叶片数对离心泵叶轮失速特性影响研究

发布时间：2018-04-27 21:09

本文选题：离心泵 + 叶片数　；参考：《机械工程学报》2016年10期

【摘要】：为研究叶片数对离心泵叶轮失速特性的影响,以4种不同叶片数的离心泵叶轮为研究对象,采用改进的亚格子模型(Sub-grid scale model,SGS)对叶轮的内部流场进行数值模拟,得到不同叶片数的失速团的运动规律,以及失速频率、失速团个数、转速等特性参数。研究表明,叶片数对叶轮内部失速团的类型有显著影响,当叶片数为偶数时,会发生"交替失速"流动现象;当叶片数为奇数时,会发生"旋转失速"流动现象。另外,叶片数对失速团特征参数也有一定影响。当发生"交替失速"时,叶片数增多,失速团的数量也随之增多,失速频率也随之变化,4叶片叶轮失速团的失速频率约是6叶片的2.4倍;而当发生"旋转失速"时,叶片数增多,失速团的数量也随之增多,转速也随之增大,7叶片叶轮失速团的转速约是5叶片的1.8倍,失速频率是它的3.8倍。
[Abstract]:In order to study the effect of blade number on the stall characteristics of centrifugal pump impeller, four centrifugal pump impellers with different blade numbers were used to simulate the internal flow field of centrifugal pump impeller using Sub-grid scale model. The motion rules of stall clusters with different blade numbers, as well as the stall frequency, the number of stall clusters, the rotational speed and other characteristic parameters are obtained. The results show that the number of blades has a significant effect on the type of stall clusters in the impeller. When the number of blades is even, the phenomenon of "alternate stall" flow will occur, and when the number of blades is odd, the phenomenon of "rotational stall" will occur. In addition, the number of leaves also has a certain effect on the characteristic parameters of stall clusters. When "alternate stall" occurs, the number of blades increases and the number of stall clusters increases, and the stall frequency changes with it. The stall frequency of 4 blade impeller stall clusters is about 2.4 times of that of 6 blades, while when "rotating stall" occurs, the stall frequency is about 2.4 times higher than that of 6 blades. With the increase of the number of blades, the number of stall clusters also increased, and the rotational speed of stall cluster of blade No. 7 was about 1.8 times of that of 5 blades, and the stall frequency was 3.8 times of that of the five blades.
【作者单位】：中国农业大学水利与土木工程学院;浙江工业大学机械工程学院;
【基金】：国家自然科学基金重点(51139007,51321001) 国家科技支撑计划(2015BAD20B01)资助项目
【分类号】：TH311

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