A Numerical Investigation of Nozzle Geometry and Injection Condition Effects on Diesel Fuel Injector Flow Physics

Weng, Ning; Reitz, Rolf D.; Diwakar, Ramachandra; Lippert, Andreas

doi:10.4271/2008-01-0936

Cited by 26 publications

(19 citation statements)

References 15 publications

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“…Contrasting these studies, several authors show that the flow inside the nozzle influences the nearnozzle region of the spray in terms of liquid-phase break-up, liquid length, and spray angle [9][10][11][12][13][14][15][16]. Many other studies also evidence the effects of nozzle flow characteristics over the macroscopic spray [3,4,6,11,[17][18][19][20]. This contrast, along with the remaining uncertainty on the effect of nozzle geometry on entrainment, combustion, and pollutant formation, leave room for fundamental questions on the subject.…”

Section: Introductionmentioning

confidence: 76%

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The effect of nozzle geometry over internal flow and spray formation for three different fuels

Payri

Viera

Gopalakrishnan

et al. 2016

Fuel

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h i g h l i g h t sTwo single hole nozzle (cylindrical and convergent) are used. A complete hydraulic characterization is done along with spray visualization. A fast pulsed light source is synchronized to a fast camera working at 160 kHz. The effect of nozzle geometry is analyzed for three different fuels. A large set of experimental data was obtained, which could be used for model validation. a b s t r a c tThe influence of internal nozzle flow characteristics over macroscopic spray development is studied experimentally for two different nozzle geometries and three fuels. The measurements include a complete hydraulic characterization consisting of instantaneous injection rate and spray momentum flux measurements, followed by a high-speed visualization of isothermal liquid spray in combination with cylindrical and conical nozzle configurations. Two of the fuels are pure components-n-heptane and ndodecane-while the third fuel consists of a three-component surrogate to better represent the physical and chemical properties of diesel fuel. The cylindrical nozzle with 8.6% larger diameter, in spite of higher mass flow rate and momentum flux, shows slower spray tip penetration when compared to the conical nozzle. The spreading angle is found to be inversely proportional to the spray tip penetration. The spreading angle is largely influenced by the nozzle geometry and the ambient density. Rail pressure was found to have weak influence on the near-field spreading angle and no influence on the standard deviation of the spreading angle. n-Heptane spray shows slowest penetration rates while n-dodecane and the surrogate fuel mixture show very similar spray behavior for variations in injection pressure and back pressure. However, the surrogate fuel mixture shows higher penetration than n-dodecane when using the conical nozzle and lower penetration than n-dodecane when using cylindrical nozzle.

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Section: Introductionmentioning

confidence: 76%

“…Majority of current spray models employ initial and boundary conditions at the nozzle exit as an indirect coupling to the flow inside the nozzle [3][4][5][6]. Such methods often dampen or lead to loss of smaller scale nozzle flow characteristics.…”

Section: Introductionmentioning

confidence: 99%

The effect of nozzle geometry over internal flow and spray formation for three different fuels

Payri

Viera

Gopalakrishnan

et al. 2016

Fuel

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“…These aspects have been extensively studied for regular diesel fuels due to their strong effect on air-fuel mixing efficiency and combustion development. In this sense, several authors have studied the influence of nozzle geometry and fuel properties on internal nozzle flow characteristics [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Consequences of using biodiesel on the injection and air–fuel mixing processes in diesel engines

Salvador

Ruíz

Salavert

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part D:

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A study of the injection process and spray behavior has been made for three different fuels. In particular, blends of rapeseed methyl ester (RME) with standard diesel fuel at 5% and 30% of biodiesel have been used for the current study, as well as pure RME.Hydraulic characterization of an 8-hole nozzle has been carried out using these three fuels, in order to explore and analyze the influence of fuel properties on mass flow rate and momentum flux at the nozzle exit. Additionally, spray visualization tests have been made in order to get information about spray cone angle, which allows the characterization of air-fuel mixing process. Finally, a theoretical derivation has been used to obtain further details of the microscopic characteristics of the spray and compare air-fuel mixing efficiency for the different biodiesel blends.

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“…Compared to cylindrical nozzles under the same injection conditions, converging nozzles tend to reduce cavitation and thus have larger nozzle discharge coefficients, while diverging nozzles increase cavitation and have smaller nozzle discharge coefficients. It is also cavitation and has larger discharge coefficients compared to sharp inlet nozzles under the same injection conditions [11]. Michele Battistoniet al in his research work compared two different fuels a standard diesel fuel and pure bio-diesel, the methyl ester of soybean oil have been compared with regard to injection pressure.…”

Section: In -Cylinder Spraymentioning

confidence: 99%

A Review on Diesel Injectors Modeling, Spray and Cavitation

Veeranjaneyulu¹,

Tjprc²

2018

IJMPERD

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A Numerical Investigation of Nozzle Geometry and Injection Condition Effects on Diesel Fuel Injector Flow Physics

Cited by 26 publications

References 15 publications

The effect of nozzle geometry over internal flow and spray formation for three different fuels

The effect of nozzle geometry over internal flow and spray formation for three different fuels

Consequences of using biodiesel on the injection and air–fuel mixing processes in diesel engines

A Review on Diesel Injectors Modeling, Spray and Cavitation

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