转速对涡旋液泵空化性能的影响
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摘要
基于空泡动力学和两相流理论,采用Schnerr-Sauer模型,运用动网格技术对涡旋式液泵不同转速下的空化特性进行了数值模拟,得到不同转角下流场内空化发生位置和强度随着转速的变化规律,以及气液相的分布情况。结果表明:涡旋液泵低转速时不易发生空化,随着转速的增加,空化加剧且多发生在啮合间隙处及吸液腔内,转角较大时在动盘外壁面处也有较为严重的空化发生;随着转速的增大,泵进口流量增大,由于空化的加剧效率降低。
Based on cavitation bubble dynamics and two-phase flow theory and using Schnerr-Sauer cavitation model,numerical simulation was carried out on the cavitation characteristics of scroll hydraulic pump at different rotational speed using the dynamic mesh technology,and the change law of position and intensity of cavitation in the flow field with rotational speed and the distribution of gas-liquid phase were obtained. The results show that cavitation is not easy to occur when the scroll hydraulic pump runs at low rotational speed,with the increase of rotational speed,the cavitation is aggravated and mainly occurs at the mesh clearance and in the suction chamber,and when the rotational angle is relatively big,relatively severe cavitation also occurs on the outside wall of the rotary scroll member;With the increase of the rotational speed,the flow rate at pump inlet increases,and the efficiency decreases due to the aggravation of cavitation.
Based on cavitation bubble dynamics and two-phase flow theory and using Schnerr-Sauer cavitation model,numerical simulation was carried out on the cavitation characteristics of scroll hydraulic pump at different rotational speed using the dynamic mesh technology,and the change law of position and intensity of cavitation in the flow field with rotational speed and the distribution of gas-liquid phase were obtained. The results show that cavitation is not easy to occur when the scroll hydraulic pump runs at low rotational speed,with the increase of rotational speed,the cavitation is aggravated and mainly occurs at the mesh clearance and in the suction chamber,and when the rotational angle is relatively big,relatively severe cavitation also occurs on the outside wall of the rotary scroll member;With the increase of the rotational speed,the flow rate at pump inlet increases,and the efficiency decreases due to the aggravation of cavitation.
引文
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[8]谭蔚,晋文娟,吴皓,等.刚性管对正方形排布管束流体弹性下稳定性的影响研究[J].压力容器,2016,33(3):1-7.
[9]刘丽艳,冯家祥,吴皓,等.换热器管束排列角对流体力的影响研究[J].压力容器,2016,33(12):13-19.
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[11]刘厚林,刘东喜,王勇,等.三种空化模型在离心泵空化流计算中的应用评价[J].农业工程学报,2012,28(16):54-59.
[2]Phichai KRITMAITREE,Mitsunobu AKIYAMA,Ryutaro HINO,et al.Analytical study of volumetric scroll pump for liquid hydrogen circulating system[J].Journal of Nuclear Science and Technology,2002,39(1):101-107.
[3]孙帅辉,黄益,郭鹏程,等.涡旋液泵内部非稳态流场的数值模拟[J].流体机械,2016,44(4):11-16.
[4]Sun S H,Guo P C,Huang Y,et al.Numerical analysis on the cavitation and unsteady flow in a scroll hydraulic pump[J].Material Science&Engineering Conference,2016,129(1):012028.
[5]王君,张晓慧,刘凯,等.新型涡旋式多相泵气液增压过程研究与设计理论[J].机械工程学报,2012,48(2):172-178.
[6]王君,王增丽.新型涡旋多相泵原理及其工作过程研究[J].工程热物理学报,2012,33(2):240-243.
[7]何秀华,邓许连,杨嵩,等.涡旋阀压电泵内部空化流动的数值分析[J].排灌机械,2009,27(6):352-356.
[8]谭蔚,晋文娟,吴皓,等.刚性管对正方形排布管束流体弹性下稳定性的影响研究[J].压力容器,2016,33(3):1-7.
[9]刘丽艳,冯家祥,吴皓,等.换热器管束排列角对流体力的影响研究[J].压力容器,2016,33(12):13-19.
[10]孙亚男,赵淑芳,李文香,等.不同预冷方式及贮藏温度对采后平菇保险效果的影响[J].包装与食品机械,2015,33(4):15-20.
[11]刘厚林,刘东喜,王勇,等.三种空化模型在离心泵空化流计算中的应用评价[J].农业工程学报,2012,28(16):54-59.