个线圈的物理模型，在各个通风段长度确定的情况下，改变进、出风口大小、位置及挡块布置。根据计算流体力学原理模拟额定工况转子内部流场及温度场，比较不同通风方案转子内部冷却介质流量分布、转子绕组最高温度以及温度分布的均匀性。研究结果表明，转子端部绕组风口位置决定了绕组内冷风路的长短、冷却风量大小、冷却介质温度分布及绕组温度分布。合理布置风口可增加进入转子绕组的冷却风量并调节进入各段绕组的进风百分比，保证转子在最高容许工作温度以下工作，并使转子温度分布较均匀。

英文摘要：

In order to analyze the cooling effect of different ventilation proposals in the rotor, a physical model of single coil of the longest end winding was established for a large air-cooled turbine generator ro- tor, which can change the size and location of inlet and outlet as well as the block layout in the case of determining each ventilation segment length. In order to compare the cooling medium flow distribution of different ventilation proposals in rotor, the maximum temperature of the rotor winding and the uniformity of temperature distribution, the rotor flow field and temperature field of the rated operating conditions were simulated according to the computational fluid dynamics principle. The results show that the air inlet position of the rotor end windings determines the length of winding air road, the flow of cooling air, and the temperature distributions of the cooling medium and the winding. Rational arrangement of air inlet can increase the air mass flow rate entering the rotor winding, adjust the percentage of air mass flow rate ente- ring each ventilation segment, ensure that the rotor worked at the temperature below the maximum allowa- ble operating temperature and make the rotor temperature distribution be uniform.