基于RANS模型的不同边界条件风机三维流场模型应用研究  

Research on the application of three-dimensional flow field models for fans with different boundary conditions based on RANS model

作　　者：司翔 许淑惠[1,2] 徐荣吉 沃龙[1] SI Xiang;XU Shuhui;XU Rongji;WO Long(Beijing University of Civil Engineering and Architecture;Beijing Engineering Research Center of Sustainable Energy and Buildings,Beijing 100044,China)

机构地区：[1]北京建筑大学,北京102616 [2]北京市建筑能源高效综合利用工程技术研究中心,北京100044

出　　处：《流体机械》2023年第6期81-89,97,共10页Fluid Machinery

基　　金：国家自然科学基金项目(51506004);北京市自然科学基金项目(3162009)。

摘　　要：为了更加真实地分析风机流场,并缩短数值计算时间,分别建立不同参数(尺寸、转速)的轴流风机的三维流场模型,基于RANS模型中的Realizable k-ε模型,分别采用速度边界、Fan边界、3D Fan zone 3种边界条件对风机内部流场、射流通风流场进行稳态计算,并将计算结果与文献中风机试验数据进行了对比验证。为了进一步验证风机内部流场模拟结果的准确性,对1台SF3-4轴流式风机进行性能测试,结果表明:采用3D Fan zone和Fan边界条件计算内部流场的气动性能数据与试验值最接近,平均误差分别为1.59%和4.42%,但要求的网格数较多,计算时间长,而采用速度边界条件虽平均误差为10.3%,要求的网格数较少且计算时间短。在模拟风机射流通风流场时,采用3D Fan zone与Fan边界条件能实现流场边缘处的微小尺度旋流及流场各处的温度变化,而采用速度边界条件虽能实现流场中心处的大尺度射流,但无法实现流场其他位置的流动、传热现象;3种边界条件的计算结果都与风机内部流场的实际性能参数吻合度高,研究结果可为风机流场研究提供参考。In order to analyze the fan flow field more realistically and shorten the numerical calculation time,the three-dimensional flow field model of the axial fan with different parameters(size,speed)was established,based on the Realizable k-εmodel in the RANS model,the three boundary conditions of velocity boundary,Fan boundary and 3D Fan zone were used to carry out steadystate calculation of the internal flow field of the fan and the flow field of jet ventilation,and the calculation results were compared with and verified by the fan test data published in the literature.In order to further verify the accuracy of the simulation results of the internal flow field of the fan,a SF3-4 axial flow fan was tested for its performance.The results show that the aerodynamic performance data of the internal flow field calculated by the 3D Fan zone boundary conditions and the Fan boundary conditions are closest to the experimental values,and the average errors are 1.59%and 4.42%,respectively,but the required number of grids is large and the calculation time is long.While the velocity boundary condition has an average error of 10.3%,the required number of grids is small,resulting in a short calculation time.When simulating the fan jet ventilation flow field,the 3D Fan zone boundary condition and the Fan boundary condition can be used to realize the micro-scale swirl at the edge of the flow field and temperature change in the flow field;although by using the velocity boundary condition,the large-scale jet in the center of the flow field can be realized,the flow and heat transfer phenomena in other parts of the flow field cannot be realized.The results show that the calculated results of the three boundary conditions are in good agreement with the actual performance parameters of the internal flow field of the fan.The research results provide a reference for the numerical simulation study of the fan flow field.

关 键 词：风机 数值模拟 边界条件 气动性能 

分 类 号：TH43[机械工程—机械制造及自动化]