Limit of Fuel Injection Rate in the Common Rail System under Ultra-High Pressures

Zhao, Jianhui; Grekhov, Leonid; Yue, Pengfei

doi:10.1007/s12239-020-0062-3

Cited by 26 publications

(10 citation statements)

References 22 publications

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“…Moreover, as a result of increasing losses and further heating of the fuel, the sound speed and the average fuel consumption speed begin to decrease (the right side of the graph in Figure 9). Thus, in order to increase the instant fuel consumption and reduce the duration of the injection, increasing the injection pressure more than 290 ... 310 MPa is irrational [13]. This does not apply to the conclusion about the possibility of further reducing the droplet diameter and improving other parameters of the fuel jet; additional research is required in this issue.…”

Section: Discussionmentioning

confidence: 99%

Operation-related features of diesel fuel injection systems at pressures up to 400 MPa

Zhao

Grekhov

Денисов

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The interest in the high pressure injection in diesel engines continues to grow. Optimal injection pressure is a function of the engine parameters and its application and is open to question. The study investigates the injection features of diesel fuel at pressures above 300-400 MPa. The injection pressure level, at which the fuel flow through the nozzle ceases to grow, was experimentally determined, and an improved simulation method for the heavy fuel injection modelling was proposed.

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Section: Discussionmentioning

confidence: 99%

Operation-related features of diesel fuel injection systems at pressures up to 400 MPa

Zhao

Grekhov

Денисов

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…10 Electromagnetic flowmeters are suitable for flows characterized by a pronounced frequency content, but the constraint on the required electrical conductivity of the measured fluid, which should be higher than 0.1 uS/cm, excludes the possibility of applying this category of flowmeters to diesel or gasoline engines, since both are characterized by a much lower conductivity than that of the aforementioned threshold. 11 The currently available Coriolis flowmeters can be applied for the measurement of a flowrate characterized by a pressure of up to around 400 bar, 12 although modern diesel injection systems can reach pressure levels of up to 3000 bar, 13 while the 500 bar level is the target for next-generation GDI systems. 14 However, the invasiveness of this family of devices may represent a limit to their application.…”

Section: Introductionmentioning

confidence: 99%

“…The currently available Coriolis flowmeters can be applied for the measurement of a flowrate characterized by a pressure of up to around 400 bar, 12 although modern diesel injection systems can reach pressure levels of up to 3000 bar, 13 while the 500 bar level is the target for next-generation GDI systems. 14 However, the invasiveness of this family of devices may represent a limit to their application.…”

Section: Introductionmentioning

confidence: 99%

Investigation of a GDI injector with an innovative flowmeter for high-pressure transient flows

Ferrari

Pizzo²,

Vento

2023

International Journal of Engine Research

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A new flowmeter for high pressure flows, characterized by intense dynamic events, is presented. The flowmeter algorithm is based on the measurement of two pressure signals along the investigated pipe, and the flowrate is obtained through an ordinary differential equation given by the combination of the continuity and the momentum partial differential equations. This flowmeter has been applied to a GDI injector to monitor the flowrate that enters the injector during an injection event. A 1D numerical model of the GDI injector has been set up and validated, and the numerical outcomes have been used to confirm the consistency of the experimental results obtained from the new flowmeter, for both single and pilot-main injections. The internal dynamics of the injector has also been investigated, using both the 1D numerical tool and the innovative flowmeter. A possible feedback-control strategy has been set up to compensate for any inaccuracy of the injected mass by applying the flowmeter to the hydraulic high-pressure circuit.

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“…In this connection, important tasks are ensuring injection pressure up to 2000 bar and higher as was investigated by Pflaum [1], Shatrov [2], Yu [3], Bosch company [4], as well as the injection rate front shape control and organization of fuel distribution in the combustion chamber which was studied by Shatrov [5], Kamaltdinov [6], Iakovenko [7], Wuethrich [8]. It was demonstrated by Wloka [9], Grekhov [10], Zhao [11], Vera-Tudela [12] that the desired fuel injection law at any operation mode of the engine is formed by variation of the control impulse duration and pressure in the common rail. It also depends on the wave phenomenon originating in the high-pressure line and having a considerable impact on the fuel injection process in the case of a multistage injection.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pressure Oscillations in Common Rail Injector on Fuel Injection Rate

et al. 2020

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Fuel injection causes considerable oscillations of fuel pressure at the injector inlet. One of the reasons is hydraulic impact when the needle valve closes. For multiple injections, the previous injections affect the following. As both the fuel pressure in rail pac and the injection rate grow, the oscillations increase. The pressure oscillation range at the common rail injector inlet at pac=1500 bar is up to 350 bar, and at the rail pressure pac=500 bar, the amplitude decreases to 80 bar. Physical properties of the fuel are also important. As the viscosity of the fuel increases, its hydraulic friction grows which results in a rapid damping of pressure oscillations. The data for an injector operating on sunflower oil is presented. As compared with diesel fuel, the oscillations range decreases from 400 to 250 bar at the same operating mode. The influence of the interval between the impulses of a double injection on the injection rate of the second fuel portion was investigated. Superposition of two waves during multiple injections may result in amplification and damping of the oscillations. Simulation was performed to estimate the influence of fuel type and time interval Δτ between control impulses of a double injection on the injection quantity of the second portion at pressures of 2000-3000 bar. When the rail pressure pac grows, the oscillations and their impact on the injection process increase. For diesel fuel at pressure of pac=2000 bar, the variation in injection rates of the second portion is 2.36-4.62 mg, and at pac=3000 bar – 1.58-6.63 mg.

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Limit of Fuel Injection Rate in the Common Rail System under Ultra-High Pressures

Cited by 26 publications

References 22 publications

Operation-related features of diesel fuel injection systems at pressures up to 400 MPa

Operation-related features of diesel fuel injection systems at pressures up to 400 MPa

Investigation of a GDI injector with an innovative flowmeter for high-pressure transient flows

Influence of Pressure Oscillations in Common Rail Injector on Fuel Injection Rate

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