Study on Transient Fuel Hydrodynamic Force Characteristics of High-Speed Solenoid Valve for Common Rail Injector
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ght © 2020 KSAE/ 11719 pISSN 12299138/ eISSN 19763832
STUDY ON TRANSIENT FUEL HYDRODYNAMIC FORCE CHARACTERISTICS OF HIGH-SPEED SOLENOID VALVE FOR COMMON RAIL INJECTOR Jianhui Zhao1)*, Shunan Zhao1) and Leonid Grekhov2) College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China Power Engineering Department, Bauman Moscow State Technical University, Moscow 105005, Russian Federation 1)
2)
(Received 19 August 2019; Revised 4 December 2019; Accepted 2 January 2020) ABSTRACTThe working process of the high-speed solenoid valve (HSV) of high-pressure common rail (CR) injector has the characteristics of electro-magnetic-mechanical-hydrodynamic multi-physical field coupling. However, most of the research work in this field is carried out without considering hydrodynamic environment of the HSV. Furthermore, the dynamic response characteristics of the transient fuel hydrodynamic force (TFHF) of the HSV should not be neglected. In this study, a three-dimensional finite element method is used to simulate the TFHF between the injector electromagnet and the armature. The results show that cavitation phenomena appears on the lower surface of the armature during the HSV opening process. The faster the armature moves up, the greater the cavitation intensity. Damping holes on the armature can reduce the TFHF acting on the upper surface of the armature; however, the armature structure with straight grooves and damping holes reduces the TFHF more evidently during the HSV opening and the inhibition effect of this structure on cavitation is more evident. The TFHF on the armature decreases with an increase in the depth of the coil groove. However, the selection of the groove depth should be considered together with the optimization of the electromagnetic force characteristics of the HSV. KEY WORDS : transient fuel hydrodynamic force, cavitation phenomena, dynamic response characteristics, high-speed solenoid valve, common rail injector
NOMENCLATURE
1. INTRODUCTION
vap l VV t R nB RB pv p n HSV CR TFHF
High pressure common rail system is the core control system of modern diesel engine, which can achieve the best injection timing, injection law and cycle injection quantity in all working conditions of diesel engine, and it is the core of realizing efficient combustion and ultra-low emission of diesel engine (Dai et al., 2019; Wang et al., 2019; Lee et al., 2019; Cheng et al., 2019). The internal flow characteristics of CR injector directly determine the injection characteristics, and the flow in the injection hole is complex. Xue et al. (2017) studied the fuel flow in multiple nozzle holes of p-type injector, pointed out that the cavitation phenomenon, flow velocity and flow rate in each nozzle hole of the injector with asymmetric injection holes were obviously different, and the injection hole with large angle was more likely to produce cavitation. He et al. (2015) studied the critical cavitation number with a visualized nozzle, developed correlation of critical cavitation number with above
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