摘要
运用球形五孔探针对自行设计的轴流模型泵3种工况下叶轮出口流场进行了测量,得到叶轮出口绝对速度的周向、轴向、径向速度分量和速度环量分布。测量结果分析表明:叶轮出口处流场呈螺旋形向外运动趋势;在最优工况下,出口旋转动能占出口总动能的34%左右,其比例随着流量的增加逐渐减小;绝对速度的径向分量较小,轴向分量随着流量的增加而加大,和设计假设相吻合;叶轮出口速度环量从轮毂到轮缘呈逐渐下降的趋势,设计时应增加轮缘处的圆周分量,减小轮毂处的圆周分量。运用球形五孔探针测量三维流场中的速度分量和速度环量分布,具有适用性强、方法简单、测量精度较高的优点。
The flow field at the outlet of impeller in the designed axial-flow pump was measured by using the five-hole probe.Three velocity components and circulation curves were obtained.The measured results show that the flow field at the outlet of impeller is a spiral movement.Under the optimum condition,the rotary kinetic energy occupies 34% of the total outlet kinetic energy and decreases with the increase of the flux.Accompanied by the small radial velocity,the axial velocity increases with the flow intensifying.The velocity circulation decrease from the hub to the flange,wherefore the more circular velocity at the flange and the less at the hub are needed.The 3-D velocity distribution of flow field can be measured accurately by the probe.This method has the merits of simple operation and well applicability.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2009年第9期94-97,共4页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(50776040)
关键词
轴流泵
叶轮
测量
五孔探针
速度环量
Axial-flow pump
Impeller
Measurement
Five-hole probe
Velocity circulation
