Comparison of Diesel Spray Combustion in Different High-Temperature, High-Pressure Facilities

Pickett, Lyle M.; Genzale, Caroline L.; Bruneaux, Gilles; Malbec, Louis-Marie; Hermant, Laurent; Christiansen, Caspar Ask; Schramm, Jesper

doi:10.4271/2010-01-2106

Cited by 255 publications

(239 citation statements)

References 27 publications

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“…This code was developed by the Sandia National Laboratories group and can be found online [27]. The underlying algorithm tries to remove the schlieren effect of the hot ambient gases in order to more easily visualize the jet structure [29]. The code is based on the texture that a schlieren image I t has at any time instant.…”

Section: Spray Tip Penetration Measurementmentioning

confidence: 99%

An experimental analysis on the evolution of the transient tip penetration in reacting Diesel sprays

Desantes

Pastor

García-Oliver

et al. 2014

Combustion and Flame

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Schlieren imaging has helped deeply characterize the behavior of diesel spray when injected into an oxygen-free ambient. However, when considering the transient penetration of the reacting spray after autoignition, i.e. the Diesel flame, few studies have been found in literature. Differences among optical setups as well as among experimental conditions have not allowed clear conclusions to be drawn on this issue. Furthermore, soot radiation may have a strong effect on the image quality, which cannot be neglected.The present paper reports an investigation on the transient evolution of Diesel flame based upon schlieren imaging. Experimental conditions have spanned values of injection pressure, ambient temperature and density for typical Diesel engine conditions. An optimized optical setup has been used, which makes it possible to obtain results without soot interference. Based on observations for a long injection event (4 ms Energizing Time), the analysis has resorted to extensive comparison of inert and reacting sprays parameters, which have made it possible to define different phases after autoignition.Shortly after autoignition, axial and radial expansion of the spray have been observed in terms of axial penetration and radial cone angle. After that, during a stabilization phase, the reacting spray penetrates at a similar rate as the inert one. Later, the reacting spray undergoes an acceleration period, where it penetrates at a faster rate than the inert one. Finally, the flame enters a quasi-steady penetration phase, where the ratio of reacting and inert penetration stabilizes at a nearly constant value. The duration of the reacting spray penetration stages shows modifications when varying engine parameters such as air temperature, air density, injection pressure, and nozzle diameter. However, the proportionality between reacting and inert penetration has been observed to depend mainly on temperature, in agreement with observed reductions in entrainment when shifting from inert to reacting conditions.

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Section: Spray Tip Penetration Measurementmentioning

confidence: 99%

An experimental analysis on the evolution of the transient tip penetration in reacting Diesel sprays

Desantes

Pastor

García-Oliver

et al. 2014

Combustion and Flame

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“…Following the ECN philosophy, in order to enable the comparison with a CFD simulation, a single-component fuel has been employed (n-dodecane): in fact a wide amount of data about this fuel can be found in the literature [18].…”

Section: The Injection Systemmentioning

confidence: 99%

Experimental characterization of diesel ignition and lift-off length using a single-hole ECN injector

Benajes

Payri

Bardi

et al. 2013

Applied Thermal Engineering

141

125

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“…In order to promote international collaboration among experimental and computational researchers within the engine combustion field, the ECN (Engine Combustion Network facilities [8] [9] and to assess the techniques utilized [10][11] [12]. The majority of these works consisted on allocating one of the injectors to each test facility and assuming an identical behavior due to the manufacturer specification.…”

Section: Introductionmentioning

confidence: 99%

Engine combustion network: Influence of the gas properties on the spray penetration and spreading angle

Payri

Bardi

et al. 2014

Experimental Thermal and Fluid Science

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In this work, three Engine Combustion Network (ECN) single-hole nozzles with the same nominal characteristics have been tested under a wide range of conditions measuring spray penetration and spreading angle. n-dodecane has been injected in nonevaporative conditions at different injection pressures ranging from 50 to 150 MPa and several levels of ambient densities from 7.6 to 22.8 kg/m 3 . Nitrogen and Sulphur Hexafluoride (SF 6 ) atmospheres have been explored and,in the first case, a temperature sweep from 300 to 550 K at constant gas density has been executed. Mie scattering has been used as the optical technique by employing a fast camera, whereas image processing has been performed through a home-built Matlab code. Differences in spray penetration related to spray orifice diameter, spreading angle and start of injection transient have been found for the three injectors. Significant differenceshave been obtained when changing the ambient gas, whereas ambient temperature hardly affects the spray characteristics up to 400 K. However, a reduction in penetration has been observed beyond this point, mainly due to the sensitivity limitation of the technique as fuel evaporation becomes important. The different behavior observed when injecting in different gases could be explained due to the incomplete momentum transfer between spray droplets and entrained gas, together with the fact that there is an important change in speed of sound for the different gases, which affects the initial stage of the injection.

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Comparison of Diesel Spray Combustion in Different High-Temperature, High-Pressure Facilities

Cited by 255 publications

References 27 publications

An experimental analysis on the evolution of the transient tip penetration in reacting Diesel sprays

An experimental analysis on the evolution of the transient tip penetration in reacting Diesel sprays

Experimental characterization of diesel ignition and lift-off length using a single-hole ECN injector

Engine combustion network: Influence of the gas properties on the spray penetration and spreading angle

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