Characteristics of Adhesion of Diesel Fuel on Impingement Disk Wall. Part 1: Effect of Impingement Area and Inclination Angle of Disk

Akop, Mohd Zaid; Zama, Yoshio; Furuhata, Tomohiko; Arai, Masataka

doi:10.1615/atomizspr.2013008113

Cited by 29 publications

(9 citation statements)

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“…For instance, Mathews et al 7 used a CCD camera to take photos of the film formation and evolution of the secondary droplets. Yu et al 8 and Akop et al 9,10 evaluated the film mass deposited on a disk-shaped wall during impingement under various conditions. Senda and colleagues 11,12 and Schulz et al 13,14 used laser-induced fluorescence (LIF) method in obtaining the fuel film geometry and the spatial distribution of the fuel thickness.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of spray impingement wall film under cold start conditions

Xiao

Parrish

et al. 2019

International Journal of Engine Research

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Fuel film that adhered on engine walls from spray impingement is considered a primary source of harmful combustion emissions. However, the physics of the wall film formation, propagation, and breakup is not fully understood yet because of its multiphase nature. Existing literature has revealed that the mass transportation within the fuel film takes a wave propagation form. This article aims to identify the dynamics of the wall film during spray impingement via high-speed laser diagnostics. In this work, a single-hole injector was used and the spray impinged onto a stage made of sapphire glass for diagnostics purposes. Iso-octane was used as the fuel and 10% ethanol was blended to dope rhodamine 6G as the fluorescent species for laser excitation. Simultaneous optical measurements, such as laser-induced fluorescence and Mie scattering, are performed to obtain the characteristics of the wall film quantitatively. Various aspects of the wall film, including the frequency of the wave, wave speed, and wave height, are inspected. The impact of fuel temperature and wall temperature under typical cold-start conditions are also studied to investigate the temperature dependence of the wall film dynamics. The research is also intended to provide quantitative experimental data for numerical models for impingement prediction and thus help the process of emission reduction and combustion optimization of internal combustion engines.

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Section: Introductionmentioning

confidence: 99%

Dynamics of spray impingement wall film under cold start conditions

Xiao

Parrish

et al. 2019

International Journal of Engine Research

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“…Fujimoto and colleagues [18][19][20][21] investigated the fuel spray impinging on the flat wall under both gasoline and diesel engine conditions. Akop et al [22][23][24][25] weighed the adhered fuel mass on an impingement disk wall and characterized the fuel adhesion under different conditions. Both Cheng et al 26 and Schulz and colleagues 27,28 conducted experimental studies on fuel adhesion using the laserinduced fluorescence (LIF) technique.…”

Section: Introductionmentioning

confidence: 99%

Effect of spray impingement distance on piston top fuel adhesion in direct injection gasoline engines

Luo

Nishida

Uchitomi

et al. 2018

International Journal of Engine Research

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Direct injection is an attractive technology for improving fuel economy and engine performance in gasoline engines. However, the adhered fuel formed on the piston surface has significant influence on the combustion efficiency and emissions. To obtain a better understanding of fuel adhesion, this work involved investigation of the spray and impingement on a flat wall through a mini-sac injector with a single hole. Different impingement distances and injection pressures were investigated. The evolution of the impinging spray was obtained by the Mie scattering method. The refractive index matching method was applied to measure fuel adhesion. The mass, area, and thickness of adhesion under different conditions were compared. The experimental results show that the fuel adhesion on the wall increases significantly with a large impingement distance. Moreover, the maximum thickness increases and the thickness uniformity of the fuel adhesion declines under a large impingement distance condition.

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“…Arai et al [12][13][14][15][16] had conducted a series experiments of diesel spray wall-impingement under non-evaporation conditions in a constant volume vessel. This showed that the quality of fuel adhered to the wall decreased with the increase of injection pressure, ambient pressure, Weber's number and the distance between the wall and spray tip.…”

Section: Introductionmentioning

confidence: 99%

Study on Fuel Distribution of Wall-Impinging Diesel Spray under Different Wall Temperatures by Laser-Induced Exciplex Fluorescence (LIEF)

et al. 2018

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Spray wall-impingement has large effects on the pollutant emissions and thermal efficiency of engines. Different wall temperatures can affect the gas-liquid phase transition of the spray, and the temperature gradient from the ambient to the wall will cause a different mixture process in the region nearby the wall. However, there are few studies on spray wall-impingement with different wall temperatures, particularly on the liquid-gas phase transition of the spray. Therefore, in this paper, the effects of different wall temperatures on spray-impingement have been investigated in a high-temperature, high-pressure constant volume combustion vessel. Cooling equipment was used to adjust the temperature difference between the wall and the ambient gas. n-Dodecane was chosen as the diesel surrogate to study the spray process. The spray wall-impingement was tested by changing the injection pressures (P i ) and wall temperatures (T w ). The ambient temperature (T a ) and ambient pressure (P a ) were kept constant at 773 K and 4 MPa, and the distance (L) between wall and injector was set to 35 mm to mimic the radius of the combustion chamber in heavy-duty diesel engines. A laser-induced exciplex fluorescence (LIEF) technique was used to probe the vapor and liquid phases of the injected fuel. Results show that the liquid phases of the spray do not reach the wall except in the condition of low wall temperature and high injection pressure. The liquid penetration develops and then becomes constant after 1 ms from the start of injection. With the increase of injection pressures (600-1600 bar), the liquid concentration of the spray decreases; however the liquid penetration decreases insignificantly. The wall temperature and the injection pressure have little influence on the liquid interpenetration process. For the vapor phase of the spray, the high concentration regions (equivalence ratio (φ) > 1) mainly distribute in the area of 10 mm away from the impact point on the wall. With the decrease of wall temperatures, the high-concentration regions are enlarged at the near wall regions. However, at the injection pressure of 1600 bar, the influence of wall temperatures on the equivalence ratio is small. The decreasing wall temperature deteriorates the mixing process of the fuel and ambient gas, but the effect is weakened with the increase of injection pressure.

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Characteristics of Adhesion of Diesel Fuel on Impingement Disk Wall. Part 1: Effect of Impingement Area and Inclination Angle of Disk

Cited by 29 publications

References 0 publications

Dynamics of spray impingement wall film under cold start conditions

Dynamics of spray impingement wall film under cold start conditions

Effect of spray impingement distance on piston top fuel adhesion in direct injection gasoline engines

Study on Fuel Distribution of Wall-Impinging Diesel Spray under Different Wall Temperatures by Laser-Induced Exciplex Fluorescence (LIEF)

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