scholarly journals On the evolution of fuel droplet evaporation zone and its interaction with flame front in ignition of spray flames

Author(s):  
Qiang Li ◽  
Chang Shu ◽  
Huangwei Zhang
2011 ◽  
Vol 158 (12) ◽  
pp. 2559-2568 ◽  
Author(s):  
Jun Hayashi ◽  
Hiroaki Watanabe ◽  
Ryoichi Kurose ◽  
Fumiteru Akamatsu

2005 ◽  
Vol 127 (2) ◽  
pp. 199-203 ◽  
Author(s):  
Achintya Mukhopadhyay ◽  
Dipankar Sanyal

An algorithm for solution of a model for heating and evaporation of a fuel droplet has been developed. The objective of the work is to develop a computationally economic solution module for simulating droplet evaporation that can be incorporated in spray combustion CFD model that handles a large number of droplets. The liquid-phase transient diffusive equation has been solved semi-analytically, which involves a spatially closed-form and temporally discretized solution procedure. The model takes into account droplet surface regression, nonunity gas-phase Lewis number and variation of latent heat with temperature. The accuracy of the model is identical to a Finite Volume solution obtained on a very fine nonuniform grid, but the computational cost is significantly less, making this approach suitable for use in a spray combustion code. The evaporation of isolated heptane droplet in a quiescent ambient has been investigated for ambient pressures of 1 to 5 bar.


2017 ◽  
Vol 36 (2) ◽  
pp. 2401-2408 ◽  
Author(s):  
Jantarat Promvongsa ◽  
Pumyos Vallikul ◽  
Bundit Fungtammasan ◽  
Annie Garo ◽  
Gerard Grehan ◽  
...  

1997 ◽  
Vol 7 (3) ◽  
pp. 317-337 ◽  
Author(s):  
G. Chen ◽  
Suresh Aggarwal ◽  
Thomas A. Jackson ◽  
G. L. Switzer

Author(s):  
Amirmahdi Ghasemi ◽  
Mohammad Moghiman ◽  
Seyed Mohammad Javadi ◽  
Naseh Hosseini

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.


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