An Experimental Study on Mixture Formation Process of Flat Wall Impinging Spray Injected by Micro-Hole Nozzle under Ultra-High Injection Pressures

Wu, Zhang; Nishida, Keiya; Gao, Jian

doi:10.4271/2008-01-1601

Cited by 10 publications

(7 citation statements)

References 19 publications

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“…where M f [mg] is the mass of injected fuel and DS [m 2 ] is the unit projection area. Finally, the mass concentration of the droplets and vapor is obtained by applying equations (10) and (11), respectively…”

Section: Tracer Las Techniquementioning

confidence: 99%

“…It is determined that wall impingement has a more significant effect on the mixing rate compared to a free jet. Zhang et al 10 studied the effect of impingement on mixture formation by applying the laser absorption scattering (LAS) technique. The study demonstrated that the spray tip penetration length decreases with flat wall impingement; it has, however, a marginal influence on gas entrainment.…”

Section: Introductionmentioning

confidence: 99%

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Effect of split injection on mixture formation and combustion processes of diesel spray injected into two-dimensional piston cavity

Yang

Yamakawa

Nishida

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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The objective of this study is to obtain an enhanced understanding of the effect of split injection on mixture formation and combustion processes of diesel spray. A two-dimensional (2D) piston cavity of the same shape as that used in a small-bore diesel engine was employed to form the impinging spray flame. The fuel was injected into a high pressure, high temperature constant volume vessel through a single-hole nozzle with a hole diameter of 0.11 mm. The injection process comprised a pre-injection followed by the main injection. The main injection was carried out either as a single injection of injection pressure 100 MPa (Pre + S100), or by two types of split injection of injection pressure 160 MPa. The latter two types were defined by mass fraction ratios 1:1 and 3:1 (Pre + D160_1-1, Pre + D160_3-1). In order to observe the spray mixture formation process, the tracer laser absorption scattering (LAS) techique was adopted. Tracer LAS fuel with 97.5 vol% of n-tridecane and 2.5 vol% of 1-methylnaphthalene (a-MN) was employed. The spatial distributions of the vapor and liquid phases and the spray mixture formation characteristics in the 2D piston cavity for the three injection strategies were investigated. The diesel spray combustion and soot formation processes were studied using a highspeed video camera. The flame structure and soot formation process were examined using two-color pyrometry. The experimental results revealed that the split-injection vapor distribution was significantly more homogeneous than that of the single injection. The main injection fuel caught up with the pre-injection fuel and provided the spray tip with substantial additional momentum, enabling it to advance further. A high soot concentration and low temperatures appeared near the cavity wall region under the three injection strategies. The soot reduction rate for split injection was higher than that for single injection. The second main injection caught up with the previous injection's flame, which deteriorated the combustion and resulted in higher soot generation. The effect of split injection on the process of soot evolution finished at the same time as that of single injection.

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Section: Tracer Las Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of split injection on mixture formation and combustion processes of diesel spray injected into two-dimensional piston cavity

Yang

Yamakawa

Nishida

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Numerous research works to mention a few have been done on the combustion characteristics of biodiesel fuel in diesel engine [5][6][7][8]. Furthermore, recent works on the impact of high injection pressure and micro hole nozzle as effective methods of improving spray atomization and mixture preparation processes of diesel fuel in reducing particulate matters have been reported [9][10][11][12][13]. However, little or no significant work has been done on the role of injection pressure up to ultra-high level and micro-hole nozzle diameter size on the biodiesel spray, combustion, and soot formation characteristics using the constant volume vessel.…”

Section: Introductionmentioning

confidence: 99%

Characterization of spray and combustion processes of biodiesel fuel injected by diesel engine common rail system

Kuti¹,

Zhu²,

Nishida³

et al. 2013

Fuel

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148

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The influence of injection pressure up to ultra-high value of 300 MPa , nozzle hole diameters of 0.16 and 0.08 mm and fuel properties such as boiling point, cetane number and oxygen content on spray, ignition and combustion characteristics of biodiesel fuel in diesel engine were investigated. Biodiesel from palm oil source (BDF) and for comparison the JIS #2 diesel fuel were utilized. The Mie-scattering technique was used for characterizing the evaporating spray formation processes while the OH chemiluminescence technique was used to determine the ignition and the lift-off length of the combusting flame. Furthermore, the two color pyrometry was applied to study the soot formation processes. The results obtained indicated that due to higher boiling point, the BDF produced longer liquid phase length as compared to diesel. It was observed that the ignition region was larger for the 0.16mm nozzle as compared to the 0.08 mm. Due to the enhanced mixing processes, ignition delay decreased as the injection pressure increased from 100 to 300 MPa respectively and also by reducing the nozzle hole diameter to 0.08 mm. Higher cetane number and oxygen content of the BDF facilitated shorter ignition delay as compared to diesel. The percentage stoichiometry air entrained increased by decreasing the nozzle hole diameter. The BDF flame produced shorter lift-off length and lower percentage stoichiometry air. Under higher injection pressures and decreasing nozzle diameter, the BDF produced less soot as compared to diesel. The fuel oxygen content in the biodiesel fuel played a greater role in the soot formation processes.

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“…The application of higher injection pressure and smaller nozzle-hole size is believed to be the effective way to improve the spray atomization and mixture preparation process especially in the advanced combustion mode [Siebers et al, 2000;Minato et al, 2005;Tao et al, 2008;Zhang et al, 2008]. However, so far most of optical diagnostics researches were conducted with conventional injection pressure and relatively larger nozzle-hole size.…”

Section: Amdmentioning

confidence: 99%

Effects of Injection Pressure and Ambient Gas Density on Fuel - Ambient Gas Mixing and Combustion Characteristics of D.I. Diesel Spray

Zhu¹,

Kuti²,

Nishida³

2011

SAE Technical Paper Series

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I would like to express my greatest gratitude to my supervisor, Prof. Keiya Nishida, who grants me the opportunity to study in his laboratory and provides me with kind guidance and tutorship not only in the scientific research but also in the everyday life. It is impossible for me to achieve this accomplishment within the three years without his patient and thoughtful instruction. I also would like to thank the associate Prof. Yoichi Ogata in our laboratory, his kind instruction especially his experience in numerical simulation facilitates our research. I express my special compliment to China Scholarship Council (CSC), a non-profit institution affiliated with the Ministry of Education of China, who sponsors me the living expense in Japan. The China General Consulate in Osaka gives us the immediate response and suggestion as soon as we have need.

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An Experimental Study on Mixture Formation Process of Flat Wall Impinging Spray Injected by Micro-Hole Nozzle under Ultra-High Injection Pressures

Cited by 10 publications

References 19 publications

Effect of split injection on mixture formation and combustion processes of diesel spray injected into two-dimensional piston cavity

Effect of split injection on mixture formation and combustion processes of diesel spray injected into two-dimensional piston cavity

Characterization of spray and combustion processes of biodiesel fuel injected by diesel engine common rail system

Effects of Injection Pressure and Ambient Gas Density on Fuel - Ambient Gas Mixing and Combustion Characteristics of D.I. Diesel Spray

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