摘要
对三副短叶片不同偏置的低比转数复合叶轮离心泵,应用粒子图像速度仪分别测试大流量、设计流量和小流量三种工况下长短叶片叶轮同一叶槽内的瞬时流场。分析叶槽内相对速度矢量、速度等值线的特征,揭示短叶片不同偏置时的速度分布规律。研究三副长短叶片复合叶轮出口处径向速度、切向速度、相对速度和相对液流角沿圆周的分布,测得与三副叶轮相对应的泵外特性曲线。测量结果表明,分流短叶片不同偏置对叶槽内流场的影响差异明显,当短叶片进口相对出口向压力面偏转时,叶轮出口相对速度分布很不均匀,短叶片工作面出口存在较大的低速区;与之相反,当短叶片进口相对出口向吸力面偏转时,叶轮出口速度分布较均匀,并且泵的扬程与流量曲线明显右移,大流量时,效率显著提高。
The particle image velocimetry（PIV） was applied to investigate the different flow patterns of three low specific speed centrifugal pump impeller with deviated short splitter vanes. At design load, maximum load and minimum load, the internal flow fields have been obtained respectively and the distributions of relative velocity have alse been revealed. The measurement result shows that the influence on flow fields is significant for three deviated short vane schemes. While the inlets of short splitter vanes rotate to the pressure sides of long vanes related to the outlets, the distribution of relative velocity near the outlet of impeller passage is not uniform and a low velocity zone exists in the vicinity of the outlet of short vane working side. On the contrary, if the inlets of short splitter vanes rotate to the suction sides of long vanes, the relative v elocity near the outlet is well-distributed and its water head and flux curves move right, the efficiency of the pump obviously rises up in accordance with large discharge quantity.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2008年第1期56-61,共6页
Journal of Mechanical Engineering
基金
江苏省高校自然科学基金(06KJB470126)
江苏省重点实验室开放基金(KJS02035)资助项目。
关键词
离心泵
粒子图像测速测量
长短叶片叶轮
Centrifugal pump Particle image velocimetry measurement Impeller with long and short vanes
