基于2D-PIV的调节阀三维流场特性研究

doi:10.12141/j.issn.1000-565X.230152

摘要/Abstract

摘要：

调节阀流道内流动状态直接影响其服役寿命和系统工作稳定性，为了探究调节阀内部三维流场的分布特性，通过二维粒子图像测速（2D-PIV）装置获取三维坐标系下不同切面的流场特征，利用插值计算其余节点的流场信息，实现调节阀流场的三维重构。实验结果表明：三维重构速度场与二维速度场整体呈一致趋势，油液在调节阀节流口处由于节流效应形成对冲射流，射流汇合后在阀芯头部下游形成高速的整体喷射；阀芯顶端区域由于两侧冲击射流的合并会产生一定的油液回流现象；整体流道速度随着拍摄平面外移均呈逐步下降的趋势，上游流道速度平稳下降到一定值后保持稳定，节流口附近速度呈先升高后下降的趋势且变化幅度较大，壁面阻力以及剪切力的存在使得近壁面速度保持平稳。下游区域速度呈同心圆分布，从湍流变为有序流动。仿真结果表明，三维重构流场与理论计算结果基本一致，最大重构误差为9.5%，出现在节流口处的高速流区域。实验重构结果与仿真重构结果具有高度相似性，流动平缓区域的重构精度较高。本研究可为优化调节阀结构和改善空蚀性能提供参考，也可为微小流道三维流场测量提供借鉴。

关键词: 流场可视化, 粒子图像测速, 调节阀, 速度场, 三维重构

Abstract:

The flow state in the flow channel of the control valve directly affects its service life and system stability. In order to explore the three-dimensional flow field information inside the control valve, a series of three-dimensional grid nodes were obtained by shooting different planes with a two-dimensional particle image velocimetry (2D-PIV) device, and the flow field information of unknown nodes was obtained by interpolation, so as to realize the three-dimensional reconstruction of the control valve flow field. The experimental results show that the overall trend of the three-dimensional reconstructed velocity field is consistent with that of the two-dimensional velocity field. The oil at the throttle port of the control valve forms a counter jet due to the throttling effect, and the jet converges to form a high-speed overall jet in the downstream of the valve core head. The combination of impinging jets on both sides in the top area of the valve core will produce a certain amount of oil backflow. The overall flow channel velocity decreases gradually with the moving out of the shooting plane. The velocity distribution of the upstream flow channel decreases steadily at first and then maintains a stable value. The velocity value near the throttle orifice increases first and then decreases, with a large variation. The wall resistance and shear force keep the near-wall velocity stable. The flow velocity in the downstream region is concentric and the flow field changes from turbulent flow to orderly flow. The simulation results show that the overall area of the three-dimensional reconstruction flow field is primarily consistent with the theoretical flow field. The maximum reconstruction error is 9.5%, occurring in the high-speed flow area of the throttle. The experimental reconstruction results is highly similar to the simulation reconstruction results and the reconstruction effect in the smooth flow area is better than that in the violent part. The research can provide a reference for the structural optimization design of the control valve and the improvement of cavitation performance, and is also provides an effective reference for the three-dimensional flow field measurement of the micro-channel.

Key words: flow visualization, particle image velocity, control valve, velocity field, 3D reconstruction

中图分类号:

TH137

刘秀梅, 吴速, 李贝贝, 等. 基于2D-PIV的调节阀三维流场特性研究[J]. 华南理工大学学报(自然科学版), 2023, 51(11): 110-118.

LIU Xiumei, WU Su, LI Beibei, et al.. Study on 3D Flow Field Characteristics of Control Valve Based on 2D-PIV[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(11): 110-118.

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名称	型号	性能参数
齿轮泵	CBN-F310	20 MPa额定压力
溢流阀	YF-L10H-4	16 MPa额定压力
流量计	YH-LWC10SLA	1.0%级/10 MPa
压力表	YB-150	0.4精度等级

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