Effect of Valve Core Speed on the Characteristics of Cavitation Flow during Fuel Pressure Relief

doi:10.3901/JME.2025.22.155

Abstract

Abstract: To obtain the influence of valve core speed on the cavitation and pressure characteristics during the pressure relief process of the high-pressure fuel, a visualization experiment was conducted to validate a three-dimensional numerical calculation model. Based on the validated model, numerical calculations were conducted to study the cavitation flow during the opening process of the solenoid valve at different valve core speeds. The results show that the cavitation in the throttling section and downstream is caused by flow separation and jet entrainment, respectively. Moreover, at the same valve lift, higher valve core speeds result in more vapor at the throttling section, and the influence of valve core speed decreases as the valve lift increases. When the valve lift is less than 0.08 mm, increasing valve core speed leads to a decrease in downstream vapor volume at the same valve lift. When the valve lift is greater than 0.08 mm, a gradually weakening periodic vortex cavitation appears above the stroke stop, and the higher the speed of the valve core, the stronger the vortex cavitation. Additionally, the pressure fluctuations at the throttling section and downstream both originate from changes in total vapor volume fraction. The pressure in the throttling section exhibits attenuated fluctuations when the valve lift is less than 0.04 mm, and both frequency components of the fluctuations increase linearly with the valve core speed. The downstream pressure fluctuations occur when the valve core stroke is less than 0.06 mm, and with increasing valve core speed, the pressure peak increases.

Key words: high-pressure fuel, solenoid valve, valve core speed, cavitation, pressure fluctuation

CLC Number:

TK421

LIANG Yuxiu, LI Yikai, LIU Hui. Effect of Valve Core Speed on the Characteristics of Cavitation Flow during Fuel Pressure Relief[J]. Journal of Mechanical Engineering, 2025, 61(22): 155-166.

References

[1] QIU T,DAI H F,LEI Y,et al. Dynamic flow behavior during fuel-offloaded process in control valve for unit pump fuel system[J]. Applied Thermal Engineering,2016,106:153-160.
[2] LIANG Y X,LIU F S,LI Y K,et al. Research on the dynamic cavitation flow characteristics in the control valve region during the opening process of the valve in an electronic unit pump[J]. IEEE Access,2020,8(99):128200-128212.
[3] ZHENG K X,HU H X,CHEN F G,et al. Failure analysis of the blackwater regulating valve in the coal chemical industry[J]. Engineering Failure Analysis,2021,125:1-15.
[4] SANTOS E G,SHI J,VENKATASUBRAMANIAN R,et al. Modelling and prediction of cavitation erosion in GDI injectors operated with E100 fuel[J]. Fuel,2021,289:119923.
[5] 刘城,闫清东,李娟,等.高功率密度液力变矩器空化特性研究[J].机械工程学报,2020,56(24):147-155.LIU Cheng,YAN Qingdong,LI Juan,et al. Investigation on the cavitation characteristics of high power-density torque converter[J]. Journal of Mechanical Engineering,2020,56(24):147-155.
[6] HE Z,TAO X,ZHONG W,et al. Experimental and numerical study of cavitation inception phenomenon in diesel injector nozzles[J]. International Communications in Heat and Mass Transfer,2015,65:117-124.
[7] 闵为,王东,郑直,等.低压下锥阀振荡空化的可视化试验研究[J].机械工程学报,2018,54(20):139-144.MIN Wei,WANG Dong,ZHENG Zhi,et al. Visualization experiment of vibration and cavitation in poppet valve under low pressure condition[J]. Journal of Mechanical Engineering,2018,54(20):139-144.
[8] 王沛.高压燃油系统压力波动与延迟特性研究[D].北京理工大学,2016.WANG Pei. Research on pressure fluctuation and delay characteristics for high pressure fuel supply system[D],Beijing Institute of Technology,2016.
[9] 魏云鹏,范立云,张瀚文,等.多次喷射下压力波动对喷嘴内流及近场喷雾影响试验研究[J].汽车工程,2023,45(5):836-844.WEI Yunpeng,FAN Liyun,ZHANG Hanwen,et al.Experimental research on influence of pressure fluctuation on nozzle flow and near field spray under multiple injections[J]. Automotive Engineering,2023,45(5):836-844.
[10] 孙申鑫,何志霞,冷先银,等.柴油机喷嘴内线空化对喷雾影响的试验[J].内燃机学报,2019,37(3):244-250.SUN Shenxin, HE Zhixia, LENG Xianyin, et al.Experiment on the influence of string cavitation on spray angle in diesel injector nozzles[J]. Transactions of CSICE,2019,37(3):244-250.
[11] 潘业俊,刘灿旭,刘红,等.船用低速柴油机喷嘴内流及初次破碎机理研究[J].内燃机学报,2022,40(5):412-419.PAN Yejun,LIU Canxu,LIU Hong,et al. Investigation on the in-nozzle flow and primary breakup of marine low-speed engines[J]. Transactions of CSICE,2022,40(5):412-419.
[12] HE Z X,CHEN Y,LENG X,et al. Experimental visualization and les investigations on cloud cavitation shedding in a rectangular nozzle orifice[J]. International Communications in Heat and Mass Transfer,2016,76:108-116.
[13] 何志霞,钟汶君,黄云龙,等.针阀运动对柴油机喷嘴瞬态流动特性的影响[J].内燃机学报,2012,30(4):336-342.HE Zhixia,ZHONG Wenjun,HUANG Yunlong,et al.Investigation of transient behavior of cavitation flow in injector nozzles affected by the needle movement[J].Transactions of CSICE,2012,30(4):336-342.
[14] HE Z X,ZHONG W,WANG Q,et al. An investigation of transient nature of the cavitating flow in injector nozzles[J]. Applied Thermal Engineering,2013,54(1):56-64.
[15] MA H Y,ZHANG T,AN Q S,et al. Visualization experiment and numerical analysis of cavitation flow characteristics in diesel fuel injector control valve with different structure design[J]. Journal of Thermal Science,2021,30(1):76-87.
[16] WANG C,HUANG B,WANG G,et al. Unsteady pressure fluctuation characteristics in the process of breakup and shedding of sheet/cloud cavitation[J]. International Journal of Heat and Mass Transfer,2017,114:769-785.
[17] ZHANG S, LI S. Cavity shedding dynamics in a flapper-nozzle pilot stage of an electro-hydraulic servo-valve:Experiments and numerical study[J]. Energy Conversion and Management,2015,100:370-379.
[18] SAHA B K,LI S J,LÜX B. Analysis of pressure characteristics under laminar and turbulent flow states inside the pilot stage of a deflection flapper servo-valve:Mathematical modeling with CFD study and experimental validation[J]. Chinese Journal of Aeronautics,2020,33(3):1107-1118.
[19] CHEN M,AUNG N Z,LI S J,et al. Effect of oil viscosity on self-excited noise production inside the pilot stage of a two-stage electrohydraulic servovalve[J]. Journal of Fluids Engineering-Transactions of the Asme,2019,141(1):1-15.
[20] WEN H,MA J L,JIANG G,et al. Effect of needle valve motion on cavitation and gas ingestion at end of injection[J]. Combustion Science and Technology,2020,(208):1-20.
[21] WANG C,MORO A,XUE F,et al. The influence of eccentric needle movement on internal flow and injection characteristics of a multi-hole diesel nozzle[J].International Journal of Heat and Mass Transfer,2018,117:818-834.
[22] ADAMS M.针阀运动对VCO喷嘴内部流动特性、喷油特性及喷雾特性的影响[D].镇江:江苏大学,2018.ADAMS M. Effect of internal needle dynamics on nozzle flow,injection and spray characteristics of a multi hole VCO nozzle[D]. Zhenjiang:Jiangsu University,2018.
[23] LUO T P, XIA J. Lattice boltzmann simulation of low-reynolds-number cavitating contracting-nozzle flow interacting with a moving valve[J]. AIP ADVANCES,2020,10(12):1-13.
[24] 代贺飞.电控单体泵燃油系统阀区域动态流动特性研究[D].北京:北京工业大学,2018.DAI Hefei. Investigation on dynamic flow characteristics in valve region for electronic control unit pump fuel system[D]. Beijing:Beijing University of Technology,2018.
[25] 吴姿宏,刘秀梅,李贝贝,等.基于图像灰度统计的调节阀空化分布特性研究[J].机械工程学报,2023,59(2):307-316.WU Zihong,LIU Xiumei,LI Beibei,et al. Research on cavitation distribution characteristics in regulate valve based on image gray statistics[J]. Journal of Mechanical Engineering,2023,59(2):307-316.
[26] SHIH T H,LIOU W W,SHABBIR A,et al. A new k-ε eddy viscosity model for high reynolds number turbulent flows[J]. Computers&Fluids,1995,24(3):227-238.