A zero-dimensional model to simulate injection rate from first generation common rail diesel injectors under thermodynamic diagnosis

Soriano, José A.; Mata, Carmen; Avila, Cristian

doi:10.1016/j.energy.2018.06.054

Cited by 36 publications

(36 citation statements)

References 28 publications

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“…Experimental results could prove useful for validation and improvement of simple spray models, 24–26 as well as zero-dimensional models that calculate the ROI signals for numerous boundary conditions. 27–30 Furthermore, needle dynamics may differ in the momentum flux test rig because of the changes in the interface from fuel–fuel to fuel–gas. 31–33 Thus, it is essential to quantify the injected mass and its allocation in engine-like conditions, especially in highly transient pulses such as small pilot/post injections.…”

Section: Introductionmentioning

confidence: 99%

Measurements of the mass allocation for multiple injection strategies using the rate of injection and momentum flux signals

Payri

Gimeno

Martí-Aldaraví

et al. 2020

International Journal of Engine Research

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As legislations set very stringent environmental and fuel economy standards, researchers have pushed into a continuous development in all areas of the diesel engine. The recent evolution of the injection technologies has permitted to modify the fuel-delivery strategies. From what was a single pulse per injection event, modern systems allow to inject up to eight different times precisely per combustion cycle. In such sense, experimental results of the rate of injection and momentum flux could be useful for validation and improvement of computational models. Moreover, accurately quantifying the injected mass per pulse in a fuel–gas interface can provide data with more realistic engine-like conditions. To this end, this research presents measurements of the rate of injection and momentum flux for two simple multiple injection strategies: a pilot-main and a main-post. Boundary conditions included two rail and discharge pressures, two different pilot/post quantities and four dwell times. A new approach was employed to estimate the mass allocation with the momentum flux data, and results were compared to the rate of injection traces to verify the distribution calculated. On the results, signals for each pulse were successfully decoupled using its rising and falling edge. The shot-to-shot variability of the pilot/post injection was highly dependent on its transitory characteristics, and on the dwell time for post injections due to internal pressure waves. The injected mass per pulse was successfully measured as well in the momentum flux test rig, and the energizing time changed slightly to account for the different operation interfaces. Signals from both measurement campaigns showed a remarkable agreement when compared, ascertain the possibility of measuring the injected mass, and its allocation for multiple injection strategies, in the momentum flux test rig.

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Section: Introductionmentioning

confidence: 99%

Measurements of the mass allocation for multiple injection strategies using the rate of injection and momentum flux signals

Payri

Gimeno

Martí-Aldaraví

et al. 2020

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…With the objective of not confusing the reader when reading the code of letters assigned to the tested modes of operation that appear in the results and discussion section (modes A, C, E, G, I), it should be explained that the nine modes that appear in Table 3, and its nomenclature correspond to test plans with different objectives to those of this work. 27,28 In summary, the modes tested in this work are only those that appear in bold in Table 3, as well as with black dots in Figure 7.…”

Section: Methodsmentioning

confidence: 99%

Effect of the use of a thermoelectric generator on the pumping work of a diesel engine

Ezzitouni

Fernández-Yáñez

Rodríguez

et al. 2019

International Journal of Engine Research

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Approximately a third part of the energy intake of a light-duty diesel engine is wasted through the exhaust system. Rising awareness of environmental issues together with fuel economy has encouraged research upon energy recovery in internal combustion engines. This article focuses on the application of thermoelectric generators in light-duty diesel vehicles. Most studies available in the literature tend to focus on maximizing the recovered electrical power, not always considering the increase in engine pumping work or testing conditions similar to those of a vehicle. The goal of this article is to evaluate the consequences of the modification of the cross-sectional area in the exhaust pipe that adding a thermoelectric generator implies and to compare them with the electrical power produced by the thermoelectric generator. The effect on the indicated and pumping parameters of the engine under common urban driving conditions is presented. From the results, it can be drawn that within the limits of engine speed and torque tested, the modification of the cross-sectional area does not have a significant negative effect on the engine pumping efficiency. This means that there is potential for the employment of this technique in energy recovery from light-duty vehicles.

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“…However, in this study, only the main injection process has been considered. A detailed description of the experimental work and experimental set-up is presented in references [31,32].…”

Section: Experimental Set-upmentioning

confidence: 99%

Effect of the In-Cylinder Back Pressure on the Injection Process and Fuel Flow Characteristics in a Common-Rail Diesel Injector Using GTL Fuel

et al. 2021

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The presented paper aims to study the influence of mineral diesel fuel and synthetic Gas-To-Liquid fuel (GTL) on the injection process, fuel flow conditions, and cavitation formation in a modern common-rail injector. First, the influence on injection characteristics was studied experimentally using an injection system test bench, and numerically using the one-dimensional computational program. Afterward, the influence of fuel properties on internal fuel flow was studied numerically using a computational program. The flow inside the injector was considered as multiphase flow and was calculated through unsteady Computational Fluid Dynamics simulations using a Eulerian–Eulerian two-fluid approach. Finally, the influence of in-cylinder back pressure on the internal nozzle flow was studied at three distinctive back pressures. The obtained numerical results for injection characteristics show good agreement with the experimental ones. The results of 3D simulations indicate that differences in fuel properties influence internal fuel flow and cavitation inception. The location of cavitation formation is the same for both fuels. The cavitation formation is triggered regardless of fuel properties. The size of the cavitation area is influenced by fuel properties and also from in-cylinder back pressure. Higher values of back pressure induce smaller areas of cavitation and vice versa. Comparing the conditions at injection hole exit, diesel fuel proved slightly higher average mass flow rate and velocities, which can be attributed to differences in fluid densities and viscosities. Overall, the obtained results indicate that when considering the injection process and internal nozzle flow, GTL fuel can be used in common-rail injection systems with solenoid injectors.

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A zero-dimensional model to simulate injection rate from first generation common rail diesel injectors under thermodynamic diagnosis

Cited by 36 publications

References 28 publications

Measurements of the mass allocation for multiple injection strategies using the rate of injection and momentum flux signals

Measurements of the mass allocation for multiple injection strategies using the rate of injection and momentum flux signals

Effect of the use of a thermoelectric generator on the pumping work of a diesel engine

Effect of the In-Cylinder Back Pressure on the Injection Process and Fuel Flow Characteristics in a Common-Rail Diesel Injector Using GTL Fuel

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