Effects of fuel droplet size on soot formation in spray flames formed in a laminar counterflow

2011 ◽  
Vol 158 (12) ◽  
pp. 2559-2568 ◽  
Author(s):  
Jun Hayashi ◽  
Hiroaki Watanabe ◽  
Ryoichi Kurose ◽  
Fumiteru Akamatsu
Keyword(s):  
Droplet Size ◽  
Soot Formation ◽  
Fuel Droplet ◽  
Spray Flames

Effects of Droplet Size and Air Preheating on Soot Formation in Turbulent Combustion of Liquid Fuel

2010 ◽  
Author(s):  
Amirmahdi Ghasemi ◽  
Mohammad Moghiman ◽  
Seyed Mohammad Javadi ◽  
Naseh Hosseini
Keyword(s):  
Droplet Size ◽  
Liquid Fuel ◽  
Soot Formation ◽  
Control Volume ◽  
Combustion Model ◽  
Inlet Temperature ◽  
Soot Emission ◽  
Fuel Droplet ◽  
Air Inlet ◽  
Spray Flames

The present study is concerned with the effect of fuel droplet size, air inlet preheating and air swirl number on complex soot process in a turbulent liquid-fuelled combustor. A hybrid Eulerian-Lagrangian method is employed to model the reactive flow-field inside the combustor. Equations governing the gas phase are solved by a control volume based semi-implicit iterative procedure while the time-dependent differential equations for each sizes of the fuel droplets are integrated by a semi-analytic method. The processes leading to soot consist of both formation and combustion. Soot formation is simulated using a two-step model while a finite rate combustion model with eddy dissipation concept is implemented for soot combustion. Also, mathematical models for turbulence, combustion, and radiation are used to take account the effects of these processes. Results reveal the significant influence of liquid fuel droplet size, air inlet temperatures and swirl numbers on soot emission from turbulent spray flames. The predictions show that reduction of spray droplet size and increases of air inlet temperature and swirl numbers considerably, increases soot emission from spray flames.

scholarly journals Study on Soot Formation in Spray Flames (Effect of Droplet Size Distribution)

2008 ◽  
Vol 74 (738) ◽  
pp. 429-437
Author(s):  
Jun HAYASHI ◽  
Fumiteru AKAMATSU ◽  
Chulju AHN ◽  
Takehiko SEO ◽  
Hiroaki WATANABE ◽  
...  
Keyword(s):  
Size Distribution ◽  
Droplet Size ◽  
Soot Formation ◽  
Droplet Size Distribution ◽  
Spray Flames

scholarly journals A Numerical Simulation of Soot Formation in Spray Flames

2007 ◽  
Vol 73 (731) ◽  
pp. 1570-1577
Author(s):  
Hiroaki WATANABE ◽  
Ryoichi KUROSE ◽  
Satoru KOMORI ◽  
Heinz PITSCH
Keyword(s):  
Numerical Simulation ◽  
Soot Formation ◽  
Spray Flames

On the Theoretical Prediction of Fuel Droplet Size Distribution in Nonreactive Diesel Sprays

2001 ◽  
Vol 124 (1) ◽  
pp. 182-185 ◽  
Author(s):  
Jianming Cao
Keyword(s):  
Distribution Function ◽  
Size Distribution ◽  
Droplet Size ◽  
Cross Sections ◽  
Droplet Size Distribution ◽  
Size Distribution Function ◽  
Fuel Droplet ◽  
Diesel Sprays ◽  
Mean Diameter ◽  
Higher Temperature

Droplet size distribution function and mean diameter formulas are derived using information theory. The effects of fuel droplet evaporation and coalescence within combustion chamber on the droplet size are emphasized in nonreactive diesel sprays. The size distribution function expressions at various spray axial cross sections are also formulated. The computations are compared with experimental data and KIVA-II code. A good agreement is obtained between numerical and experimental results. Droplet size distribution and mean diameter at various locations from injector exit and at various temperature conditions are predicted. The decreases of droplet number and variations of mean diameter are computed at downstream and higher temperature.

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