Effect of ambient density and orifice diameter on gas entrainment by a single-hole diesel spray

Sepret, V.; Bazile, R.; Marchal, Moïse; Couteau, G.

doi:10.1007/s00348-010-0869-1

Cited by 35 publications

(19 citation statements)

References 20 publications

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“…The mass flow rate crossing this surface is calculated on 70% of the penetration, as with Choi et al 40 Results obtained for both atomization models at the end of injection are presented in Table 11. These results are very similar to the results of Choi et al 40 and Sepret et al, 41,42 validating the use of the 1% criterion on the maximum spray velocity. Then, the calculation of the entrained air-mass flow rate crossing this surface allows for determining the cumulated mixing rate, defined by…”

Section: Air Entrainmentsupporting

confidence: 90%

“…From a quantitative point of view, Choi et al 40 and Sepret et al 41,42 experimentally determined the entrained-air mass flow rate of a diesel spray, the latter using conditions very close in term of injection and ambient pressures to the present work but with a slightly different nozzle diameter (113 mm against 100 mm herein). In those papers, the authors defined a conical surface surrounding the spray to allow for calculating the mass flow rate of entrained air crossing this surface.…”

Section: Air Entrainmentmentioning

confidence: 68%

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Calibration strategy of diesel-fuel spray atomization models using a design of experiment method

Brulatout

Garnier

Mounaïm‐Rousselle

et al. 2016

International Journal of Engine Research

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The Reitz and Diwakar and the KHRT atomization models are widely used for high-pressure diesel-fuel spray. The constants in both models must be calibrated to correctly predict the injection process based on the nozzle geometry, injection conditions, and fuel. Calibration can be significantly time-consuming given the four constants in both models. This paper suggests a strategy to assess the impact of models' constants on spray tip penetration and mean droplet-diameter predictions on a reference case, with an injection pressure of 700 bar, to characterize the influence of the atomization model's calibration. The assessment used a design of experiment method (DOE), which demonstrated the important interaction between constants on the results. Obtained calibrations were used for comparing the models' performances qualitatively and quantitatively by accounting for spray and air-entrainment characteristics. Both models gave similar results, but the KHRT model yielded a better spray shape. Finally, based on DOE results, a method is proposed to modify the model's constants for higher pressures (900 and 1300 bar).

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Section: Air Entrainmentsupporting

confidence: 90%

Section: Air Entrainmentmentioning

confidence: 68%

Calibration strategy of diesel-fuel spray atomization models using a design of experiment method

Brulatout

Garnier

Mounaïm‐Rousselle

et al. 2016

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…7, the gas field around the spray is divided into three sections in both free and impinging sprays. These three main zones have been stated by Sepret et al (2010). In entrainment zone, the gas velocity vectors move into the spray.…”

Section: Fig 3 Comparison Of the Simulated Spray Shapes Of Free Andmentioning

confidence: 98%

Particle and Gas Flow Modeling of Wall-impinging Diesel Spray under Ultra-high Fuel Injection Pressures

Ghadimi

Yousefifard

Nowruzi

2017

JAFM

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Advanced models of spray breakup and droplet collision are implemented in OpenFOAM code for comparing the flat-wall impinging and free fuel sprays under ultra-high pressure direct injection diesel engines. The nonevaporating spray and ambient gas flow characteristics are analyzed by a combination of Eulerian and Lagrangian methods for continuous and dispersed phase, respectively. Various injection pressures and two different impinging distances are used. Reynolds Averaged Navier Stokes (RANS) equations are solved using standard k-ε turbulence model. Computational domain and grid size are determined based on a mesh study. Numerical results are validated by published experimental data for free and wall-impinging sprays. The robustness and accuracy of the proposed scheme are confirmed by comparing the main characteristics of spray and surrounding gas against published experimental data. To accomplish this, spray shape, penetration and gas velocity vectors are compared with experimental data and insightful understanding of the spray characteristics are provided. In comparison with free spray, tip penetration has been limited in impinging sprays. Turbulent flow in impinging sprays leads to more induced air motion. Also, impinging spray leads to more pushed-out gas velocity. The obtained results indicate that the numerical findings are generally in good agreement with experimental data in case of ultra-high injection pressures and micro-hole injectors.

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“…13, liquid fuel jet returns from the lateral edges of spray for all the blended fuels. This is due to the difference in fluid properties between the blended fuels and pure HFO (Sepret et al 2010).…”

Section: Liquid Spray Morphologymentioning

confidence: 99%

Effects of Heavy Fuel Oil Blend with Ethanol, n-Butanol or Methanol Bioalcohols on the Spray Characteristics

Ghadimi

Nowruzi

2016

JAFM

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Blending of fossil fuels with alcohols is one of the most impressive strategies for emission control and enhancement of fuel efficiency. Accordingly, in the current paper, the effects of blend of Heavy Fuel Oil (HFO) with bioalcohols are numerically studied on the non-reacting spray characteristics. Three different fuels are considered by mixture of HFO with 20% of n-Butanol, Ethanol, and Methanol and compared against Pure HFO. For this purpose, the microscopic and macroscopic spray characteristics of the blended fuels are evaluated through the investigation of spray penetration, cone angle, spray volume, and Sauter Mean Diameter (SMD). Moreover, for detailed understanding of the spray characteristics, the non-dimensional numbers of Weber and Ohnesorge, and liquid spray morphology are analyzed. Also, the study of Histogram of density and droplet diameter is conducted. Eulerian-Lagrangian multiphase scheme is used for simulation of air-fuel interaction in OpenFOAM CFD toolbox. Lagrangian Particle Tracking method is utilized for fuel droplet tracking in Lagrangian scheme. A hybrid breakup model of KH-RT and standard model of k-ε in RANS is used respectively for breakup and turbulence modeling. The obtained numerical results are validated against existing experimental data with suitable accordance. Based on the computational results, longer spray penetration length, larger spray cone angle and greater spray volume are achieved for the blended fuels. It was also concluded that HFO-Ethanol improves the macroscopic characteristics compared to two other blended fuels, albeit the effect is very minimal. In addition, lower SMD value is obtained for the blended fuels compared to pure HFO.

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Effect of ambient density and orifice diameter on gas entrainment by a single-hole diesel spray

Cited by 35 publications

References 20 publications

Calibration strategy of diesel-fuel spray atomization models using a design of experiment method

Calibration strategy of diesel-fuel spray atomization models using a design of experiment method

Particle and Gas Flow Modeling of Wall-impinging Diesel Spray under Ultra-high Fuel Injection Pressures

Effects of Heavy Fuel Oil Blend with Ethanol, n-Butanol or Methanol Bioalcohols on the Spray Characteristics

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