文献类型：期刊文献

中文题名：微型轴流风扇间隙流动分析

英文题名：Analysis of Flow in Tip Clearance of a Micro-axial Fan

作者：陈金鑫[1];赖焕新[1]

机构：[1]华东理工大学承压系统与安全教育部重点实验室,上海200237

年份：2013

卷号：39

期号：3

起止页码：356

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：上海市教委科研创新项目(10ZZ40)

语种：中文

中文关键词：微型轴流风扇;泄漏涡;分离涡;泄漏流速度;泄漏流量;叶顶卸载

外文关键词：micro-axial fan; tip-leakage-vortex; tip-separation-vortex; leakage flow velocity; leakage flow rate; blade tip unloading

摘要：以某微型轴流风扇为研究对象,测量了其在5 600r/min转速下的气动特性曲线,同时采用商用软件NUMECA模拟了在4种流量下该风扇叶轮内的三维流场,详细研究了泄漏涡和分离涡的结构、泄漏流速度的分布、叶片两侧的压差分布以及泄漏流对叶顶载荷的影响。研究结果显示:由于叶顶间隙的存在,气流在叶顶形成了分离涡;而泄漏流进入相邻通道后卷起形成泄漏涡。叶顶分离涡和泄漏涡的起始位置都随着流量的增加而向下游移动。从叶顶到外端壁方向,泄漏流速度的大小及其与叶片型线的夹角(θ)均呈现先增大后减小的趋势。间隙区域叶片两侧的压差(Δp)随着流量的增加而变小,泄漏流速度、泄漏流量也随之变小。叶顶卸载是顶端间隙流动的主要特征,随着流量系数的增加,叶顶卸载变大。
In order to understand the flow details in the tip clearance of a micro-axial fan, the aerodynamie performance at the rotation velocity of 5 600 r/rain is experimentally measured, and the threedimensional flow fields at 4 flow rates are simulated numerically using a commercial software, the NUMECA. The structure of the tip-leakage-vortex and the tip-separation-vortex, the flow rate distribution of the tip-leakage-vortex, the pressure difference distribution between the two sizes of the blade, and the effect of the tip-leakage-vortex on the blade tip load are investigated in detail. It is revealed that the tip-leakage-vortex and the tip-separation-vortex are identifiable near the tip region, due to the blade tip clearance. As the flow rate increases, the positions where the two vortices occur move downstream. The difference of pressure across the blade tip decreases with the flow-rate. From the tip to the outer side wall, the size of the leakage flow speed and the angle of the blade profile （8） first increase and then decrease. The differential pressure （△p） on both sides of the blade gap region decreases with the increase of the flow rate, while the leakage flow velocity and rate decrease. Unloading at the blade tip as the major feature of the pressure field enhances when the flow rate increases.