Characterization of the pressure losses in a common rail diesel injector

López, J. Javier; Salvador, Francisco; Garza, Oscar A. de la; Arrégle, Jean

doi:10.1177/0954407012447020

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…At the same time, the flow area between nozzle volume and needle chamber increases with the rising of the needle lift, which improves the fuel injection rate. 36 As a result, the fuel pressure in the system changes sharply and the stability of the system is destroyed. It could be seen from Figure 12(e) that the eigenvalues distribute in both of the positive and negative half plane of the real axis, namely, the system is in unstable state again.…”

Section: Distribution Of Eigenvalue For the State Matrixmentioning

confidence: 99%

Investigation on the fuel injection stability of high pressure common rail system for diesel engines

Bai

Lan

Fan

et al. 2019

International Journal of Engine Research

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High pressure common rail system is the state-of-the art technology for modern diesel engines to achieve energy conservation and emission reduction. The economy and emission performance of the diesel engines are influenced by the fuel injection stability of the high pressure common rail system. In this work, a high pressure common rail injector numerical model based on bond graph theory has been proposed. The comparisons between experimental results and numerical simulations show that the numerical model could reasonably predict the injection characteristics of the system. In order to reveal the essential rules and inherent characteristics of the fuel injection stability for high pressure common rail system, the rank variations of the state matrix at different injection pulse widths during fuel injection are obtained by means of a linear analysis. In addition, the distributions of eigenvalues for the state matrix in complex plane are investigated using Lyapunov method. The results show that the rank is influenced mainly by the movements of control valve and needle. Furthermore, the variation rule of the rank is independent of the injection pulse width before the needle is opened. The needle channel orifice of the injector plays a dominant role in transformation of the system from strong damping oscillation to underdamping oscillation. The opening and closing of control valve have significant effect on the stability of the system because its movement breaks the stability, and the movement of needle has remarkable effect on the oscillating characteristics of the system. High pressure common rail system is a complicated time-variant system with unstable pressure relief and strong oscillation injection.

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Section: Distribution Of Eigenvalue For the State Matrixmentioning

confidence: 99%

Investigation on the fuel injection stability of high pressure common rail system for diesel engines

Bai

Lan

Fan

et al. 2019

International Journal of Engine Research

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“…An efficient combustion process in engines such as direct injection (DI) Diesel engines and gasoline direct injection (GDI) engines, clearly depends on the characteristics of the own injection process and, in consequence, the later air-fuel mixing process. 1 However, although in the last decade the experimental facilities 2,3 and procedures 4,5 have experimented a great quality increase and better performance, the development of the simulation methods (zero-dimensional, [6][7][8] one dimensional, 9,10 and/or tri-dimensional methods [11][12][13] ) have become these tools in the most important tool for a better understanding of such complex process.…”

Section: Introductionmentioning

confidence: 99%

Impact of alternative and fossil diesel fuels on internal flow of injection nozzle

Martos

Soriano

Mata

et al. 2021

International Journal of Engine Research

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This work presents a computational study about the effect of different fossil fuels (Diesel and GTL) and renewable (Farnesane and Biodiesel) on the characteristics of the nozzle fuel internal flow (speed flow, cavitation, mass flow rate and discharge coefficient). This investigation was focused on the pass of fuel from the volume around the tip of the injector needle to the nozzle holes. Several engine-operating conditions, characteristic of urban driving conditions, were tested. These conditions, characterized by their injection pressure and injection timing as well as the experimental rates of fuel injected, were simulated with all mentioned fuels. Solenoid operated seven holes injector, 0.15 mm orifice diameter was used. Results show the effect of fuel origin on the internal flow along the nozzle orifice of the injector. Among the results obtained are the following: at medium load the effect of the needle lift on the cavitation generation is more significant than the fluid circulation velocity and fuel origin impacts as follows: Biodiesel > GTL > Farnesane > Diesel; while, at medium or high engine speed, an increase of engine load causes a decrease of cavitation generation and fuel origin impacts as follows: Diesel >> Farnesane > GTL > Biodiesel.

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“…Changing the dimensions and condition of the spray hole surface significantly affects the flow properties of injector nozzles, and this, in turn, determines the size and form of fuel jets dosed to individual cylinders of a diesel engine and the quality of fuel atomization. Many investigations have shown that the nozzle hole geometry and its internal flow characteristics play an essential role in the spray formation [2,12,16,17] and combustion process [7,8,14,18].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Design and Technology of Injector Nozzles in Terms of Minimizing Energy Losses on Friction in Compression Ignition Engines

Monieta¹,

Kasyk²

2021

Applied Sciences

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The operation of injection apparatus in self-ignition engines results from the design, manufacturing technology and wear and tear during operation. The technical state of the injector apparatus significantly affects the engine performance, fuel consumption, toxicity and smoke opacity of outlet gases. The most unreliable element of the injection apparatus is the injector nozzle, the quality of which depends on the quality of construction and production, operating conditions and the of the fuels used, etc. One of the design parameters of the injector nozzles, determining the technical state is the geometry of the nozzle holes. An attempt was made to optimize the selection of the dimensions and surface condition of the spray holes to significantly affect the flow properties of the injector nozzles and, consequently, to decide on the size and form of fuel dosed streams to individual cylinders of a self-ignition engine and the quality of fuel atomization. In work, a simulation model was developed, and the pressure losses and the mass fluid of the injected fuel were minimized for selected significant geometric features, taking into account the influence of operating conditions. With the use of Mathematica software, simulation optimization methods and methods based on evolutionary algorithms were elaborated.

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Characterization of the pressure losses in a common rail diesel injector

Cited by 10 publications

References 23 publications

Investigation on the fuel injection stability of high pressure common rail system for diesel engines

Investigation on the fuel injection stability of high pressure common rail system for diesel engines

Impact of alternative and fossil diesel fuels on internal flow of injection nozzle

Optimization of Design and Technology of Injector Nozzles in Terms of Minimizing Energy Losses on Friction in Compression Ignition Engines

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