轴流泵内部流场的二维粒子成像测速试验

为研究0.8Qopt工况下,叶轮及导叶进出口的流场分布情况,选择比转速ns=700的轴流泵进行模型缩放,并对其进行结构改造,以得到能够适合于2D-PIV内部流场测试的试验台。结构改造包括：采用透明的有机玻璃材料代替传统金属材料,达到内部可视化的目的;将传统的锥形扩散式导叶体设计成圆柱状,以减小光学折射的复杂程度;合并转轮室及导叶外筒壁,使之成为一个整体,以消除叶轮区域与导叶区域之间法兰对内部流场的遮挡;将导叶内轴承后移,并加装筋板,使得载荷能够顺利传递到基础中。综合以上手段,成功改造了试验泵段。在PIV试验过程中,利用轴编码器及同步装置,取得了很好的同步效果。同时,以有机玻璃空心球作为示踪粒子...

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Bibliographic Details
Published in农业工程学报 Vol. 29; no. 23; pp. 93 - 98
Main Author 张华 施卫东 陈斌 张德胜 胡啟祥
Format Journal Article
LanguageChinese
Published 江苏大学流体机械工程技术研究中心,镇江,212013%合肥工业大学化工机械研究所,合肥,230009 2013
Subjects
PIV
叶顶泄漏
小流量
泵
泵段改造
流场
试验
轴向漩涡
轴流泵
轴流泵
transformation of pump section
试验
轴向漩涡
pumps
tip leakage
泵段改造
流场
experiment
泵
low flow condition
axial vortex
axial flow pump
小流量
flow field
PIV
叶顶泄漏
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ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2013.23.013

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Summary:为研究0.8Qopt工况下,叶轮及导叶进出口的流场分布情况,选择比转速ns=700的轴流泵进行模型缩放,并对其进行结构改造,以得到能够适合于2D-PIV内部流场测试的试验台。结构改造包括：采用透明的有机玻璃材料代替传统金属材料,达到内部可视化的目的;将传统的锥形扩散式导叶体设计成圆柱状,以减小光学折射的复杂程度;合并转轮室及导叶外筒壁,使之成为一个整体,以消除叶轮区域与导叶区域之间法兰对内部流场的遮挡;将导叶内轴承后移,并加装筋板,使得载荷能够顺利传递到基础中。综合以上手段,成功改造了试验泵段。在PIV试验过程中,利用轴编码器及同步装置,取得了很好的同步效果。同时,以有机玻璃空心球作为示踪粒子,配合新的标定方式,取得了理想的试验效果。从试验结果分析可知：在0.8Qopt流量下,叶轮进口边外缘处受叶顶泄漏影响,使得该处来流向轮毂侧偏转,但叶轮进口前端截面上的流场整体分布较为均匀;叶轮轮毂与导叶轮毂之间存在的顺时针方向漩涡,对叶轮出口边根部附近的流场造成较大的影响,且叶轮出口边与导叶进口边轴向间隙内的流场具有整体向外缘偏转的趋势;导叶出口以后的流线方向则向轮毂侧偏转,且在出口边外缘处出现局部高速区域。
Bibliography:11-2047/S
To investigate the flow field distribution at the regions of the impeller and guide vane inlet and outlet under condition of 0.8Qopt, the axial flow pump with ns =700 was selected for model scaling and structural modification, from which we could get a test bed suitable for a 2D-PIV internal flow field test. Structural modifications included： the conventional metal material was replaced with transparent organic glass material to achieve the purpose of internal visualization; the conventional conical diffuser vane was designed into cylindrical shape to reduce the complexity of optical refraction; the runner chamber was merged with a guide vane casing to form as a whole to eliminate the occlusion of the flange to an internal flow field between the region of impeller and diffuser vane; the bearing within the diffuser vane was moved backward and rib plates were installed to make the load transfer to foundation smoothly. Based on the above methods, an experiment pump section was modified successfully, and
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2013.23.013