转套式配流系统闭死角对工作脉动的影响研究
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摘要
为了降低转套式配流系统在转换过程中出现的冲击现象和噪声,本文根据配流系统配流特征,分析了泵腔在两个阶段中闭死升压和降压的数学模型。同时,为改善配流系统工作中液压冲击现象,选取最佳闭死角,并利用仿真软件Fluent,对配流系统工作循环中流量和压力变化进行数值模拟。仿真结果表明,当闭死压缩角为3°时,对流量特性及泵腔压力脉动的影响最小,且最接近理论分析;在任意膨胀阶段,泵腔内部都出现了不同程度的空化现象,且膨胀角越小,流量脉动越大,综合考虑膨胀角选取2°最合适。该研究为转套式配流系统确定闭死角的大小提供了理论依据。
In order to decrease impact and noise in the conversion process of rotating-sleeve distributing-flow system,the mathematical models of pre-loading and pre-depressurization in piston pump are established based on distributing-flow characteristics.And we choose the best dead angle and simulate the distributing flow fluid model using software Fluent to improve the hydraulic shock.As a consequence,the results show that the compression angle 3° is closest to theoretical value and has the minimum influence on flow and pump pressure characteristic.On the other hand,pump chamber appears cavitation phenomenon on a certain degree and the flow pulsation is smaller with greater expansion angle.So the expansion angle 2° is more suitable to distributingflow system.The study concretely provides the theoretical foundation for ensuring the size of closed angle.
In order to decrease impact and noise in the conversion process of rotating-sleeve distributing-flow system,the mathematical models of pre-loading and pre-depressurization in piston pump are established based on distributing-flow characteristics.And we choose the best dead angle and simulate the distributing flow fluid model using software Fluent to improve the hydraulic shock.As a consequence,the results show that the compression angle 3° is closest to theoretical value and has the minimum influence on flow and pump pressure characteristic.On the other hand,pump chamber appears cavitation phenomenon on a certain degree and the flow pulsation is smaller with greater expansion angle.So the expansion angle 2° is more suitable to distributingflow system.The study concretely provides the theoretical foundation for ensuring the size of closed angle.
引文
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[19]Manring N D,Zhang Y H.The Improved Volumetric-Efficiency of an Axial Piston Pump Utilizing a Trapped-Volume Design[J].Journal of Dynamic Systems Measurement and Control,2001,123(1):479-487.
[20]王志坚,佟亮,李璐璐,等.基于CFD的离心泵内部三维流动数值模拟和性能预测[J].流体机械,2012,40(6):14-18.
[2]Zhang B,Xu B,Xia C L,et al.Modeling and Simulation on Axial Piston Pump Based on Virtual Prototype Technology[J].Chinese Journal of Mechanical Engineering,2009,22(1):84-90.
[3]张洪信,张铁柱,赵红,等.单缸轴向内燃泵工作过程与性能模拟研究[J].流体机械,2007,35(3):1-5.
[4]Zhang H X,Zhang T Z,Wang Y S,et al.Dynamic Model and Simulation Offlat Valve System of Internal Combustion Water Pump[J].Chinese Journal of Mechanical Engineering,2005,18(3):411-414.
[5]徐威,张洪信,舒培,等.缸间齿轮联动液压发动机柱塞泵运动学研究[J].机械传动,2016,40(5):5-9.
[6]Lim G H,Chua P S K,He Y B.Modern Water Hydraulics-the New Energy-Transmission Technology in Fluid Power[J].Applied Energy,2003,76(1):239-246.
[7]王震,聂松林,尹方龙,等.基于PumpLinx纯水轴向柱塞泵配流盘卸荷槽结构的仿真分析[J].液压与气动,2016(2):11-16.
[8]张洪信,程联军,张铁柱,等.往复柱塞泵转套式配流系统的结构原理[J].流体机械,2015,43(8):48-51.
[9]马吉恩,徐兵,杨华勇.轴向柱塞泵流量特性理论建模与试验分析[J].农业机械学报,2010,41(1):188-194.
[10]于立娟,王小东,张学成.轴向柱塞泵流量脉动主动控制方法及仿真研究[J].西安交通大学学报,2013,47(11):43-47.
[11]张延君,张洪信,赵清海,等.往复柱塞泵转套式配流系统泵腔流场仿真研究[J].液压与气动,2016,40(11):31-35.
[12]尹方龙,聂松林.水压轴向柱塞泵配流盘预升压角[J].北京工业大学学报,2015,41(9):1281-1288.
[13]Xu B,Song Y C,Yang H Y.Pre-Compression Volume on Flow Ripple Reduction of a Piston Pump[J].Chinese Journal of Mechanical Engineering,2013,26(6):1259-1266.
[14]阮俊,聂松林,刘卫,等.封闭加压型配流盘高压范围角研究[J].液压与气动,2010,22(9):74-77.
[15]那成烈.轴向柱塞泵可压缩流体配流原理[M].北京:兵器工业出版社,2003.
[16]那成烈.轴向柱塞泵带有减震槽的非对称正遮盖度配流盘的最佳设计[J].工程机械,1985,3(4):29-37.
[17]徐礼林.轴向柱塞泵配流机构过流面积分析及计算[J].机床与液压,2011,39(24):54-56.
[18]马吉恩,徐兵,杨华勇.轴向柱塞泵流量特性理论建模与试验分析[J].农业机械学报,2010,41(1):188-194.
[19]Manring N D,Zhang Y H.The Improved Volumetric-Efficiency of an Axial Piston Pump Utilizing a Trapped-Volume Design[J].Journal of Dynamic Systems Measurement and Control,2001,123(1):479-487.
[20]王志坚,佟亮,李璐璐,等.基于CFD的离心泵内部三维流动数值模拟和性能预测[J].流体机械,2012,40(6):14-18.