Numerical investigation on effects of nozzle’s geometric parameters on the flow and the cavitation characteristics within injector’s nozzle for a high-pressure common-rail DI diesel engine

Sun, Zuo-Yu; Li, Guo-Xiu; Chen, Chuan; Yu, Yusong; Gao, Guo-Xi

doi:10.1016/j.enconman.2014.10.047

Cited by 106 publications

(44 citation statements)

References 26 publications

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“…Therefore, a diesel engine that is equipped with a highpressure common rail system has the potential to achieve the optimized design goals of high-efficiency combustion and ultralow emission [1][2][3][4][5]. The common rail injector is one of the high-pressure common rail system's critical components, with a direct influence on the cycle fuel injection quantity fluctuation, gas-liquid two-phase flow characteristics of highpressure fuel in the nozzle, fuel atomization characteristics in the cylinder, and air-fuel mixture quality [6][7][8][9]. The common rail injector is a complex, nonlinear, and multidimensional system that couples electromagnetic, mechanical, and hydraulic phenomena.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Electromagnetic Models of High-Speed Solenoid Valve for Common Rail Injector

Zhao

Fan

Liu

et al. 2017

Mathematical Problems in Engineering

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A novel formula easily applied with high precision is proposed in this paper to fit the -curve of soft magnetic materials, and it is validated by comparison with predicted and experimental results. It can accurately describe the nonlinear magnetization process and magnetic saturation characteristics of soft magnetic materials. Based on the electromagnetic transient coupling principle, an electromagnetic mathematical model of a high-speed solenoid valve (HSV) is developed in Fortran language that takes the saturation phenomena of the electromagnetic force into consideration. The accuracy of the model is validated by the comparison of the simulated and experimental static electromagnetic forces. Through experiment, it is concluded that the increase of the drive current is conducive to improving the electromagnetic energy conversion efficiency of the HSV at a low drive current, but it has little effect at a high drive current. Through simulation, it is discovered that the electromagnetic energy conversion characteristics of the HSV are affected by the drive current and the total reluctance, consisting of the gap reluctance and the reluctance of the iron core and armature soft magnetic materials. These two influence factors, within the scope of the different drive currents, have different contribution rates to the electromagnetic energy conversion efficiency.

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Section: Introductionmentioning

confidence: 99%

Investigation on Electromagnetic Models of High-Speed Solenoid Valve for Common Rail Injector

Zhao

Fan

Liu

et al. 2017

Mathematical Problems in Engineering

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“…The variation of hole passage diameter is complex for these nozzles. All nozzles show an initially diverging passage diameter which supports cavitation [32,44,45]. This is followed by a later section which is converging and this is greatest for the Ày hole of the 0°and 10°nozzles.…”

Section: Nozzle Characterisationmentioning

confidence: 94%

“…Factors which could influence spray dominance are hole geometry [23,24], injector needle movement [25], needle eccentricity [26], and cavitation [22,27]. Cavitation either in the nozzle sac (string cavitation), or on entry to nozzle hole (geometric induced cavitation) could be expected to alter mass discharge and its distribution across the nozzle exit thus altering spray characteristics [22,24,[28][29][30][31][32]. Knowledge of the vapour distribution across the nozzle exit could yield detail on the type of cavitation present.…”

Section: Introductionmentioning

confidence: 98%

Spray flow structure from twin-hole diesel injector nozzles

Nguyen

Duke

Kastengren

et al. 2017

Experimental Thermal and Fluid Science

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a b s t r a c tTwo techniques were used to study non-evaporating diesel sprays from common rail injectors which were equipped with twin-hole and single-hole nozzles for comparison. To characterise the sprays, high speed optical imaging and X-ray radiography were used. The former was performed at the Laboratory for Turbulence Research in Aerospace and Combustion (LTRAC) at Monash University, while the latter was performed at the 7-BM beamline of the Advanced Photon Source (APS) at Argonne National Laboratory. The optical imaging made use of high temporal, high spatial resolution spray recordings on a digital camera from which peripheral parameters in the initial injection phase were investigated based on edge detection. The X-ray radiography was used to explore quantitative mass distributions, which were measured on a point-wise basis at roughly similar sampling rate. Three twin-hole nozzles of different subtended angles and a single-hole nozzle were investigated at injection pressure of 1000 bar in environments of 20 bar back pressure. Evidence of strong cavitation was found for all nozzles examined with their C D ranging from 0.62 to 0.69. Penetration of the twin-hole nozzles was found to lag the single-hole nozzle, before the sprays merged. Switching in hole dominance was observed from one twin-hole nozzle, and this was accompanied by greater instability in mass flow during the transient opening phase of the injectors.

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“…Therefore, suitable fuel injectors are needed to provide sufficient control on the spray process and to meet the basic requirements for the atomisation and mixing process. High pressure injectors are one of the most commonly used injectors in commercial applications today [12]. They are designed to improve the atomisation process and to increase the turbulence levels within the combustion chamber for better mixing between the air and fuel.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of diesel spray using the Eulerian multiphase approach

Vujanović

Petranović

Edelbauer

et al. 2015

Energy Conversion and Management

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a b s t r a c tThis research investigates high pressure diesel fuel injection into the combustion chamber by performing computational simulations using the Euler-Eulerian multiphase approach. Six diesel-like conditions were simulated for which the liquid fuel jet was injected into a pressurised inert environment (100% N 2 ) through a 205 lm nozzle hole. The analysis was focused on the liquid jet and vapour penetration, describing spatial and temporal spray evolution. For this purpose, an Eulerian multiphase model was implemented, variations of the sub-model coefficients were performed, and their impact on the spray formation was investigated. The final set of sub-model coefficients was applied to all operating points. Several simulations of high pressure diesel injections (50, 80, and 120 MPa) combined with different chamber pressures (5.4 and 7.2 MPa) were carried out and results were compared to the experimental data. The predicted results share a similar spray cloud shape for all conditions with the different vapour and liquid penetration length. The liquid penetration is shortened with the increase in chamber pressure, whilst the vapour penetration is more pronounced by elevating the injection pressure. Finally, the results showed good agreement when compared to the measured data, and yielded the correct trends for both the liquid and vapour penetrations under different operating conditions.

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Numerical investigation on effects of nozzle’s geometric parameters on the flow and the cavitation characteristics within injector’s nozzle for a high-pressure common-rail DI diesel engine

Cited by 106 publications

References 26 publications

Investigation on Electromagnetic Models of High-Speed Solenoid Valve for Common Rail Injector

Investigation on Electromagnetic Models of High-Speed Solenoid Valve for Common Rail Injector

Spray flow structure from twin-hole diesel injector nozzles

Numerical modelling of diesel spray using the Eulerian multiphase approach

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