大型轴流风机风量测试CFD模拟与实验研究

CFD Simulation and Experiment Research on the Test of Large Axial-flow Fan Airflow Rate

在大型轴流风机风量测试过程中发现:轴流风机入流断面所得测试数据比出流断面所得数据方差小、速度分布更加均匀。以南京地铁二号线A站端排风机作为研究对象,建立合适的物理数学模型,采用CFD模拟与实验测试的方法对此问题进行研究。对轴流风机运行频率在13 Hz～39 Hz之间的14种工况进行CFD模拟与实测,分析结果发现,轴流风机入流断面比出流断面速度场分布更加均匀;风量的模拟数据与实测数据的协相关系数ρ_r约等于1,表明轴流风机CFD模拟结果具有可靠性;14种频率工况下入流断面速度场最大值与平均值的差值在0.6m/s～1.9m/s之间,相对误差约为15%,表明风机频率在13 Hz～39 Hz之间时入流断面速度场分布都很均匀。因此在入流端断面进行大型轴流风机风量测试,所得结果会更加准确。

Found in the process of large axial flow fan airflow test：axial-flow fan airflow rate test data from the inflow section had smaller variance,and the velocity distribution was more uniform.In this paper,the Nanjing Metro Line A station side exhaust fan was taken as research subject,proper physical and mathematical model were established,the CFD simulation and experimental testing method were used to study on this matter.CFD simulation and tests were made under14 kinds of operating frequency between 13Hz-39Hz of the axial-flow fan,analysis of the results showed that：velocity field distribution of the inflow section was more uniform than the outflow section;The co-correlativity coefficient of the CFD simulated data and the testing data ws approximately equal to 1,which proved the reliability of axial flow fan CFD simulation result;Under the condition of 14 kinds of frequency,the maximum and average value of the inflow section velocity field were difference in 0.6 m/s-1.9 m/s,relative error was about 15%,showed that inflow section velocity field distribution was more uniform when the fan frequency was between 13 Hz-39 Hz.So the results would be more accurate if the inflow section was chosed to test the airflow rate of large axial-flow fan.