排灌机械工程学报
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排灌机械工程学报  2019, Vol. 37 Issue (4): 307-312    DOI: 10.3969/j.issn.1674-8530.17.0186
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外啮合斜齿轮高压泵的CFD数值模拟
刘坤1,徐雷1*,杨波2,刘蕴1
1. 四川大学制造科学与工程学院, 四川 成都610000; 2. 四川长江液压件有限责任公司, 四川 泸州646000
Numerical simulation of high-pressure pump with CFD
LIU Kun1,XU Lei1*,YANG Bo2,LIU Yun1
1. School of Manufacturing Science and Engineering, Sichuan University, Chengdu, Sichuan 610000, China; 2. Sichuan Changjiang Hydraulic Parts Co. Ltd., Luzhou, Sichuan 646000, China
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摘要 为研究流量脉动系数对外啮合斜齿轮高压泵内部流场的影响,通过理论推导流量脉动系数的计算公式,分析螺旋角对流量脉动系数的影响,并结合计算流体力学(CFD),对外啮合斜齿轮高压泵的流场进行数值模拟,得到高压泵在不同转速、不同径向间隙下的压力脉动和流量特性.结果表明:增大螺旋角会减小流量脉动系数,有利于改善出口流量的品质,降低齿轮泵泄漏;另外,转速和径向间隙在一定范围内增大时,脉动系数逐渐减小,泄漏涡强度也会减小.当转速和径向间隙继续增大时,脉动系数趋于平稳波动;转速增大时,啮合区域的压力变化较大,但是靠近泵腔壁处的齿轮压强变化较小;径向间隙增大时,泄漏流动和泄漏涡强度会降低,在设计中适当增大转速和径向间隙可以改善出口流量品质.研究高压泵内部流场的运动规律和流量脉动特性对于外啮合斜齿高压泵的设计和优化具有一定的参考价值.
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刘坤
徐雷*
杨波
刘蕴
关键词外啮合斜齿轮高压泵   数值模拟   流量脉动系数   压力脉动   泄漏     
Abstract: In order to study the influence of flow pulsation coefficient on the internal flow field of external helical gear high-pressure pump, the influence of the helix angle on the flow pulsation coefficient is analyzed by the theoretical formula. Combined with computational fluid dynamics(CFD),the numerical experiment of the flow field in the external gear helical gear was carried out, and the influe-nce of different speeds and radial clearances on the pressure pulsation and flow characteristics was ana-lyzed.The results show that the larger helix angle will reduce the flow pulsation coefficient, it is good for improving the quality of the outlet flow and reducing the gear pump leakage. Furthermore, when the speed and radial clearance increase within a certain range, the pulsation coefficient decreases and the leakage vortex intensity also decreases. When the rotational speed and radial clearance continue to increase, the pulsation coefficient tends to be stable.When the rotational speed increases, the pressure in the meshing area varies greatly, but the gear pressure near the pump wall changes little. On the other hand,when the radial clearance increases, the leakage flow and leakage vortex intensity will be reduced, the quality of outlet flow will also improved by increasing the speed and radial clearance. The study of the motion law and flow pulsation characteristics of the internal flow field of the high-pressure pump is of some reference value to the design and optimization of the external helical gear.
Key wordshigh-pressure helical gear pump   numerical simulation   flow pulsation coefficient   pressure pulsation   leakage   
收稿日期: 2017-08-15;
引用本文:   
刘坤,徐雷*,杨波等. 外啮合斜齿轮高压泵的CFD数值模拟[J]. 排灌机械工程学报, 2019, 37(4): 307-312.
LIU Kun-,XU Lei-*,YANG Bo- et al. Numerical simulation of high-pressure pump with CFD[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(4): 307-312.
 
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