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Journal of Energy
Volume 2015, Article ID 397219, 10 pages
Research Article

The Effects of Air Preheating and Fuel/Air Inlet Diameter on the Characteristics of Vortex Flame

1High-Speed Reacting Flow Laboratory, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia (UTM), 81310 Skudai, Johor, Malaysia
2Department of Environmental Engineering, College of Engineering, Komar University of Science and Technology (KUST), King Mahmud Circle, Sulaymaniyah, Kurdistan, Iraq

Received 28 September 2014; Revised 8 April 2015; Accepted 26 April 2015

Academic Editor: David Kubička

Copyright © 2015 Mostafa Khaleghi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The effects of fuel/air inlet diameter as well as air preheating on the flame stability, temperature distribution, pollutant formation, and combustion characteristics of a lab-scaled asymmetric vortex flame have been investigated. A three-dimensional steady-state finite volume solver has been used to solve the governing and energy equations. The solver uses a first-order upwind scheme to discretize the governing equations in the space. The semi-implicit method for pressure linked equations has been applied to couple the pressure to the velocity terms. Several turbulence models were applied to predict the flame temperature and it was found that RNG has given the best results in accordance with the experimental results. The results reveal that the inlet air diameter can enhance the thermal properties and reduce the emission while the inlet fuel diameter has less significant impact. Increasing diameters are accompanied with a pressure drop. It was found that preheating the air and fuel would significantly affect the flame temperature and emission with constant mass flow rate.