摘要
针对变压器内部过热问题,研究片式散热器散热效率的提升措施。为此搭建竖壁降膜模拟实验平台,并进行不同喷淋孔间距和射流入射角的对比实验,得出结果:相比喷淋孔间距为3.4 cm,喷淋孔间距为1 cm所测得的液膜覆盖率提高约50%;相比90°入射角,45°入射角所测得的液膜覆盖率提高约60%。同时,根据模拟实验结果设计了2种在运变压器的喷淋实验,结果表明:相比不淋水实验,普通喷淋和改进喷淋实验测得的散热器出油口降温幅度分别为9.2 K和11.2 K。改进喷淋方案通过提高散热器外壁的液膜覆盖率,增大水膜与外壁的对流换热量,使得降温幅度提高了2 K。
In order to solve the problem of overheating in the transformer,this paper studies measures to improve the heat dissipation efficiency of the panel-type radiator.The vertical wall film simulation experiment platform was built,and then a comparative experiment between different spray hole distances and jet incident angels was carried out.The results show that compared with spray holes distance of 3.4 cm,the coverage rate of liquid film by 1 cm is increased by about 50%,and the coverage rate of liquid film measured at a 45°incident angle is increased by about 60%compared with 90°incident angle.Then,spray experiments of two kinds of transformers in operation were designed according to the simulation results.The experimental results show that compared with the non-spray scheme,the scales of temperature drop of the radiator oil-out measured by ordinary spray and improved spray experiments are 9.2 K and 11.2 K respectively.The improved spray scheme increases the cooling range by 2 K by improving the coverage rate of the liquid film and increasing increases the convection heat transfer between the water film and the outer wall.
作者
李春
刘纪堂
章浩
林碧仁
黎进光
许云宇
刘刚
LI Chun;LIU Jitang;ZHANG Hao;LIN Biren;LI Jinguang;XU Yunyu;LIU Gang(Dongguan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Dongguan,Guangdong 523000,China;School of Electric Power,South China University of Technology,Guangzhou,Guangdong 510641,China)
出处
《广东电力》
2021年第5期114-121,共8页
Guangdong Electric Power
基金
广东电网有限责任公司科技项目(031900KK52180153)。
关键词
变压器
散热器出口油温
喷淋装置
竖壁降膜
射流
transformer
radiator outlet oil temperature
spray device
vertical wall falling film
jet flow
