Diesel Spray Combustion in an Ambient Gas Containing Hydrocarbon Using a Rapid Compression Machine. Effect of Low Temperature Reaction Processes with PropaneAir Premixed Gas.

The canonical diesel spray A is characterized in an optical Rapid Compression Machine (RCM) at high temperature and density conditions (900 K and 850 K, ρ = 23 kg/m3) using simultaneous high-speed OH* chemiluminescence and two-pulse 355 nm Planar Laser Induced Fluorescence (PLIF). The focus is on the time evolution and the repeatability of the early stages of both cool flame and hot ignition phenomena, and on the time evolution of the fluorescing formaldehyde region in between. In particular, time resolved data related to the cool flame are provided. They show the development of several separated kernels on the spray sides at the onset of formaldehyde appearance. Shortly after this phase, the cool flame region expands at high velocity around the kernels and further downstream towards the richer region at the spray head, reaching finally most of the vapor phase region. The position of the first high temperature kernels and their growth are then characterized, with emphasis on the statistics of their location. These time-resolved data are new and they provide further insights into the dynamics of the spray A ignition. They bring some elements on the underlying mechanisms, which will be useful for the validation and improvement of numerical models devoted to diesel spray ignition.

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Study on Premixed Combustion of Diesel Spray with High Pressure Fuel Injection and a Micro-Hole Nozzle Using a Rapid Compression Machine. 2nd Report, Improvement of Combustion Using Low Cetane Number Fuel.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.65.3502 ◽

1999 ◽

Vol 65 (638) ◽

pp. 3502-3508

Author(s):

Jinha LEE ◽

Hideyuki AKIYAMA ◽

Norimasa IIDA

Keyword(s):

High Pressure ◽

Fuel Injection ◽

Cetane Number ◽

Premixed Combustion ◽

Diesel Spray ◽

Rapid Compression Machine ◽

Micro Hole ◽

Rapid Compression

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Numerical simulation of n-dodecane spray combustion based on OpenFOAM

Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University ◽

10.1051/jnwpu/20213930539 ◽

2021 ◽

Vol 39 (3) ◽

pp. 539-548

Author(s):

Wengang Li ◽

Yinli Xiao ◽

Yipin Lu ◽

Zhibo Cao ◽

Juan Wu

Keyword(s):

High Temperature ◽

Low Temperature ◽

Fuel Injection ◽

Mixture Fraction ◽

Spray Combustion ◽

Combustion Model ◽

Temperature Reaction ◽

Penetration Length ◽

Chemical Reaction Kinetics ◽

Lift Off

For the purpose of providing the scientific insights to combustion characteristics of spray jet, numerical calculations of reacting and non-reacting spray cases are performed for ECN (engine combustion network) Spray A (n-dodecane spray combustion) which coupled finite chemistry combustion model PaSR and detailed chemical reaction kinetics based on OpenFOAM. The applicability and accuracy of the spray model is verified in the non-reacting spray case, and it is found that the predicted spray characteristics such as the penetration length of liquid and vapor and the mixture fraction are in good agreement with the test results. The two processes of low-temperature reaction and high-temperature ignition experienced by n-dodecane spray ignition are analyzed in reacting spray case, and it is found that the low-temperature reaction continues to exothermic before high-temperature ignition, and continues to proceed stably after high-temperature ignition, which promotes high-temperature ignition and flame stability. Finally, the effects of different fuel injection pressures on ignition delay time and flame lift-off length are studied.

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