风冷功率阀塔的热力性能仿真与测试分析

Simulation and Test Analysis of Thermal Performance of Air-cooling Power Valve Tower

以风冷功率阀塔为研究对象,运用用户自定义函数(UDF)功能将散热器、百叶窗、风机的性能测试曲线拟合函数方程加载入计算流体力学(CFD)软件,进行系统级的热力性能仿真计算,并与测试值进行对比分析。研究发现,功率阀塔各散热器间进风风速分布范围仿真值3.85~4.35 m/s与测试值3.65~4.2 m/s差异较小,风速不均匀度仿真值与测试值差值为0.09%,说明各散热器间进风风速分布相对均匀;对功率阀组进行红外测温,阀组①风冷散热器最高温度为57.2℃,阀组③散热器H_(7)、H_(8)处局部温度最高为62.8℃,与各散热器表面温度仿真值分布范围60.1~61.7℃比较,总体吻合度较好,热力性能不平衡性优良。验证了该仿真计算方法的精度,对后续类似风冷系统的研究设计具有借鉴作用。

The air-cooling power valve tower was taken as the research object.The performance test curve of heat sink,blinds,blower was fitted the function equation and then were loaded into the computational fluid dynamics(CFD)software by means of user-defined function(UDF).The simulation calculation results were compared with the test value.It was found that the deviation of inlet wind velocity distribution between the simulation value range from 3.85 m/s to 4.35 m/s and the test value range from 3.65 m/s to 4.2 m/s was close.The difference of wind velocity unevenness between the simulation and test was 0.09%.It indicated that the distribution of inlet wind speed between heat sinks was relatively uniform.The temperature of the power valve bank was detected with an infrared thermometer.The maximum temperature of the power valve bank①was 57.2℃.The maximum temperature of the heat sinks H_(7) and H_(8) of the power valve bank③was 62.8℃.Compared with the simulation value of the heat sinks temperature range from 60.1℃to 61.7℃,it was indicated that the surface temperature of heat sinks between simulation and test were consistent.The unbalanced of the thermal performance was excellent.The accuracy of the simulation methods was assessed,which proved to be a practicable design for the air-cooling system research.