摘要
为实现蒸发冷却汽轮发电机冷凝器的优化设计,以eC21F为蒸发冷却介质,对不同结构的强化管管束的凝结换热性能进行了试验研究。结果表明:翅片管和光管相比,具有显著的强化传热能力,适当地提高冷却水流速和降低冷却水入口温度,可以提高传热系数,但也相应地增大了液膜厚度,不可能无限制地提高传热系数,因此,要根据实际情况选择合适的流速和入口水温,以实现冷凝器的传热优化,更好地满足汽轮发电机的实际运行工况的需要。
For the optimizing design of the condenser for an evaporative cooling turbo-generator, the experimental study was conducted to condensation heat transfer performance of tubes which have different enhancement structures on heat transfer with eC21E which act as cooling medium. The results indicate that, comparing with the smooth tubes, the finned tubes have marked heat transfer augmentation capability; With reducing inlet temperature and increasing flow velocity of the cooling water suitably, the heat transfer coefficient may enhance, but correspondingly the fluid film thickness also increase, so it is impossible to enhance the heat transfer coefficient unlimitedly. Therefore, the reasonable arrangement of the inlet temperature and flow velocity is quite important for the optimization of the heat transfer to meet the actual operating conditions of turbo-generators.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第32期71-75,共5页
Proceedings of the CSEE
关键词
汽轮发电机
蒸发冷却
冷凝器
传热系数
液膜厚度
turbo-generator
evaporative cooling
condenser
heat transfer coefficient
liquid film thickness
