Spray Atomization Models in Engine Applications, from Correlations to Direct Numerical Simulations

Santos, Fabien Dos; Moyne, Luis Le

doi:10.2516/ogst/2011116

Cited by 35 publications

(9 citation statements)

References 50 publications

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“…This shall be associated with increased density of the air inside the chamber, which increases along with pressure and temperature with piston movement. As shown previously by other researchers, gas density is one of the crucial parameters in terms of spray development for cylindrical nozzles (Hiroyasu and Arai 1990;Siebers 1999;Dos Santos and Le Moyne 2011;Ghurri et al 2012) as well as for hollow-cone injectors (Dong et al 2013). Moreover, as shown in Fig.…”

Section: Resultssupporting

confidence: 56%

n-Hexane injection into high-temperature and high-pressure environments

Kapusta

Pielecha

Wisłocki

et al. 2019

J Vis

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In this study, the process of n-hexane spray formation was investigated under a wide range of environmental conditions. The main aim of this research was to determine whether the global and visual properties of n-hexane spray change when the back pressure exceeds the critical pressure of the injected liquid. For this purpose, the liquid length and the boundary profile between the spray and surrounding air obtained by high-speed imaging of the Mie scattering signal were used. A major advantage of this work is that besides measuring global spray parameters, it provides quantitative analysis of the visual properties of the spray images; thus, the image analysis is not limited to qualitative visual impression. The results obtained in this study showed no step change in liquid length in terms of exceeding the critical parameters. Although qualitatively the boundary between the injected liquid and the surrounding gas seemed to become smoother in high-pressure and high-temperature conditions, the qualitative analysis did not support this observation.

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Section: Resultssupporting

confidence: 56%

n-Hexane injection into high-temperature and high-pressure environments

Kapusta

Pielecha

Wisłocki

et al. 2019

J Vis

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“…The experimental results of the whole penetration also showed a similar trend with the empirical equation values suggested by Hiroyasu and Arai. Equation (1), given by Naber and Siebers [27], concerns the non-dimensional penetration versus non-dimensional time:…”

Section: Spray Tip Penetrationmentioning

confidence: 99%

An Experimental Study on the Macroscopic Spray Characteristics of Biodiesel and Diesel in a Constant Volume Chamber

et al. 2015

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Abstract:The objective of this study was to investigate the macroscopic spray characteristics of different 0%-100% blends of biodiesel derived from drainage oil and diesel (BD0, BD20, BD50, BD80, BD100), such as spray tip penetration, average tip velocity at penetration, spray angle, average spray angle, spray evolution process, spray area and spray volume under different injection pressures (60, 70, 80, 90, 100 MPa) and ambient pressures (0.1, 0.3, 0.5, 0.7, 0.9 MPa) using a common rail system equipped with a constant volume chamber. The characteristic data was extracted from spray images grabbed by a high speed visualization system. The results showed that the ambient pressure and injection pressure had significant effects on the spray characteristics. As the ambient pressure increased, the spray angle increased, while the spray tip penetration and the peak of average tip velocity decreased. As the injection pressure increased, the spray tip penetration, spray angle, spray area and spray volume increased. The increasing blend ratio of biodiesel brought about a shorter spray tip penetration and a smaller spray angle compared with those of diesel. This is due to the comparatively higher viscosity and surface tension of biodiesel, which enhanced the friction effect between fuel and the injector nozzle surface and inhibited the breakup of the liquid jet.

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“…where: a -jet radius at the nozzle outlet; ρ -fuel density; ρ ⋅ ⋅ = σ Similar definitions of d k are proposed by other researchers (Hiroyasu 1985;Lefebvre, McDonell 2017;Dos Santos, Moyn 2011).…”

Section: Promising Directions Of Optical Scanning Methods Applicationmentioning

confidence: 76%

Comparative Studies of the Biodiesel Fuel Jet Development Dynamics in Common Rail and Conventional Design Fuel Systems

Kulmanakov

Lebedevas

Kulmanakov³

et al. 2019

Transport

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The results of comparative diesel and biodiesel (Rapeseed oil Methyl Ester (RME) and Rapeseed Oil (RO)) fuel jet structure studies by optical scanning method are presented. There is an interrelation between the dynamics of fuel jet development by the Common Rail (CR) with single-phase injection and Conventional Design System (CDS) and the parameters of mixture formation, which are typical for transferring the operation of the Diesel Engine (DE) from mineral diesel to RME and RO. The structure of the Diesel Fuel (DF) jet is significantly more heterogeneous by the size and number of droplets in CDS in comparison with CR. From the moment of the injection the presence of zones less saturated with fuel contributes to a relatively short induction period – 5° ca. compared to 11…12° ca. in the CR system. Using RME in the CR system in comparison with DF, increases the heterogeneity of the fuel jet, thereby causing a shorter (by 1…2° ca.) induction period in the whole investigated range of injection pressures of 60…160 MPa. The injection of a non-heated RO is accompanied by the shape and structure fluctuations of the fuel jet. RO heating to 65 °C stabilizes the structure of the jet and increases the share of less saturated zones. Promising way of use for the optical scanning method in the mathematical modelling of the DE working process is proposed.

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Spray Atomization Models in Engine Applications, from Correlations to Direct Numerical Simulations

Cited by 35 publications

References 50 publications

n-Hexane injection into high-temperature and high-pressure environments

n-Hexane injection into high-temperature and high-pressure environments

An Experimental Study on the Macroscopic Spray Characteristics of Biodiesel and Diesel in a Constant Volume Chamber

Comparative Studies of the Biodiesel Fuel Jet Development Dynamics in Common Rail and Conventional Design Fuel Systems

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