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当前位置: 首页 > 文章 > 不同流量工况下斜流泵内部流场PIV试验 农业机械学报 2016,47 (6) 27-33
Position: Home > Articles > PIV Experiment on Internal Flow Field of Mixed-flow Pump under Different Flow Conditions Transactions of the Chinese Society for Agricultural Machinery 2016,47 (6) 27-33

不同流量工况下斜流泵内部流场PIV试验

作  者：
施卫东;季磊磊;李伟;邵佩佩;李维强;蒋小平
单  位：
江苏大学流体机械工程技术研究中心
关键词：
斜流泵;多工况;涡量;粒子图像测速
摘  要：
为了探索斜流泵的内部流动特性并优化斜流泵设计,基于粒子图像测速技术(PIV)对斜流泵内部流场进行测量,分析了不同相位叶轮截面处的流线和速度分布以及小流量工况下的涡量分布。研究结果表明,在小流量工况下,由于受到叶片压力面旋涡流动和吸力面脱流的影响,叶轮内部的流动呈现径向运动趋势,且流动紊乱;随着流量增大,叶轮流场流线逐渐向轴向方向移动并沿着轮毂轮廓线流动,在大流量工况下叶片压力面附近靠近端壁处形成明显的旋涡结构。0.6倍流量工况下,当叶轮进口进入拍摄断面时,在叶轮内部形成一个顺时针旋转的负涡;当叶轮出口进入拍摄断面时,在导叶进口外缘出现正向涡量集中区域,且随着叶轮的转动该区域向导叶进口方向移动;当叶片出口远离拍摄断面时,在导叶进口处出现负涡量区,揭示了斜流泵叶轮和导叶动静相干过程中能量损失的内在原因。
译  名：
PIV Experiment on Internal Flow Field of Mixed-flow Pump under Different Flow Conditions
作  者：
Shi Weidong;Ji Leilei;Li Wei;Shao Peipei;Li Weiqiang;Jiang Xiaoping;Research Center of Fluid Machinery Engineering and Technology,Jiangsu University;National Research Center of Pumps,Jiangsu University;
关键词：
mixed-flow pump;;multi-conditions;;vorticity;;particle image velocimetry
摘  要：
In order to explore the internal flow characteristics of mixed-flow pump and optimize and improve the design method of the mixed-flow impeller and guide vane,the internal flow field of mixedflow pump was measured based on the particle image velocimetry( PIV). The streamline and velocity distribution of impeller section at different phases and the vorticity distribution under small flow rate conditions were analyzed. The results showed that radial trend of flow was appeared in the impeller due to influence of vortex flow on the blade pressure surface and flow separation of suction surface under small flow rate conditions,and the flow was turbulent. With the increase of flow rate,the streamline was turned gradually in the axial direction and flows along with the contour line of hub. Under the large flow rate conditions,the vortex structures near blade pressure surface and close to the wall were obvious. At 0. 6times of the working condition,when impeller inlet came to the shooting section,clockwise rotation vortex was formed within the impeller; when impeller outlet came to the shooting section,the positive vorticity concentrated area appeared near the guide vane inlet edge and this region was moved in the inlet direction with rotation of impeller. When the blade outlet kept away from the shooting section,the negative vorticity concentrated area was appeared near the guide vane inlet. The causes of mixed-flow pump energyloss were revealed during the process of rotor-stator interaction between impeller and guide vane. The research results provided reference for revealing the internal flow characteristics and expanding the operation ranges of the mixed-flow pump.

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