For a typical spiral groove dry gas seal, its heat transfer coefficient was calculated through numerical simulation and empirical formula separately. During the calculation, three influencing factors are considered. They are the axial thickness of gas film, rotational speed and inlet velocity of air in seal chamber. Results were compared and analyzed. The following conclusions are obtained. First, heat transfer coefficients calculated through numerical simulation and empirical formula are in the same order. However, numerical results contain more details than that of empirical formula. Second, the axial thickness of gas film and rotational speed both have great influence on heat transfer coefficient of wetted surface of rotating ring. Meanwhile, they both have very little influence on heat transfer coefficient of wetted surface of stationary ring. Third, with the increase of inlet velocity of air in seal chamber, the heat transfer coefficient of wetted surface of rotating ring increases and that of wetted surface of stationary ring decreases.%采用数值模拟和经验公式对一典型螺旋槽干气密封的对流传热系数进行计算,考虑气膜轴向厚度、转速和密封腔气体入口速度3个影响因素,比较和分析计算结果.结果表明:2种方法的对流传热系数量级相同,但数值结果比经验公式结果更加详细.气膜轴向厚度和转速均对动环润湿面对流传热系数的影响较大,对静环润湿面对流传热系数的影响非常小.密封腔气体入口速度增大,静环润湿面对流传热系数增大,而动环润湿面对流传热系数减小.
展开▼
