Effects of groove shape of notch on the flow characteristics of spool valve
Effects of groove shape of notch on the flow characteristics of spool valve
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DOI：
10.1016/j.enconman.2014.06.081
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发表时间：
2014-10-01
影响因子：
10.4
通讯作者：
Yuan, Feng-feng
中科院分区：
文献类型：
--
作者：
Ye, Yi;Yin, Chen-Bo;Yuan, Feng-feng
液压滑阀的槽口槽通常设计成各种形状，以满足其所需的流量特性。本文旨在通过计算流体动力学（CFD）和实验研究来阐明槽形对流动特性的影响。采用RNG k-ε湍流模型，对3种典型结构凹槽内流场的压力分布进行了数值模拟，分析了凹槽内限制位置沿着方向的变化，进而计算了凹槽内的流动面积。计算结果与实验数据的比较表明了所采用模型的准确性。此外，还对实验得到的流量与压降数据进行了最小二乘法拟合。在此基础上，推导出了流量系数随槽形、流动条件、拟合系数及其稳定值的变化关系，并与实验结果进行了比较。利用CFD模拟得到的射流角计算了定常流场力，计算结果与实验结果吻合较好。最后，研究了三种凹槽的节流刚度，其中发散U形槽的节流刚度介于球形槽和三角形槽之间，福尔斯槽的节流刚度最大。对于定常流力也有类似的结果。结果表明，槽形对滑阀的通流特性（通流面积、流量特性、射流角度、稳流力和节流刚度）有显著影响。(C)2014爱思唯尔有限公司版权所有。
The grooves of notches of hydraulic spool valves are usually designed into various shapes for their desired flow characteristics. The aim of this paper is to clarify the effects of the groove shape on the flow characteristics through computational fluid dynamics (CFD) and experimental investigations. The RNG k-epsilon turbulence model is used to simulate the pressure distributions of the flow fields inside three notches with their corresponding typical structural grooves in order to analyze the changes of restricted locations along with the openings and, furthermore, to calculate the flow areas of the notches. The accuracy of the employed model is demonstrated by comparing the computational results with the experimental data. Additionally, the flow rate vs. pressure drop data obtained from the experiment is fitted by least square method. On this basis, the discharge coefficient as a function of groove geometry, flow condition, fitting coefficients and its stable value is deduced, proving to be quite consistent with the experimental result. Thanks to the jet flow angles estimated by CFD simulation, the steady flow forces are calculated, which show good agreement with the experimental results except for some small differences. Finally, the throttling stiffness of the three notches is investigated, with that of divergent U-shape groove falls between spheroid-shape groove and triangle-shape groove. Similar results are found for steady flow force. The results indicate that the groove shape has significant effects on the flow characteristics (flow area, discharge characteristic, jet flow angle, steady flow force and throttling stiffness) of spool valve. (C) 2014 Elsevier Ltd. All rights reserved.