摘要
针对2.5 MW风力发电机空空冷却器进行了数值模拟研究,对比了空空冷却器采用光滑管、螺纹管时的传热性能、阻力特性及综合性能,分析了螺纹管螺距p、槽深e及螺纹形状等因素对空空冷却器传热和阻力特性的影响规律。研究表明:对于风力发电机空空冷却器采用螺纹换热管可以有效提高冷却性能,且在高雷诺数下,冷却器的传热性能提升幅度更为显著;增加槽深e和减小螺距p都可以有效提升传热性能;采用冷却器综合性能评价准则数Nu/f1/3进行评价时,螺距与槽深的比值p/e宜取在10~20之间,且优先考虑半圆形螺纹,其次考虑矩形螺纹。
In this article,the 2.5 MW wind turbine’s air-to-air cooler is subject to numerical simulation.The comparative analysis is conducted on heat-transfer performance,drag coefficient,and comprehensive performance when the smooth and threaded tubes are adopted.Efforts are made to explore the effect of such factors as the threaded tube’s pitch p,groove depth e,and shape on the air-toair cooler’s heat transfer and resistance characteristics.The results show that thanks to the threaded heat-exchange tubes,the wind turbine’s air-to-air cooler enjoys better cooling performance.With high Reynolds numbers,heat-transfer performance witnesses the most significant increase;both increasing the groove depth e and decreasing the pitch p ensure a higher standard of heat-transfer performance;when the number of the air-to-air cooler’s comprehensive performance evaluation criteria Nu/f1/3 is adopted,the ratio of the pitch to the groove depth p/e should be 10~20;priorities should be given to semi-circular threads,and then to rectangular threads.
作者
周年勇
王庆荣
段锋
徐慕豪
郭强
周留华
ZHOU Nian-yong;WANG Qing-rong;DUAN Feng;XU Mu-hao;GUO Qiang;ZHOU Liu-hua(School of Petroleum Engineering,University of Changzhou,Changzhou 213016;Changzhou You Gu New Energy Technology Co.,Ltd.,Changzhou 213031)
出处
《机械设计》
CSCD
北大核心
2020年第12期90-96,共7页
Journal of Machine Design
基金
江苏省自然科学基金(BK20180960)。
关键词
风力发电机
空空冷却器
数值模拟
螺纹管
wind turbine
air-to-air cooler
numerical simulation
threaded tube
