Effects of ultra-high injection pressure on penetration characteristics of diesel spray and a two-mode leading edge shock wave

Jia, Tao-Ming; Yu, Yusong; Xu, Yang-Jie

doi:10.1016/j.expthermflusci.2016.07.006

Cited by 32 publications

(18 citation statements)

References 26 publications

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“…cluded that high injection pressures are an effective way to mitigate the poor atomization characteristics of biodiesels. They stated as well that spreading spray angle was less affected by the injection pressure, an observation also reported by Jia et al (2016). Delacourt et al (2005) investigated the effect of injection pressure (up to 250 MPa) on the macroscopic spray characteristics, proving that correlations from Siebers (1998); Hiroyasu and Arai (1990) still described penetration trends correctly.…”

Section: Introductionsupporting

confidence: 53%

“…The spray was visualized by the Schlieren technique and a high-speed camera, and it was found that shock waves are present and propagated along the edge's spray in the downstream direction. Jia et al (2016) carried out an experimental study to investigate the effects of ultra-high injection pressure on the penetration characteristics of diesel sprays. They affirmed that a leading edge shock wave is generated after the spray exited the nozzle, followed by multiple shock waves shock waves around the spray body at a later stage.…”

Section: Introductionmentioning

confidence: 99%

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Effect of High Injection Pressures and Ambient Gas Properties Over the Macroscopic Characteristics of the Diesel Spray on Multi-Hole Nozzles

et al. 2018

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In this work, the effect of high injection pressures and ambient gas properties on diesel spray penetration and spreading angle are studied. To this end a multi-hole piezoelectric injector was used, and MIE-Scattering optical technique to visualize the spray. Injection pressures up to 270 MPa were used throughout the experiments. Additionally, the spray behavior going from subsonic to supersonic state was analyzed by controlling the ambient gas speed of sound, promoting in this way supersonic jets. For this purpose, measurements were done using three different ambient gases (SF 6 , CO 2 , and N 2) at isothermal conditions. The results showed that sprays near transonic or in supersonic state had a higher penetration rate than those in subsonic state. Furthermore, among the sprays near transonic or in supersonic state, those with higher Mach number had faster penetration. Differently, within the sprays at subsonic state, no significant variations in spray penetration rate were found, regardless of the difference in the Mach number. Shock waves appearances were pointed out as a possible explanation for the spray penetration variations observed. Finally, a statistical analysis is presented for the spray penetration under isothermal conditions and for each ambient gas.

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Section: Introductionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Effect of High Injection Pressures and Ambient Gas Properties Over the Macroscopic Characteristics of the Diesel Spray on Multi-Hole Nozzles

et al. 2018

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“…The method of spray observation adopted in this study is the Schlieren visualization technique [ 12 ]. The Schlieren apparatus enables the spray pattern within the CVSC to be monitored and recorded for onward image processing.…”

Section: Methodsmentioning

confidence: 99%

Analysis of diesel engine injector nozzle spray characteristics fueled with residual fuel oil

Achebe

Ogunedo

Chukwuneke

et al. 2020

Heliyon

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Experimental analysis on the spray characteristics of a diesel engine injector nozzle fueled with Residual Fuel Oil (RFO) was carried out in this study. To achieve this, the fuel was characterized to determine its physicochemical properties, and an experimental set up was designed to visualize and capture the spray pattern of the fuel. The images obtained were processed and analysed using Image J software to determine the spray length, spray cone angle, spray area, spray volume, and spray velocity values of the fuel. Experimental results obtained agree with validation models and reveal that spray parameter values of RFO are higher than those of diesel fuel. The values of spray parameters of RFO such as 456mm spray length, 2.85mm Sauter Mean Diameter (SMD) and the low spray cone angle of 12.69°, led to a higher spray volume causing the engine to run on a rich mixture after initial start-up conditions. This would create such challenges as reduction in power and clogging of injector nozzle tip due to an increase in carbon deposits. Regression models generated reveal that these challenges could be eliminated when the spray parameters run on optimal values of 256mm, 6.41cm 2 , 16.18cm 3 , 0.96 mm/s and 13.59° for the spray length, spray area, spray volume, spray velocity and the spray angle respectively. These optimal values were obtained when the engine fuel injection time was set to 500μs while running on fuel of viscosity 4.305 mPa.s and temperature of 48 °C.

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“…Another important aspect is the ambient density, which tends to reduce spray tip velocity due to the combined effect of higher aerodynamic forces and a wider spray angle [10,11]. Eventually, the combination of high ambient density with ultra-high injection pressure may lead to the detection of shock wave phenomena in the spray tip area, affecting also the spray behavior [12,13]. Spray penetration is also affected by the fuel physical properties, mainly density, viscosity and surface tension [14][15][16].…”

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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Effects of ultra-high injection pressure on penetration characteristics of diesel spray and a two-mode leading edge shock wave

Cited by 32 publications

References 26 publications

Effect of High Injection Pressures and Ambient Gas Properties Over the Macroscopic Characteristics of the Diesel Spray on Multi-Hole Nozzles

Effect of High Injection Pressures and Ambient Gas Properties Over the Macroscopic Characteristics of the Diesel Spray on Multi-Hole Nozzles

Analysis of diesel engine injector nozzle spray characteristics fueled with residual fuel oil

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

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