摘要
目前水电机组向着单机大容量、高转速的趋势发展,发电机体积功率密度将进一步提升,转子的散热矛盾也逐渐凸显。为了验证相变液冷技术在转子上应用的可行性并分析其冷却效果,本文提出了一种转子励磁绕组全浸式蒸发冷却结构方案,通过搭建立式电机转子相变液冷实验研究平台对转子蒸发冷却系统流动与换热特性进行了测试,首先验证了该种冷却方式满足转子散热需求;其次采用实验测试与CFD仿真相结合的方式进一步分析验证了不同离心加速度下系统换热和流动特性,结果显示随离心加速度增大模拟磁极线圈温度由均匀分布转变为沿径向线性分布,随离心加速度增大循环流量由逐渐减小转变为与热流密度呈正比关系。研究结果可为蒸发冷却技术在大容量、高转速立式电机转子冷却领域的应用提供一种可行的思路及设计参考。
At present,hydropower units are developing towards the trend of single unit with large capacity and high speed.The volumetric power density of the generator will be further improved,and the contradiction of heat dissipation of the rotor will gradually become prominent.In order to verify the feasibility of the phase change liquid cooling technology applied to the rotor and analyze its cooling effect,this paper proposes a fully immersed evaporative cooling structure for the rotor excitation winding.The flow and heat transfer characteristics of the rotor evaporative cooling system were tested by setting up an experimental research platform for the phase change liquid cooling of the vertical generator rotor.Firstly,it is verified that the cooling method meets the rotor heat dissipation requirements.Secondly,the heat transfer and flow characteristics of the system under different centrifugal accelerations are further analyzed and verified by the combination of experimental testing and CFD simulation.The results show that as the centrifugal acceleration increases,the temperature of the simulated magnetic pole coil changes from uniform distribution to linear distribution along the radial direction,and the circulating flow rate changes from gradually decreasing to a direct proportional relationship with the heat flux density as the centrifugal acceleration increases.The research results can provide a feasible idea and design reference for the application of evaporative cooling technology in the field of large capacity and high speed vertical generator rotor cooling.
作者
赵晟
王宇
杨张斌
ZHAO Sheng;WANG Yu;YANG Zhangbin(Institute of Electrical Engineering Chinese Academy of Sciences,Beijing 100190,China;China Three Gorges Construction Engineering Corporation,Chengdu 610041,China)
出处
《电工电能新技术》
CSCD
北大核心
2023年第11期1-10,共10页
Advanced Technology of Electrical Engineering and Energy
基金
中国三峡建工(集团)有限公司科研项目(JGJD0322006)。
关键词
立式水轮发电机
转子
蒸发冷却
离心加速度
vertical generator
rotor
evaporative cooling
centrifugal acceleration
