Microscopic characterization of isooctane spray in the near field under flash boiling condition

Wang, Ziman; Wang, Bo; Jiang, Changzhao; Xu, Hongming; Badawy, Tawfik

doi:10.1016/j.apenergy.2016.07.115

Cited by 30 publications

(6 citation statements)

References 19 publications

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“…A similar spray collapse was reported by Xu et al [13]. They investigated the effect of flash boiling on gasoline, ethanol, methanol and n-hexane sprays formed at different injection pressures (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15). They focused on the flash-boiling effects in terms of three spray-formation regimes: subcooled, transitional and flare flash-boiling.…”

Section: Introductionsupporting

confidence: 57%

“…According to the study of Vanderwege and Hochgreb [3], for the same liquid, a superheat degree of about 20 K is needed to detect noticeable changes in the spray structure. More recently, Wang et al [10] studied the influence of injection pressure on iso-octane sprays formed under flash-boiling conditions by a single-hole injector. They reported that the higher injection pressure led to a narrower spray angle.…”

Section: Introductionmentioning

confidence: 99%

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Liquid Propane Injection in Flash-Boiling Conditions

et al. 2021

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This study aimed to investigate the influence of flash-boiling conditions on liquid propane sprays formed by a multi-hole injector at various injection pressures. The focus was on spray structures, which were analysed qualitatively and quantitatively by means of spray-tip penetration and global spray angle. The effect of flash boiling was evaluated in terms of trends observed for subcooled conditions. Propane was injected by a commercial gasoline direct injector into a constant volume vessel filled with nitrogen at pressures from 0.1 MPa up to 6 MPa. The temperature of the injected liquid was kept constant. The evolution of the spray penetration was observed by a high-speed camera with a Schlieren set-up. The obtained results provided information on the spray evolution in both regimes, above and below the saturation pressure of the propane. Based on the experimental results, an attempt to calibrate a simulation model has been made. The main advantage of the study is that the effects of injection pressure on the formation of propane sprays were investigated for both subcooled and flash-boiling conditions. Moreover, the impact of the changing viscosity and surface tension was limited, as the temperature of the injected liquid was kept at the same level. The results showed that despite very different spray behaviours in the subcooled and flash-boiling regimes, leading to different spray structures and a spray collapse for strong flash boiling, the influence of injection pressure on propane sprays in terms of spray-tip penetration and spray angle is very similar for both conditions, subcooled and flash boiling. As for the numerical model, there were no single model settings to simulate the flashing sprays properly. Moreover, the spray collapse was not represented very well, making the simulation set-up more suitable for less superheated sprays.

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Section: Introductionsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Liquid Propane Injection in Flash-Boiling Conditions

et al. 2021

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“…Wang et al [15] studied the near nozzle single hole spray pattern under flash boiling conditions and observed increased cone angle and spray area when flash boiling occurs. Wu et al [16] studied 1-hole, 2-holes, and 6-holes sprays at near nozzle region from flare flash to sub-cooled conditions.…”

Section: Introductionmentioning

confidence: 99%

Study of spray collapse phenomenon at flash boiling conditions using simultaneous front and side view imaging

Mohan

Sim

et al. 2020

International Journal of Heat and Mass Transfer

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Flash boiling has become a topic of interest to researchers due to its potential of achieving good fuel atomization and negative influence on GDI engine emissions when spray collapses and spray-wall impingement exists. Under flash boiling conditions, the accompanying spray collapse phenomenon and plume interaction are not clearly elucidated. Simultaneous side view diffused back illumination (DBI) and front view Mie-scattering were implemented in this work to capture transient plume to plume interaction of iso-octane fuel spray from a 10 hole gasoline direct injection (GDI) injector at flash boiling conditions. Fuel temperature and ambient gas pressure were varied in a wide range to cover collapse, transitional and non-flashing regimes. Two new criteria named 'spray collapse percentage', defined based on the front view Mie-scattering technique and 'optical thickness' based on the side view DBI

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“…Experimental studies using single hole injector showed that under flash boiling conditions, liquid penetration length reduces compared to normal fuel temperature cases. [34][35][36][37] However, spray characteristics are entirely different for multi-hole GDI injector. Chamber pressure and fuel temperature are generally responsible for fuel flashing.…”

Section: Introductionmentioning

confidence: 99%

Optical investigation of flash boiling and its effect on in-cylinder combustion for butanol isomers andiso-octane

Kale

Banerjee

2020

International Journal of Engine Research

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Performance of a gasoline direct injection engine significantly depends on the fuel injection phenomenon. It has been shown that variation in the fuel thermo-physical properties and in-cylinder thermodynamic conditions can adversely affect engine performance. Spray collapse due to flash boiling is the consequence of such varying in-cylinder thermodynamics. It has also been observed that gasoline direct injection engines have higher particulate matter emissions compared to port fuel injection engines. One of the possible reasons for this observation may be fuel impingement on the piston head and spray collapse at high fuel injector temperature. In the present work, experiments have been performed to understand spray characteristics under flash boiling conditions and ultimately its effect on in-cylinder combustion quality for the three different fuels: n-butanol, iso-butanol and iso-octane. To mimic in-cylinder conditions, hot fuel was introduced inside an optically accessible engine. It was observed that fuel temperature and their thermo-physical properties have a significant effect on piston head wetting and pool fire on the piston top. Butanol isomers showed significant reduction in sooty combustion with increase in fuel temperature. However, iso-octane showed higher wall wetting at elevated fuel temperature due to spray collapse.

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Microscopic characterization of isooctane spray in the near field under flash boiling condition

Cited by 30 publications

References 19 publications

Liquid Propane Injection in Flash-Boiling Conditions

Liquid Propane Injection in Flash-Boiling Conditions

Study of spray collapse phenomenon at flash boiling conditions using simultaneous front and side view imaging

Optical investigation of flash boiling and its effect on in-cylinder combustion for butanol isomers andiso-octane

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