Correlating the Diesel Spray Behavior to Nozzle Design

Qin, Jian Rong; Dan, Tomohisa; Lai, Ming Chia; Savonen, Craig; Schwartz, E.G.; Brkyzik, Walter

doi:10.4271/1999-01-3555

Cited by 14 publications

(3 citation statements)

References 20 publications

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“…The large majority of current spray models introduce boundary/initial conditions at the nozzle exit (Qin et al, 1999;Ning et al, 2008;Som et al, 2011;Battistoni et al, 2012;Montanaro et al, 2014). This way, the smaller scales of nozzle flow characteristics are greatly damped or even lost and the spray development is mainly dictated by momentum and aerodynamics/mixing.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis on the Influence of Nozzle Geometry Over the Dispersion of Liquid N-Dodecane Sprays

2015

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Understanding and controlling mixing and combustion processes is fundamental in order to face the challenges set by the ever more demanding pollutant regulations and fuel consumption standards of direct injection diesel engines. The fundamentals of these processes haven been long studied by the diesel spray community from both experimental and numerical perspectives. However, certain topics, such as the influence of nozzle geometry over the spray atomization, mixing, and combustion process, are still not completely well understood and predicted by numerical models. The present study seeks to contribute to the current understanding of this subject, by performing state of the art optical diagnostics to liquid sprays injected through two singe-hole nozzles of different conicity. The experiments were carried out in a nitrogen-filled constantpressure-flow facility. Back pressures were set to produce the desired engine-like density conditions in the chamber, at room temperature. The experimental setup consists in a diffused back-illumination setup with a fast pulsed LED light source and a high-speed camera. The diagnostics focused on detecting the liquid spray contour and evaluating the influence of nozzle geometry over the time-resolved and quasi-steady response of the spray dispersion, at similar injection conditions. Results show a clear influence of nozzle geometry on spray contour fluctuations, where the cylindrical nozzle seems to produce larger dispersion in both time-resolved fluctuations and quasi-steady values, when compared to the conical nozzle. This evidences that the turbulence and radial velocity profiles originated at the cylindrical nozzle geometry are able to affect not only the microscopic scales inside the nozzle, but also macroscopic scales, such as the steady spray. Observations from this study indicate that the effects of the flow characteristics within the nozzle are carried on to the first millimeters of the spray, in which the rest of the spray formation downstream is pre-defined.

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Section: Introductionmentioning

confidence: 99%

Experimental Analysis on the Influence of Nozzle Geometry Over the Dispersion of Liquid N-Dodecane Sprays

2015

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“…The author concluded that change in nozzle geometry influences the atomization process. Importantly discharge coefficient and initial amplitude parameter are so important as they could be varied by the aspect ratio of the nozzle, needle valve shape and discharge direction [3]. Chang Sik Lee et al 3 .…”

Section: In -Cylinder Spraymentioning

confidence: 99%

“…Importantly discharge coefficient and initial amplitude parameter are so important as they could be varied by the aspect ratio of the nozzle, needle valve shape and discharge direction [3]. Chang Sik Lee et al 3 . studied about the microscopic spray structure of diesel injector, spray tip penetration, particle motion analysis system at various injection pressures by using the Doppler particle analyzer.…”

Section: In -Cylinder Spraymentioning

confidence: 99%