抛雪离心风机蜗壳内部流场分析  

Internal Flow Field Analysis of Spiral Case of Centrifugal Fan Used for Throwing Snow

作　　者：琚立颖 冯泽[2] 张桓 龙海洋 JU Li-ying FENG Ze ZHANG Huan LONG Hai-yang(College of Mechanical Engineering, North China University of Science and Technology, Tangshan H ebei 063210, China College of Mechanical and Electrical Engineering, Hebei University of Engineering, Handan Hebei 056038, China)

机构地区：[1]华北理工大学机械工程学院,河北唐山063210 [2]河北工程大学机电工程学院,河北邯郸056038

出　　处：《华北理工大学学报（自然科学版）》2017年第2期82-91,共10页Journal of North China University of Science and Technology：Natural Science Edition

基　　金：河北省科技支撑计划项目(10215616D);唐山市电动汽车重点实验室建设项目(13130219A)

摘　　要：在标准化离心风机的基础上设计了抛雪专用的型号为P4-35-01No.03的离心风机,为了保证风机蜗壳内流场结构更加合理,利用计算流体动力学软件分别对3种不同截面的蜗壳内部流场进行数值模拟,确定了流动比较平稳的梯形截面蜗壳。分析梯形截面蜗壳内部流场动力学特征,得到由于梯形截面和蜗壳本身共同的扩压作用,而使蜗壳内圆周方向上180°~315°范围内发生倒流现象以及流动的不通畅。在轴向上,由于靠近后盘处流体速度大于前盖和叶轮中心处,观察到将蜗壳进口处的雪颗粒速度提高到13.74~17.18 m/s范围内,能够明显抑制蜗壳内倒流现象,减小倒流对蜗壳内部流动的影响。因此提出增大蜗壳进口雪颗粒速度优化蜗壳内部流场的方案,这一方案与结论为今后的产品开发和流场数值模拟研究积累了有益的资料。According to the standardized centrifugal fan, a new centrifugal fan used to throw snow with a model of p4-35-01No.03 was designed.To ensure the internal flow field more reasonable, the three different sections were simulated by using computational fluid dynamics software.So confirm a kind of volute with the trapezoidal section which has stable internal flow.Analyzing dynamic characteristics of flow field in centrifugal fan volute on trapezoidal section, we observe that static pressure in volute increase sharply and back flow occur in the range of 180 degree to 315 degree on the circumferential direction of volute.All of this was result from the combined diffusing action between trapezoidal sections with centrifugal fan volute itself.In axial direction of volute, we can see that the velocity of snow in the disk is bigger than in centre of impeller and head of impeller, if increase the velocity of snow in the inlet of volute to the range of 13.74 m/s to 17.18 m/s, the phenomenon of back flow is remarkably suppressed, and reduce the influence to flow in the volute from back flow and expand the flow area.Putting forward the project of increasing velocity of snow in inlet of volute, which provide theoretical basis to further optimize the internal flow field of centrifugal fan.This project also accumulates useful data for new product development numerical simulation of flow filed in the future.

关 键 词：离心风机 蜗壳 流场 倒流 数值模拟 

分 类 号：TH432[机械工程—机械制造及自动化] U418.326[交通运输工程—道路与铁道工程]