Phenomenological models for prediction of spray penetration and mixture properties for different injection profiles

Dhar, Atul; Tauzia, Xavier; Maiboom, Alain

doi:10.1016/j.fuel.2015.12.022

Cited by 9 publications

(3 citation statements)

References 30 publications

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“…According to equation (1), when supersonic conditions are reached, the density reduces locally in the vicinity of spray. From spray propagation theory, it is known that the density affects penetration with an exponent equal to -0.25 [3,24], so lower density would be translated into a larger spray penetration. Knowing this, it is possible to estimate the supersonic spray penetration at each time step from the subsonic one as:…”

Section: Spray Penetration Correction In Supersonic Conditionsmentioning

confidence: 99%

Scaling spray penetration at supersonic conditions through shockwave analysis

Salvador

Morena

Taghavifar

et al. 2020

Fuel

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In the current paper, an investigation of the supersonic flow effect on shockwave generation and diesel spray penetration scaling has been performed. For this purpose, spray visualization tests have been carried out in a constant-pressure chamber at room temperature using shadowgraphy technique. Two working gases have been used: nitrogen, with similar thermodynamic characteristics to the engine environment, and sulfur hexafluoride, aimed at producing supersonic conditions at moderate injection pressure values. A total of 60 operating points, including different nozzle geometries, injection pressures and chamber densities have been studied. From the visualization study, two different kinds of shockwaves have been detected: normal or frontal, for moderate spray tip Mach (between 1 and 1.5); and oblique, when the Mach is higher than 1.5. The penetration results show that, for the same injection conditions in terms of injection pressure and chamber density, the spray propagation is equal for SF6 and N2 when the spray is on subsonic conditions, while penetration is higher for SF6 when supersonic velocity is reached. This behavior has been related to the density gradient appearing across the shockwave. A new methodology to extrapolate supersonic penetration from the well-known subsonic penetration law has been proposed, showing good agreement with the experimental results.

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Section: Spray Penetration Correction In Supersonic Conditionsmentioning

confidence: 99%

Scaling spray penetration at supersonic conditions through shockwave analysis

Salvador

Morena

Taghavifar

et al. 2020

Fuel

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show abstract

“…Dhar et al 95 suggested simple correlations for twostage injection based on the Naber and Siebers. 55 By assuming the spray velocity profile and equivalence ratio of two injection pulses to be independent of each other, the author determined the position of the entrainment wave head in different injection profiles, and the axial averaged velocity and equivalence ratio can be obtained in terms of entrainment wave advancement.…”

Section: Optimizations For Multiple Injectionsmentioning

confidence: 99%

A review of phenomenological spray penetration modeling for diesel engines with advanced injection strategy

Liu

Peng

Dai

et al. 2020

International Journal of Spray and Combustion Dynamics

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Driven by the increasingly remarkable problems of environmental pollution and energy crisis, the combustion optimization of diesel engine seems to be more urgent than ever, therefore, advanced injection strategies are gradually proposed and employed in modern diesel engines. Phenomenological model, which serves as an effective tool to conduct the parametric study on the spray penetration, needs to be improved to fit the intensified injection condition. Since that there are no attempts to review the spray penetration model developments, in order to help to build a comprehensive understanding of diesel spray propagation, this article briefly summarized the early history and introduced the widely used classical and improved phenomenological spray penetration models. Besides, to provide a helpful reference for selection of suitable models, the modeling methods were analyzed and features and simulation of various models were discussed and compared. After that, the trend of modeling methods and promising directions for future spray modeling were suggested.

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“…Significant effort has been also made in the modeling of diesel sprays [33][34][35][36]. Onedimensional phenomenological models, based on the gaseous jet analogy, have shown to be useful to evaluate the main spray features both in stationary and transient conditions [37,38]. Nevertheless, microscopic details of the spray such as the droplet velocity and diameter or the turbulence characteristics cannot be evaluated using these methodologies.…”

Section: Uthmentioning

confidence: 99%

Experimental investigation of the effect of orifices inclination angle in multihole diesel injector nozzles. Part 2 – Spray characteristics

Payri

Salvador

Morena

et al. 2018

Fuel

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Diesel spray development is a key research topic due to its impact on the combustion characteristics. On the current paper, the effect of the orifices inclination angle on the spray penetration characteristics is evaluated. For this purpose, three nozzles with included angles of 90, 140 and 155 degrees are selected. Visualization tests are performed on a room-temperature constant-pressure vessel pressurized with a high-density gas (SF6), in order to reproduce the density conditions inside the combustion chamber at the start of the injection event. Both frontal and lateral Mie-scattering visualization are used, depending on the particular nozzle configuration. Results show how the spray penetration is slower as the inclination angle increases, which is linked to its lower nozzle outlet 2 velocity. A statistical correlation of the spray penetration as a function of the area and velocity coefficients is obtained and discussed.

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Phenomenological models for prediction of spray penetration and mixture properties for different injection profiles

Cited by 9 publications

References 30 publications

Scaling spray penetration at supersonic conditions through shockwave analysis

Scaling spray penetration at supersonic conditions through shockwave analysis

A review of phenomenological spray penetration modeling for diesel engines with advanced injection strategy

Experimental investigation of the effect of orifices inclination angle in multihole diesel injector nozzles. Part 2 – Spray characteristics

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