Influence of physical fuel properties on the injection rate in a Diesel injector

Dernotte, Jérémie; Hespel, Camille; Foucher, Fabrice; Houille, Sébastien; Mounaïm‐Rousselle, Christine

doi:10.1016/j.fuel.2011.11.073

Cited by 87 publications

(31 citation statements)

References 15 publications

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“…Reduction of the discharge coefficient with increasing kinematic viscosity has also been observed in other studies for various nozzle geometries and fuels. [37][38][39] We consider now the absolute energy supplied to the fuel jet. Figure 5 shows as solid lines the total supplied energy to the liquid jet and demonstrates that it is a linear function of injection pressure.…”

Section: A Internal Developmentmentioning

confidence: 99%

How do liquid fuel physical properties affect liquid jet development in atomisers?

Charalampous

Hardalupas

2016

Physics of Fluids

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The influence of liquid fuel properties on atomisation remains an open question. The droplet sizes in sprays from atomisers operated with different fuels may be modified despite the small changes of the liquid properties. This paper examines experimentally the development of a liquid jet injected from a plain orifice in order to evaluate changes in its behaviour due to modifications of the liquid properties, which may influence the final atomisation characteristics. Two aviation kerosenes with similar, but not identical physical properties are considered, namely standard JP8 kerosene as the reference fuel and bio-derived Hydro-processed Renewable Jet (HRJ) fuel as an alternative biofuel. The corresponding density, dynamic viscosity, kinematic viscosity and surface tension change by about +5%, -5%, -10% and +5% respectively, which are typical for ‘drop-in’ fuel substitution. Three aspects of the liquid jet behaviour are experimentally considered. The pressure losses of the liquid jet through the nozzle are examined in terms of the discharge coefficient for different flowrates. The morphology of the liquid jet is visualised using high magnification Laser Induced Fluorescence (LIF) imaging. Finally, the temporal development of the liquid jet interfacial velocity as a function of distance from the nozzle exit is measured from time-dependent motion analysis of dual-frame LIF imaging measurements of the jet. The results show that for the small changes in the physical properties between the considered liquid fuels, the direct substitution of fuel did not result in a drastic change of the external morphology of the fuel jets. However, the small changes in the physical properties modify the interfacial velocities of the liquid and consequently the internal jet velocity profile. These changes can modify the interaction of the liquid jet with the surroundings, including air flows in coaxial or cross flow atomisation, and influence the atomisation characteristics during changes of liquid fuels

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Section: A Internal Developmentmentioning

confidence: 99%

How do liquid fuel physical properties affect liquid jet development in atomisers?

Charalampous

Hardalupas

2016

Physics of Fluids

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“…This is relatively minimal when the inner diameter of fuel pipe is 1.8mm. The variations in the injection pressure characteristics due to the differences in the fuel pressure [14], are the main cause of this effect, as clearly evident in Figure 2. Figure 8 gives the variations of the total cycle fuel injection quantity of the injector with the change in injection pump speed of different fuel pipes.…”

Section: Variation Of the Cycle Fuel Injection Quantitiesmentioning

confidence: 95%

A Study on the Influence of Fuel Pipe on Fuel Injection Characteristics of Each Nozzle Hole in Diesel Injector

Luo

Wang

Xue

et al. 2016

MATEC Web of Conferences

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Abstract. The inner diameter of high pressure fuel pipe has a significant effect on the fuel injection process and the performance of a diesel engine. The spray impact force of each nozzle hole of a conventional injection system of pump-line-nozzle for diesel engine (based on the spray momentum flux) and the injection pressure (on a fuel injection pump test rig) were measured. With varying fuel injection quantities and pump speed, the effects of the inner diameter of the high pressure fuel pipe on fuel injection process and the fuel injection characteristics of each nozzle hole were analyzed. It was noted from experimental results that the fuel injection pressure changes with variations in the inner diameter of the high pressure fuel pipe and also the injection duration gradually increases with increase in the inner diameter. .At low injection pump speed, even with the same geometric fuel deliver rate, the injection duration also increases gradually. Due to throttling effect and reduction in injection pressure, the fuel injection quantities of the injection nozzle were relatively minimal when the inner diameters of the high pressure fuel pipe were respectively small and large. The optimum injection pipe inner diameter for the right quantity for fuel injection falls between the two cases (between small and large). In addition, the injection rate of each nozzle hole increases with the decrease in angle between the needle axis and each of the nozzle hole axis. The fuel injection quantity of each nozzle hole increases while their relative difference decreases with increasing pump speed.

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“…In order to ensure effective combustion and lower emission for diesel engines, a study on optimization of the combustion spray process based on injection rates and spray characteristics is crucial [1,2]. In fact, spray development and fuel air interactions are all directly affected by injection rates, which further influences the combustion process [3].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of injection rate of each nozzle hole of multi-hole diesel injector

Deng

Cui

et al. 2016

Applied Thermal Engineering

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Influence of physical fuel properties on the injection rate in a Diesel injector

Cited by 87 publications

References 15 publications

How do liquid fuel physical properties affect liquid jet development in atomisers?

How do liquid fuel physical properties affect liquid jet development in atomisers?

A Study on the Influence of Fuel Pipe on Fuel Injection Characteristics of Each Nozzle Hole in Diesel Injector

Numerical simulation of injection rate of each nozzle hole of multi-hole diesel injector

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