Numerical Simulation of Combustion for Freely Falling Gelled Fuel Droplets under Normal Gravity Conditions


Article Preview

Understanding the evaporation and combustion mechanisms of single droplets of gel propellant is the first stage to predict the burning characteristics in the combustion chamber. This paper, taking into account convection heat for freely falling gelled fuel droplets under normal gravity conditions, as well unsteady mass diffusion and thermal diffusion inside droplet, a theoretical model was developed to understand mass and heat transport mechanisms, and bubble growth within the gel droplet during processes of droplet combustion. The results show that at the first stage, shrinkage of the radius obeys the d2-law; steep temperature gradient and fuel mass concentration gradient appear within droplet, especially region near droplet surface. At the second stage, liquid fuel near the gellant layer within droplet starts to boiling, gellant layer formation resist the vaporizing fuel gas flow to extent; the vapor region appears between gellant layer and vaporizing surface within the droplet, and the droplet expands, swells, the layer thickness decreases until it ruptures.



Edited by:

Mohamed Othman




Z. J. Liu et al., "Numerical Simulation of Combustion for Freely Falling Gelled Fuel Droplets under Normal Gravity Conditions", Applied Mechanics and Materials, Vols. 229-231, pp. 2106-2111, 2012

Online since:

November 2012




[1] B. Natan, S. Rahimi, International Journal of Energetic Materials and Chemical Propulsion 5(1) (2002) 172-194.

[2] Larry C. Liou, John W. Dankanich, Leslie L. Alexander, in: 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2009, Paper No. AIAA-2009-5126.


[3] A. Kuznetsov, Y. Solomon, and B. Natan, in: 46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2010, Paper No. AIAA-2010-7124.


[4] Kristyadi T., Castanet G., Fuel 89 (2010) 3995-4001.

[5] Sergei S. Sazhin, Progress in Energy and Combustion Science 32 (2006) 162–214.

[6] R. Arnold, W. E. Anderson, in: 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010. Paper No. AIAA-2010-421.


[7] G. Nahamoni, B. Natan, in: 33rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 1997, Paper No. AIAA-1997-2973.


[8] G. Nachmoni, B. Natan, Combust Science and Technology 156 (2000) 139-157.

[9] Y. Solomon, B. Natan, Combustion Science and Technology 178 (2006) 1185-1199.

[10] Alina Kunin, Benveniste Natan, J. Barry Greenberg, Journal of Propulsion and Power 26 (4) (2010) 765-771.

[11] D. P. Mishra, A. Patyal, M. Padwal, Fuel 90 (2010) 1805-1810.