Numerical Analysis on the CO-NO Formation Production near Burner Throat in Swirling Flow Combustion System


  • Mohamad Shaiful Ashrul Ishak School of Manufacturing Engineering, Universiti Malaysia Perlis,P.O Box 77, Pejabat Pos Besar, 01000 Kangar, Perlis, Malaysia
  • Mohammad Nazri Mohd Jaafar Department of Aeronautics, Automotive & Ocean Engineering, Faculty of Mechanical Engineering,Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia



Swirler, combustor, carbon monoxide, pollutant NO, CFD simulation


The main purpose of this paper is to study the Computational Fluid Dynamics (CFD) prediction on CO-NO formation production inside the combustor close to burner throat while varying the swirl angle of the radial swirler. Air swirler adds sufficient swirling to the inlet flow to generate central recirculation region (CRZ) which is necessary for flame stability and fuel air mixing enhancement. Therefore, designing an appropriate air swirler is a challenge to produce stable, efficient and low emission combustion with low pressure losses. A liquid fuel burner system with different radial air swirler with 280 mm inside diameter combustor of 1000 mm length has been investigated. Analysis were carried out using four different radial air swirlers having 30°, 40°, 50° and 60° vane angles. The flow behavior was investigated numerically using CFD solver Ansys Fluent. This study has provided characteristic insight into the formation and production of CO and pollutant NO inside the combustion chamber. Results show that the swirling action is augmented with the increase in the swirl angle, which leads to increase in the center core reverse flow, therefore reducing the CO and pollutant NO formation. The outcome of this work will help in finding out the optimum swirling angle which will lead to less emission.  


Mathur, D. L. 1974. A New Design of Vanes for Swirl Generation. IE (I) Journal Me. 55: 93–96.

Fricker, N. and Leuckel, W. 1976. The Characteristic of Swirl Stabilized Natural Gas Flame Part 3: The Effect of Swirl and Burner Mouth Geometry on Flame Stability. J. Inst. Furl. 49: 152–158.

Mestre, A and Benoit, A. 1973. Combustion in Swirling Flow. 14th Symposium (International) on Combustion, The Combustion Institute. Pittersburg. 719.

Chervinskey, A. and Manheimertiment, Y. 1968. Effect of Swirl on Flame Stabilization. Israel Journal of Technology. 6(2): 25–31.

Tian, Z. F., Witt, P. J., Schwarz, M. P., & Yang, W. 2010. Numerical Modelling of Victorian Brown Coal Combustion in a Tangentially Fired Furnace. Energy & Fuels. 24(9): 4971–4979.

Khalil, K. H., El-Mehallawy, F. M. and Moneib, H. A. 1977. Effect of Combustion Air Swirl on the Flow Pattern in a Cylindrical Oil Fired Furnace, 16th Symposium (International) on Combustion, The Combustion Institute, Pittersburg. 135–143.

Apack, G. 1974. Interaction of Gaseous Multiple Swirling Flames. Phd Thesis. Department of Chemical Engineering and Fuel Technology, University of Sheffield.

Gupta, A. K., Lilley, D. G. and Syred. 1984. N. Swirl Flows. Abacus Press, Tunbridge Wells, England.

Chen R. H. and Driscoll J. F. 1988. The Role of the Recirculation Vortex in Improving Fuel-air Mixing within Swirling Flames. 22nd Symposium (International) on Combustion. The Combustion Institute, Pittsburgh. 531–54.

Beer, J. M., Chigier, N. A. 1972. Combustion Aerodynamics. Applied Science Publisher, London.

Kim, Y. M., Chung, T. J. 1989. Finite- Element Analysis of Turbulent Diffusion Flames. AIAA J. 27(3): 330–339.

Versteeg, H. K., Malalasakera, W. 1995. An Introduction to Computational Fluid Dynamics, the Finite Volume Method. Longman Group Ltd.

FLUENT 14.0 User's Guide, Fluent Inc. 2012.

King, P. T., Andrews, G. E., Pourkashanian, M. M., & McIntosh, A. C. 2012. Nitric Oxide Predictions for Low NOx Radial Swirlers With Central Fuel Injection Using CFD. In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition American Society of Mechanical Engineers. 985–993.

Zhou, W., Moyeda, D., Payne, R., & Berg, M. 2009. Application of numerical simulation and full scale testing for modeling low NOX burner emissions. Combustion Theory and Modelling. 13(6): 1053–1070.




How to Cite

Numerical Analysis on the CO-NO Formation Production near Burner Throat in Swirling Flow Combustion System. (2014). Jurnal Teknologi, 69(2).