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

Payri, Raúl; Salvador, Francisco; Morena, Joaquín De la; Pagano, Vincenzo

doi:10.1016/j.fuel.2017.07.076

Cited by 19 publications

(8 citation statements)

References 53 publications

(53 reference statements)

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“…Liquid spray penetration is characterized on a constant pressure chamber at room temperature conditions (25ºC) [18]. A picture of this spray visualization chamber can be seen in Figure 1.…”

Section: Methodsmentioning

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: Methodsmentioning

confidence: 99%

Scaling spray penetration at supersonic conditions through shockwave analysis

Salvador

Morena

Taghavifar

et al. 2020

Fuel

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“…Figure 4 shows an example of the images obtained through the setup explained in the previous subsection. In general, the methodology described by Payri et al [16][17][18][19] was followed in order to obtain the spray information:…”

Section: Contour Determinationmentioning

confidence: 99%

Investigation of the urea-water solution atomization process in engine exhaust-like conditions

Payri

Bracho

Gimeno

et al. 2019

Experimental Thermal and Fluid Science

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“…A higher injection pressure (IP) enhances the interaction between ambient gases and droplets as a result of higher kinetic energy [12,22,38]. The turbulent and cavitation characteristics of an injector can be directly affected by the nozzle geometry and position [11,[39][40][41]. Moon et al [41] investigated the effect of the number (1, 3 and 6) nozzle holes with nozzle hole diameter 0.12 mm on the dynamic characteristics of diesel injection.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Injector Hole Diameter on Spray Behaviour for Butanol-Diesel Blends

2018

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Optimising the combustion process in compression ignition (CI) engines is of interest in current research as a potential means to reduce fuel consumption and emission levels. Combustion optimisation can be achieved as a result of understanding the relationship between spraying technique and combustion characteristics. Understanding macroscopic characteristics of spray is an important step in predicting combustion behaviour. This study investigates the impact of injector hole diameter on macroscopic spray characteristics (spray penetration, spray cone angle, and spray volume) of butanol-diesel blends. In the current study, a Bosch (0.18 mm diameter) and a Delphi (0.198 mm) injector were used. Spray tests were carried out in a constant volume vessel (CVV) under different injection conditions. The test blends were injected using a solenoid injector with a common rail injection system and images captured using a high-speed camera. The experimental results showed that the spray penetration (S) was increased with larger hole diameter. Spray penetration of a 20% butanol-80% diesel blend was slightly further than that of neat diesel. Spray penetration of all test fuels was increased as a result of increased injection pressure (IP), while spray cone angle (θ) was slightly widened due to the increase in either hole diameter or injection pressure. Spray volume of all test fuels was increased as a result of increased hole diameter or injection pressure. Thus, an efficient diesel engine performance can be achieved as a result of controlling injection characteristics, especially when using a promising additive like butanol blended with diesel.

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

Cited by 19 publications

References 53 publications

Scaling spray penetration at supersonic conditions through shockwave analysis

Scaling spray penetration at supersonic conditions through shockwave analysis

Investigation of the urea-water solution atomization process in engine exhaust-like conditions

The Impact of Injector Hole Diameter on Spray Behaviour for Butanol-Diesel Blends

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