The Investigation of Geometric Parameters on the Injection Characteristic of the High Pressure Common-Rail Injector

Li, Guo-Xiu; Xu, Chun Long; Xi, Xing; Wu, Xiao; Sun, Shu Ping

doi:10.1115/1.4041134

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…However, when a large clearance leakage occurs, in order to increase the injection quantity by 13%240%, the fuel leakage increases threefold. Wang et al 10 pointed out that the leakage at the needle valve and the control piston coupling greatly affected the injection characteristics of the common rail injector, and the transient leakage characteristics of the fuel under high pressure should be considered during the construction of the numerical model. Catania and Ferrari 11 found that the higher rail pressure would lead to a decrease in the overall volumetric efficiency of the fuel pump without changing the rotational speed, which is related to the increase of fuel leakage rate and the fuel expansion in the clearance volume.…”

Section: Introductionmentioning

confidence: 99%

Research on the influential factors related to the fuel leakage rate in the plunger-sleeve clearance of high pressure common rail system

Lu,

Zhao,

Grekhov

2023

International Journal of Engine Research

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In this study, a numerical model of the fuel leakage rate in the plunger-sleeve clearance of high-pressure common rail system was established based on graph theory. The transient clearance changes caused by the elastic deformation and the physical properties of the fuel along the flow direction within the plunger-sleeve were considered. This model realized the fluid–structure–thermal transient coupling during the leakage, and the accuracy was verified by comparing the calculated fuel leakage rate with the experimental data. Based on the main structural parameters of the plunger-sleeve, a three-level five-factor experimental calculation matrix was proposed using the D-optimal design method. The fuel leakage rates of all groups in the calculation matrix were obtained based on the fuel leakage rate numerical model, and the significant influencing parameters of the fuel leakage rate were determined using analysis of variance (ANOVA). The results indicate that the plunger diameter, sleeve external diameter, plunger-sleeve initial clearance and sealing length are significant parameters that affect the fuel leakage rate. In case of interaction between parameters, the interaction between the plunger diameter and sleeve external diameter, plunger diameter and plunger-sleeve initial clearance, and plunger diameter and plunger-sleeve sealing length contributed to a significant change in the fuel leakage rate. The influencing behavior of significant single parameters and significant interactions between parameters on the fuel leakage rate were revealed. The research outcomes can provide theoretical support for the optimization of the design of plunger-sleeve.

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Section: Introductionmentioning

confidence: 99%

Research on the influential factors related to the fuel leakage rate in the plunger-sleeve clearance of high pressure common rail system

Lu,

Zhao,

Grekhov

2023

International Journal of Engine Research

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“…As the “brain” and “heart” of a high‐speed and high‐power diesel engine, the high‐pressure common rail injection system enables a precise adjustment of the fuel injection to increase the output power of a diesel engine, improve fuel economy, and reduce the emission of nitrogen oxides and particulate matter significantly 2–4 . As the core component of a high‐pressure common rail injection system, a fuel injector represents the highest technology level and development difficulty for the common rail system, and it exerts an important impact on the power performance, fuel economy, and emission control of diesel engines 5,6 . The strong flow recirculation and local depression inside a fuel injector provide favorable conditions for the occurrence of cavitation 7 .…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4] As the core component of a high-pressure common rail injection system, a fuel injector represents the highest technology level and development difficulty for the common rail system, and it exerts an important impact on the power performance, fuel economy, and emission control of diesel engines. 5,6 The strong flow recirculation and local depression inside a fuel injector provide favorable conditions for the occurrence of cavitation. 7 Cavitation, which exerts a facilitating effect on the atomization of the fuel, mainly occurs inside injector nozzles and control valves.…”

Section: Introductionmentioning

confidence: 99%

Study of the influence laws of the flow and cavitation characteristics in an injector control valve

Ren

Tie-xiong

et al. 2022

Energy Science & Engineering

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Fuel cavitation can cause damage to the structure of an injector control valve, which can further affect the service life of the injector. Therefore, it is of great importance to carry out research on the mechanism of cavitation in injector control valves. In this study, the dynamic evolution of the cavitation and fuel flow characteristics during the opening of a ball valve in a high‐pressure common rail injector control valve were studied. First, a transient CFD simulation of the cavitation during the opening of the control valve was performed using dynamic mesh technology to analyze the evolution and formation mechanism of the cavitation. The cavitation was influenced by the fuel flow velocity, which was affected by the sealing cone angle and the ball valve movement. Additionally, the fuel reflux could effectively inhibit the development of cavitation. By comparing with the pressure, velocity, and mass flow rate of the fuel under conditions without cavitation, it was found that the cavitation had a remarkable effect on reducing the hydraulic shock to the ball valve and sealing cone as well as stabilizing the fluctuation of the fuel velocity in the control chamber. In addition, the cavitation noticeably decreased the fuel mass flow rate (by up to 32% at 0.015 ms) and increased the average pressure in the chamber (by up to 29.1% at 0.01 ms), ultimately leading to a slower response of the control valve. The analysis of different inlet pressures of the control valve indicated that the increase in the inlet pressure caused the cavitation to extend upward along the sealing cone, and that the cavitation ring area and the cavitation strength increased.

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“…As the core component of the high-pressure common rail system, the injector has the highest precision, the most constituent parts, the worst working environment, and is prone to wear and tear. It represents the highest technical content and development difficulty of the high-pressure common rail system, and its performance directly affects the performance of the entire diesel engine [11].…”

Section: Introductionmentioning

confidence: 99%

Research on the Effect of the Outlet Throttle Diameter Deviation on the Pressure Relief Rate of the Injector Control Valve

Ren

Tie-xiong

et al. 2022

Energies

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Common rail injector response characteristics depend on the control chamber pressure change rate, the outlet throttle diameter by manufacturing errors, or wear-induced deviations that affect the rate of pressure change in the control chamber, so the accuracy of the outlet throttle diameter directly affects the control valve response consistency. This paper presents a computational fluid dynamics (CFD) simulation of the effect of the deviation of the outlet throttle diameter on the average mass flow rate of the outlet throttle during the opening of the spherical valve in order to reduce this difference and ensure uniform injection characteristics. The results illustrate that with the increase in outlet throttle diameter deviation, the volume of gas phase in the control valve increases and the rate of pressure reduction in the control chamber accelerates, and the sensitivity coefficient of the average mass flow rate of the outlet throttle to the outlet throttle diameter deviation remains unchanged at 24.77. Cavitation occurs in the area of the outlet throttle when the spherical valve lift is 0.045 mm. The increase in rail pressure not only leads to an increase in the low-pressure area on the inner wall of the outlet throttle, an increase in the volume share of the gas phase, and an increase in the hydraulic impact on the sealing wall but also makes the average mass flow rate of the outlet throttle and the rate of change of the control chamber pressure during the opening of the spherical valve more sensitive to the deviation of the outlet throttle diameter.

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The Investigation of Geometric Parameters on the Injection Characteristic of the High Pressure Common-Rail Injector

Cited by 5 publications

References 1 publication

Research on the influential factors related to the fuel leakage rate in the plunger-sleeve clearance of high pressure common rail system

Research on the influential factors related to the fuel leakage rate in the plunger-sleeve clearance of high pressure common rail system

Study of the influence laws of the flow and cavitation characteristics in an injector control valve

Research on the Effect of the Outlet Throttle Diameter Deviation on the Pressure Relief Rate of the Injector Control Valve

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