Advanced modeling of spray combustion process in airbreathing propulsion combustors

1987 ◽  
Author(s):  
H. CHIU
Keyword(s):  
Combustion Process ◽  
Spray Combustion

Simultaneous Imaging of OH* Chemiluminescence and Flame Luminosity of Diesel and Biodiesel Spray Combustion

2011 ◽  
Author(s):  
Ji Zhang ◽  
Tiegang Fang
Keyword(s):  
Ambient Temperature ◽  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Soot Formation ◽  
Combustion Process ◽  
Spray Combustion ◽  
Chemiluminescence Intensity ◽  
High Temperature Reaction ◽  
The Impact

The research on the spray combustion of diesel and biodiesel is vital to the understanding of emission formation and optimal utilization of fuel. This paper studies the biodiesel and diesel spray combustion in a constant volume chamber under different simulated diesel engine conditions. The ambient temperature at fuel injection varied from 800K to 1200K, while the ambient oxygen concentration was maintained at 21%. Simultaneous high speed imaging of OH* chemiluminescence and flame luminosity was employed to visualize the whole combustion process. Heat release rate was analyzed based on the measured combustion pressure. The apparent heat release rate analysis shows that biodiesel has a shorter ignition delay time than diesel, and biodiesel has a smaller cumulative heat release value due to its lower heating value. The overlaying image of OH* chemiluminescence and flame luminosity clearly identifies the high temperature reaction regions and soot formation regions. The line-of-sight images agree with the published observation that the hydroxyl radical is formed on the lean side of the flame edge. Decreasing ambient temperature greatly reduces the OH* chemiluminescence intensity of the diesel combustion, while the impact is smoother and milder for biodiesel combustion. Biodiesel shows a significantly lower level of flame luminosity than diesel under all conditions. These combined observations lead to a speculation that the soot oxidation process may serve as an important contributor to OH* chemiluminescence intensity for late stage combustion, and biodiesel shows a tendency to produce less soot than diesel under the investigated conditions.

UV-Visible Emission Spectroscopy of the Combustion Process in a Common Rail Cl Engine Fulled with N-Butanol - Diesel Blends

2013 ◽  
Vol 390 ◽  
pp. 286-290 ◽  
Author(s):  
Cinzia Tornatore ◽  
Luca Marchitto ◽  
Simona Silvia Merola ◽  
Gerardo Valentino
Keyword(s):  
Emission Spectroscopy ◽  
Soot Formation ◽  
Combustion Process ◽  
Common Rail ◽  
Injection System ◽  
Optical Data ◽  
Spray Combustion ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Uv Visible

This paper is focused on the study of the effects of the injection strategy and fuel blends on spray combustion and soot formation in compression ignition engines. UV-visible natural emission spectroscopy was applied in the combustion chamber of a single cylinder high swirl compression ignition engine equipped with a common rail multi-jet injection system. The engine was fuelled with low-sulphur neat diesel and blended with 20 and 40% by volume of n-butanol. For all the fuels, the evolution of radical species, such like OH and soot was followed during the spray combustion processes examining different pilot-main dwell timings. Optical data were correlated to engine parameters and exhaust emissions.

scholarly journals Spray, Combustion, and Air Pollutant Characteristics of JP-5 for Naval Aircraft from Experimental Single-Cylinder CRDI Diesel Engine

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2362
Author(s):  
Hyungmin Lee
Keyword(s):  
Diesel Engine ◽  
Ignition Delay ◽  
Fuel Injection ◽  
Cetane Number ◽  
Combustion Process ◽  
Air Pollutant ◽  
Spray Combustion ◽  
Injection Timing ◽  
Visualization System ◽  
Single Cylinder

This study was performed to analyze the spray, combustion, and air pollutant characteristic of JP-5 fuel for naval aircraft in a spray visualization system and a single-cylinder CRDI diesel engine that can be visualized. The analysis results of JP-5 fuel were compared with DF. The spray tip penetration of JP-5 showed diminished results as the spray developed. JP-5 had the highest ROHR and ROPR regardless of the fuel injection timings. The physicochemical characteristics of JP-5, such as its excellent vaporization and low cetane number, were analyzed to prolong the ignition delay. Overall, the longer combustion period and the lower heat loss of the DF raised the engine torque and the IMEP. JP-5 showed higher O2 and lower CO2 levels than the DF fuel. The CO emission level increased as the injection timing was advanced in two test fuels, and the CO emitted from the DF fuel, which has a longer combustion period than JP-5, turned out to be lower. NOx also reduced as the fuel injection timing was retarded, but it was discharged at a higher level in JP-5 due to the large heat release. The images from the combustion process visualization showed that the flame luminosity of DF is stronger, its ignition delay is shorter, and its combustion period is longer than that of JP-5.

scholarly journals Experimental Study on the Unsteady Spray Combustion Process of a Liquid Oxygen/Methane Swirl Coaxial Injector

ACS Omega ◽  
2021 ◽  
Vol 6 (40) ◽  
pp. 26191-26200
Author(s):  
Pengjin Cao ◽  
Xiao Bai ◽  
Qinglian Li ◽  
Peng Cheng ◽  
Ziguang Li
Keyword(s):  
Experimental Study ◽  
Combustion Process ◽  
Liquid Oxygen ◽  
Spray Combustion ◽  
Coaxial Injector

Computational Modeling of Turbulent Spray Combustion Process Using RANS and Large-Eddy Simulations

2022 ◽  
Vol 35 (1) ◽  
Author(s):  
Guillermo Guevara-Morales ◽  
Oliver M. Huerta-Chavez ◽  
Isidro Castorena ◽  
Raul Bernal-Orozco ◽  
Jaime Cruz-Cruz ◽  
...  
Keyword(s):  
Computational Modeling ◽  
Combustion Process ◽  
Large Eddy Simulations ◽  
Spray Combustion ◽  
Turbulent Spray Combustion ◽  
Large Eddy ◽  
Turbulent Spray
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