Experimental Investigation of Gas Density Effects on Diesel Spray Penetration and Entrainment

Araneo, L.; Coghe, A.; Brunello, G.; Cossali, Gianpietro

doi:10.4271/1999-01-0525

Cited by 54 publications

(22 citation statements)

References 2 publications

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“…The spray cone angles predicted by the available models have been compared with the experimental data of spray cone angle obtained at the same condition [24]. The predicted value from only the Reitz model is found to be closely matched with the experimental data as shown in The SMD predicted by the available models have been compared with the experimental data at the same condition [25]. The predicted values from only the Hiroyasu1 model are found to be closely matched with the experimental data as shown in Figure 4.…”

Section: Model Selection and Calculationsmentioning

confidence: 80%

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Comparative evaluations of injection and spray characteristics of a diesel engine using karanja biodiesel-diesel blends

Subramanian

Lahane

2011

Int. J. Energy Res.

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SUMMARY The injection and spray characteristics of a diesel engine with 7.4‐kW rated power output for use of different karanja biodiesel blends (B10 and B20) are studied for identifications of further scope of performance improvement and emission reduction. The dynamic injection timing advanced for the biodiesel blends resulting in higher NOx emission, which increased from 2.94 g/kW‐hour with base diesel to 3.40 g/kW‐hour with B20. At the rated load, the dynamic injection timing advanced from 9.2 deg. crank angle before top dead centre (CA BTDC) with base diesel to 9.3 and 9.4 deg. CA BTDC for B10 and B20, respectively. The in‐line injection pressure increased from 460 bar with base diesel to 480 bar with B20, and in‐cylinder injection duration also increased from 9.5 deg. CA with base diesel to 10.2 deg. CA with B20. The penetration distance increased from 33.37 mm with base diesel to 34.80 mm and 34.25 mm with B10 and B20, respectively. Sauter mean diameter (SMD) increased from 11.39 µm with base diesel to 12.71 and 17.09 µm for B10 and B20, respectively, at the rated load. Air entrainment increases for the biodiesel blends, and it enhances the mixing rate of injected fuel with surrounding hot air. Vaporization time of biodiesel droplets increases because of larger SMD. However, increase in over penetration distance, large SMD and high vaporization time for the biodiesel blends would lead to deteriorated performance and emission characteristics of diesel engines. The remedial measures of spray characteristics for further performance improvement and emission reduction also are highlighted in the paper. Copyright © 2011 John Wiley & Sons, Ltd.

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Section: Model Selection and Calculationsmentioning

confidence: 80%

“…The predicted air entrainment was validated with experimental data available in literature . The predicted values from only the Rakapoulos model are found to be closely matched with the experimental data as shown in Figure .…”

Section: Model Selection and Calculationsmentioning

confidence: 99%

Comparative evaluations of injection and spray characteristics of a diesel engine using karanja biodiesel-diesel blends

Subramanian

Lahane

2011

Int. J. Energy Res.

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“…Both, spray penetration and drop size depend on the injection pressure, when ambient gas density and temperature are fixed. In a previous work [2] we studied the effects of gas density on Diesel spray penetration; different laser-based techniques were applied and the analysis of a large number of data allowed to propose a general correlation based on proper scaling of space, time and velocity. Nowadays a new interest is arising, derived from the concept of HCCI engine [7], where part of the fuel could be injected in the induction stroke or at the beginning of the compression stroke, when air temperature and density are much lower than in a conventional Diesel engine, and fuel could be reformulated to enhance evaporation and to control the ignition timing and the combustion rate.…”

Section: Introductionmentioning

confidence: 99%

Effect of Injection Conditions on Penetration and Drop Size of HCCI Diesel Sprays

Araneo

Coghe

2004

Thermo- And Fluid Dynamic Processes in Diesel Engines 2

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The development of direct injection strategies in modern Diesel engines needs increasingly high injection pressures and better fuel distribution in the combustion chamber. The ongoing study of the HCCI concept will probably require early fuel injection in air at low pressure and density, and also fuel composition will probably require some modification to reach a perfect mixing and to match evaporation and ignition requirements. In this work different common rail nozzles, fed with fuel supplied at constant pressure in the range from 30 to 100 MPa, are used to produce sprays in air at ambient temperature and pressure ranging from 1 to 7 bar, to investigate the spray penetration as a function of air and fuel pressure. From experimental results a scale low is then deduced, which is able to account for different penetration curves in the various tests by a unique common behaviour: a linear penetration part, whose length is function of the air density and of the nozzle diameter, followed by a decrease of the tip velocity. For a reduced set of experimental conditions drop size and velocity are measured by phase Doppler anemometry; time averaged mean diameter is then computed and analysed as a function of the fuel injection pressure, and shows a clear reduction of the drop diameter with increasing injection pressure.

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“…A similar approach is followed in [9,20] where the cone angle definition is associated to those of a symmetrical triangular shape, whose area is proportional to the binarized spray image one. Therefore, this method does not imply that the shape of the resulting model is close to the actual one or that the obtained value is independent on the used segmentation algorithm.…”

Section: Algorithmmentioning

confidence: 99%

“…Table 3 sums up the four adopted cone angle definitions. Apex-angle of a triangle having height equal to 0.5 S and corresponding equivalent area [4,9,20] Penetration S is evaluated from the binarized images, as the distance from the hole of a line orthogonal to the spray axis that individuates a region including the 99% of white pixels (the spray). Cone angle definitions (b) and (d) are based on such definition.…”

Section: Cone Angle and Penetration Definitionmentioning

confidence: 99%

Diesel Spray Macroscopic Parameter Estimation Using a Synthetic Shapes Database

Bottega

Dongiovanni

2019

Applied Sciences

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The paper presents a method for the macroscopic characterization of diesel sprays starting from digital images. Macroscopic spray characterization mainly consists in the definition of two parameters, namely penetration and cone angle. The latter can be evaluated according to many possible definitions, all based on the spray contour that is obtained by means of image thresholding. Therefore, the obtained cone angle value depends on the adopted angle definition and on the used thresholding algorithm. In order to avoid this double dependence, an alternative method has hence been proposed. The algorithm does not require the image thresholding and has an intrinsic cone angle definition. The algorithm takes advantage of principal component analysis technique and allows for a direct estimation of spray penetration and cone angle by comparing the original image with a database made of artificial spray images. In the present work, images coming from two different experiments are analyzed with the proposed method and results are compared with those obtained with a traditional procedure based on the Otsu’s image thresholding and four cone angle definitions.

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Experimental Investigation of Gas Density Effects on Diesel Spray Penetration and Entrainment

Cited by 54 publications

References 2 publications

Comparative evaluations of injection and spray characteristics of a diesel engine using karanja biodiesel-diesel blends

Comparative evaluations of injection and spray characteristics of a diesel engine using karanja biodiesel-diesel blends

Effect of Injection Conditions on Penetration and Drop Size of HCCI Diesel Sprays

Diesel Spray Macroscopic Parameter Estimation Using a Synthetic Shapes Database

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