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当前位置: 首页 > 文章 > 轴流泵双驼峰特性与内流场测试研究 农业机械学报 2022,53 (1) 178-185
Position: Home > Articles > Research on Double Hump Phenomenon of Axial Flow Pump Transactions of the Chinese Society for Agricultural Machinery 2022,53 (1) 178-185

轴流泵双驼峰特性与内流场测试研究

作  者：
谢荣盛;华尔天;徐高欢;郭晓梅;杨帆;汤方平
单  位：
浙江水利水电学院机械与汽车工程学院;浙江工业大学机械工程学院;扬州大学江苏省水利动力工程重点实验室
关键词：
轴流泵;双驼峰;水力特性;流场测试
摘  要：
为研究轴流泵在小流量工况双驼峰区域下的水力稳定性,探讨轴流泵扬程-流量曲线稳定性与内流场特性的关系,针对一比转数为825的轴流泵进行了测试研究。依次通过外特性能量曲线测试、内流场示踪粒子高速摄像机拍摄、壁面压力脉动采集、叶轮进出口截面速度LDV测试,获取了叶轮在小流量工况下的内外水力特性。由能量特性结果发现轴流泵的扬程-流量曲线存在双驼峰现象:第1次驼峰出现在0.5Q_(BEP)～0.6Q_(BEP)之间,对应着进口轮缘侧的切向速度出现明显波动,速度环量剧增,同时压力脉动峰峰值出现极大值,结合内流场测试结果表明第1次驼峰与叶轮进口回流生成相关;第2次驼峰出现在0.33Q_(BEP)～0.4Q_(BEP)之间,叶轮进口回流已然生成,虽然强度不断增强,影响范围更广,但进口侧叶轮室壁面的压力脉动峰峰值不再增强,而出口侧叶轮室壁面的压力脉动峰峰值迅速增加,同时出口近轮毂及中间侧的速度分布明显恶化,回流区域增加,表明第2次驼峰与叶轮出口流场的剧烈变化相关。
译  名：
Research on Double Hump Phenomenon of Axial Flow Pump
作  者：
XIE Rongsheng;HUA Ertian;XU Gaohuan;GUO Xiaomei;YANG Fan;TANG Fangping;College of Mechanical Engineering, Zhejiang University of Technology;College of Mechanical and Automotive Engineering, Zhejiang University of Water Resources and Electric;Key Laboratory of Water Conservancy and Power Engineering of Jiangsu Province, Yangzhou University;
关键词：
axial flow pump;;double hump;;hydraulic characteristics;;flow field test
摘  要：
In order to research the hydraulic stability of axial flow pump in the double hump region under small flow conditions, the relationship between the head-flow curve of the axial flow pump and the characteristics of the internal flow field was discussed, and a test and research on an axial flow pump with a specific speed of 825 was carried out. The internal and external hydraulic characteristics of the impeller under small flow conditions were obtained through the characteristic energy curve test, the internal flow field tracer particle trajectory was captured by a high-speed camera, the wall pressure pulsation collection, and the impeller inlet and outlet section velocity measurement by LDV equipment. According to the results of energy characteristics, it was found that there was a double hump phenomenon in the head-flow curve of the axial flow pump. The first hump appeared between 0.5Q_(BEP) and 0.6Q_(BEP), corresponding to the tangential fluctuation of the speed on the side of the inlet flange, the rapid increase of the velocity circulation, and the extreme peak-to-peak pressure pulsation. The test results showed that the first hump was related to the generation of the impeller inlet reflux. The second hump occurred between 0.33Q_(BEP) and 0.4Q_(BEP), the test results showed that the second hump was related to the drastic changes in the flow field of the impeller outlet. The impeller inlet reflux was generated during the second hump formation, although the strength was increasing and the influence range was wider, the pressure pulsation peak-to-peak value on the wall of the inlet side of the impeller chamber was no longer increased. The pressure pulsation peak-to-peak value on the wall of the outlet side of the impeller chamber was increased rapidly, and the unevenness of the velocity distribution between the outlet hub and the blades was obviously deteriorated, the reflux area of impeller outlet was increased, which indicated that the second hump was related to the drastic changes in the flow field of the impeller outlet.

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