Temperature field analysis of an air-water composite cooling high-speed generator

IF 6.4 2区 工程技术 Q1 THERMODYNAMICS
Tang Chenqi, Yu Zhongjun, Fu Jia, Yang Juntan, Jiang Hao
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引用次数: 0

Abstract

With the increase in the power density of the generator, the operation safety and the service life of the generator are increasingly affected by its internal temperature rise. For high-speed hybrid excitation synchronous generators, the stator includes armature windings and annular excitation windings, which makes heat dissipation difficult and requires the design of an efficient heat dissipation structure. An air-water composite cooling structure is proposed for this purpose. The air-cooled section is a cooling structure with inlets at both sides and radial ventilation. The water-cooled section includes cooling water pipes.
To better analyze the generator's flow field, a model of the water pipe is established to study the flow characteristics of the cooling water inside the pipes. In addition, a model of the air is established, and its flow characteristics inside the generator are analyzed. To better evaluate the cooling effect, simplified models are established to compare and analyze the temperature field of generators with the air-cooled, water-cooled, and air-water composite cooling structures. The influence of the ventilation area on the stator back on the flow and temperature fields is studied. The results indicate that it’s appropriate to select 2.09 m/s as the inlet flow rate, and the pressure difference is 74508.19Pa. The airflow at the back of the stator is the highest, nearly 2.4 times higher than that at the air gap. The heat dissipation requirement cannot be achieved alone by the air-cooled or water-cooled structure, but it can be done by the air-water composite cooling structure. Under the condition that the heat dissipation requirement is met, the required air-cooled pressure can be reduced by appropriately increasing the ventilation area on the stator back. Finally, the reliability of the simulation results is verified through experimental results.
空气-水复合冷却高速发电机温度场分析
随着发电机功率密度的增大,发电机的运行安全和使用寿命越来越受到其内部温升的影响。对于高速混合励磁同步发电机,定子包括电枢绕组和环形励磁绕组,散热困难,需要设计高效的散热结构。为此提出了一种空气-水复合冷却结构。风冷段是一种两侧有进气口、径向通风的冷却结构。水冷段包括冷却水管。
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来源期刊
Case Studies in Thermal Engineering
Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
8.60
自引率
11.80%
发文量
812
审稿时长
76 days
期刊介绍: Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.
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