Abstract: The characteristics of heat transfer and flow resistance of highly efficient water cooler which is composed of spirally fluted tubes and rod-baffles have close relation with its structure parameters.Experimental study on the influence of the flute depth of spirally fluted tube on heat transfer and flow resistance performance of the water cooler for turbo-generator stator was carried out.It was shown from the results that: the effect of shell side flow velocity on heat transfer coefficient was greater than that of tube side flow velocity, which meant that heat resistance on shell side was greater than that on the tube side.Hence, more attention should be paid to enhancement of heat transfer on the shell side in order to improve heat transfer performance of water cooler.Within the range of Reynolds number in this experiment, the flute depth of spirally fluted tube had a great effect on heat transfer coefficient of water cooler.A deeper flute led to higher heat transfer performance at the cost of increased flow resistance.At last, based on the experimental results, the correlations of heat transfer and flow resistance for water coolers with different structures were obtained.

Key words: 定子水冷器, 强化传热, 折流栅, 螺旋槽管

摘要： 螺旋槽管与折流栅组合的高效水冷器的传热和阻力特性与其管、壳程的结构因素密切相关，本文就螺旋槽管槽深对水冷器管、壳程传热与阻力特性的影响进行了实验研究.结果表明：壳程流速变化对水冷器传热系数的影响更加明显，即壳侧热阻相对较大，强化传热应以强化壳侧换热为主要目标;螺旋槽管槽深对水冷器传热系数的影响很大，应在实际工程设计中确保实际槽深符合设计要求;槽深越深，管壳程阻力也相应增加，即传热的强化是以阻力增加为代价.根据实验结果还得到了不同结构水冷器的管、壳程换热与阻力计算关联式.

关键词: 定子水冷器, 强化传热, 折流栅, 螺旋槽管