Numerical Analysis of High-Pressure Fast-Response Common Rail Injector Dynamics

Bianchi, Gian Marco; Falfari, Stefania; Pelloni, P.; Kong, Song‐Charng; Reitz, Rolf D.

doi:10.4271/2002-01-0213

Cited by 30 publications

(12 citation statements)

References 25 publications

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“…Additionally, 1D hydraulic models were also established by Han et al [31] and Rahim et al [35]. The detailed modelling of fuel injectors was demonstrated by Bianchi et al [36], Payri et al [32,37] and Salvador et al [38].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of the dynamic response of an electronic fuel injector regarding fuel properties and operating conditions

Yang

Zhou

2018

Applied Thermal Engineering

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The sensitivity of fuel properties to the dynamic response (needle valve opening/closing delay and needle valve opening/closing time) of a electronic fuel injector was investigated. The fuel properties in different operating conditions were varied individually in bulk modulus, density and viscosity. Firstly, an electronic fuel injector model was built and validated by injection rate and injection mass at three different rail pressures and three different activation times. Secondly, a DOE (design of experiment) model was built and the Uniform Latin Hypercube (ULH) design method was applied to study the influences of the fuel properties on the injector dynamic response from a statistical point of view. The effects of the fuel properties were compared by using a SS-ANOVA (smoothing spline analysis of variance) method at both a low and a high rail pressure. The bulk modulus was found to play a dominant role in influencing the valve opening/closing delay at the low rail pressure. However, at the high rail pressure, the effects of the viscosity are prominent, while the effects of the bulk modulus and the density are negligible. Additionally, how these fuel properties affect the dynamic response were reported by RSM (Response Surface Method) function charts, and the details of the pressure differences and needle valve movements were also disclosed

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Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of the dynamic response of an electronic fuel injector regarding fuel properties and operating conditions

Yang

Zhou

2018

Applied Thermal Engineering

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“…However, the latter mostly included only mechanical and fluid dynamical parts [9][10][11][12][13]. Publications rarely contain the electromagnetic circuit of the solenoid, but the work of Bianchi et al stands out [14][15][16][17], as a complete, detailed and validated CR injector. If the solenoid model is neglected, usually an interpolation of force data acting on the anchor is used instead [18][19].…”

Section: Introductionmentioning

confidence: 99%

Detailed Model of a Common Rail Injector

Vass

Zöldy

2019

Acta Universitatis Sapientiae, Electrical and Mechanical Engineering

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This work is about the validation of a Common Rail (CR) injector model. The model describes injector internal behavior in a detailed way, validation is done using dosage measurements and needle lift traces. The model contains fluid dynamic, mechanic and electro-magnetic parts describing all important internal processes. To compare the modelling results against measurement data, three test cases were chosen on a medium duty test engine to represent a wide range of operation points. Dosage measurements were done by averaging the injected mass of 1500 injections, each measurement repeated three times. Needle displacement was measured using an injector equipped with a needle lift sensor in the same operating points. The results of the simulated injector and the measured values showed good conformity both in needle displacement and injected fuel mass, so the model can be a basis for further injector and combustion analyses.

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“…In addition, the hydraulic variations of the control chamber is associated with the movement of the needle, which directly influences the pressure of the sac volume. 26,27…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the hydraulic variations of the control chamber is associated with the movement of the needle, which directly influences the pressure of the sac volume. 26,27 Most of these studies use numerical methods to simulate the needle movement process. The effect of needle opening on spray and fuel atomization is also studied.…”

Section: Introductionmentioning

confidence: 99%

Deformation of nozzle, needle, and control plunger of solenoid fuel injector under high injection pressure

Sun

2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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Future diesel engines require the use of solenoid fuel injection system with the ultra-high pressure of more than 2000 bars. The nozzle, needle, and control plunger of the solenoid injector deform under high pressure. This deformation affects the movement characteristics of the needle, thereby influencing the precise control of fuel injection. A test rig is set up to investigate the structural deformation and influencing factors of the solenoid injector under high pressure. The structural deformation of nozzle, needle, and control plunger under different pressures can be obtained by measuring the displacement of the upper end of the control plunger in the axial direction. The experimental longitudinal deformation of nozzle, needle, and control plunger of the solenoid injector, which was selected for the study, reaches 0.109 mm under the pressure of 1600 bars. This value is close to 40% of the maximum needle lift, which is 0.3 mm. Thus, the deformation can no longer be ignored. In view of the solenoid injector deformation under high injection pressure, a three-dimensional calculation model is established. The calculated results are compared with the experimental data. The calculation total longitudinal deformation of nozzle, needle, control plunger, and contact surface reaches 0.238 mm under the pressure of 2500 bars. The structure deformation of solenoid injector with different materials or geometric parameters is calculated under the pressure of 100–2500 bars. The deformation with new materials is 0.198 mm and the deformation with new geometric parameters is 0.0333 mm under the pressure of 2500 bar. These calculations show that the use of shorter control plungers, shorter needles, and larger wall thickness nozzles can effectively reduce injector deformation under high pressure. The results of the study can provide guidance on injector design, which can work with high injection pressure and much accurate injection.

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Numerical Analysis of High-Pressure Fast-Response Common Rail Injector Dynamics

Cited by 30 publications

References 25 publications

Sensitivity analysis of the dynamic response of an electronic fuel injector regarding fuel properties and operating conditions

Sensitivity analysis of the dynamic response of an electronic fuel injector regarding fuel properties and operating conditions

Detailed Model of a Common Rail Injector

Deformation of nozzle, needle, and control plunger of solenoid fuel injector under high injection pressure

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