Structure of lean premixed hydrogen-air flames in an annular microcombustor

Jejurkar, S.; Mishra, D.
September 2012
Combustion, Explosion, & Shock Waves;Sep2012, Vol. 48 Issue 5, p497
Academic Journal
Self-sustainable combustion and narrow stability limits are the most critical issues in microcombustors (length scale 1 mm) as increased heat losses can lead to thermal quenching of the flame. Hydrogen is a potential fuel for microcombustion due to its high specific energy and wide flammability limits. This work focuses on the lean premixed hydrogen-air flames stabilized in a newly developed annular microcombustor. Detailed axisymmetric numerical calculations involving multistep kinetics, multicomponent mass-heat transport, conjugate heat transfer, and thermal radiation in gas and solid media are performed. It has been shown that flame stabilization occurs by preheating even though wall temperatures are higher than the autoignition temperature. Results unravel the importance of H radical reactions in the kinetics of microflames in low- and high-temperature regions of the microcombustor.


Related Articles

  • Simulation of the rate of turbulent homogeneous combustion using the “quasi-laminar” approach. Kozlov, V. E.; Lebedev, A. B.; Sekundov, A. N.; Yakubovskii, K. Ya. // High Temperature;Dec2009, Vol. 47 Issue 6, p912 

    The possibility is considered of using a bulk (“quasi-laminar”) model of combustion for describing the rate of propagation of flame front in a turbulent flow of homogeneous fuel-oxidizer mixture. It is demonstrated that the analytical relation for the rate of propagation of flame...

  • NUMERICAL SIMULATION OF A PREMIXED TURBULENT V-SHAPED FLAME. El Khazen, Mohamed Issam; Benticha, Hmaied; Demoulin, Francois-Xavier; Jemni, Abdelmajid // Thermal Science;2011, Vol. 15 Issue 2, p311 

    In this paper we simulate a turbulent premixed V-shape flame stabilized on a hot wire. The device used is composed of a vertical combustion chamber where the methane-air mixture is convected upwards with a mean velocity of 4 m/s. The flow was simulated running Fluent 6.3, which numerically...

  • Computational Analysis of Hydrogen-Fueled Scramjet Combustor Using Cavities in Tandem Flame Holder. ROGA, S.; PANDEY, K. M. // Applied Mechanics & Materials;2015, Vol. 772, p130 

    This work presents the computational analysis of scramjet combustor using cavities in tandem flame holder by means of 3D. The fuel used by scramjet combustor with cavities in tandem flame holder is hydrogen, the fluid flow and the work is based on the species transport combustion with standard...

  • THEORETICAL AND EXPERIMENTAL VALIDATION OF HYDROGEN FUELED SPARK IGNITION ENGINE. Sakthinathan, Ganapathy Pandian; Jeyahandran, Krishnamoorthy // Thermal Science;2010, Vol. 14 Issue 4, p989 

    In modern research, simulation has become a powerful tool as it saves time and also economical when compared to experimental study. This paper deals with a comprehensive model of a spark ignition hydrogen fueled engine. Woschni's heat transfer co-relation is used by this model for predicting the...

  • Swirling Combustor Energy Converter: H2/Air Simulations of Separated Chambers. Minotti, Angelo; Teofilatto, Paolo // Energies (19961073);Sep2015, Vol. 8 Issue 9, p9930 

    This work reports results related to the "EU-FP7-HRC-Power" project aiming at developing micro-meso hybrid sources of power. One of the goals of the project is to achieve surface temperatures up to more than 1000 K, with a T = 100 K, in order to be compatible with a thermal/electrical conversion...

  • The use of Compound Cooling Holes for Film Cooling at the End Wall of Combustor Simulator. Che Sidik, Nor Azwadi; Salimi, Shahin // Applied Mechanics & Materials;2014, Issue 695, p371 

    Gas turbine cooling can be classified into two different schemes; internal and external cooling. In internal cooling method, the coolant provided by compressor is forced into the cooling flow circuits inside turbine components. Meanwhile, for the external cooling method, the injected coolant is...

  • Entropy generation during microcombustion. Li, Z. W.; Chou, S. K.; Shu, C.; Yang, W. M. // Journal of Applied Physics;4/15/2005, Vol. 97 Issue 8, p084914 

    We use an entropy balance to formulate the entropy generation equation in a flame zone of a cylindrical microcombustor tube. In deriving this equation, we define a nondimensional radius as the ratio of the tube radius to the flame thickness, and we set up a thermal model of the flame zone by...

  • Combustor improves dryer efficiency.  // Design News;12/16/91, Vol. 47 Issue 24, p39 

    Reports on Sandia National Labs' pulse combustor that offers high heat transfer rates and could lead to improved industrial dryers. Combustor's design; Drying rates; Key to efficient combustion; Major uses of pulse combustion.

  • A study of heat flux in a constant-volume combustion chamber. Lee, Chi-Woo; Kim, Chi-Won; Kim, Si-Pom // Proceedings of the Institution of Mechanical Engineers -- Part D;Sep2003, Vol. 217 Issue 9, p825 

    In the production of internal combustion engines, there has been a move towards the development of high-performance engines with fuel economy, lighter weights and smaller sizes. These trends help to answer problems related to thermal load and abnormal combustion, etc., in these engines. In order...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics