Experimental studies on flame stabilization in a three step rearward facing configuration based micro channel combustor

Abstract In this study a detailed experimental analysis on the characterization of flame stability behaviour in a 2.0 mm support diameter micro-combustor with three rearward facing steps has been reported. Premixed mixture of methane–air has been used as a fuel for present investigations. Maximum and minimum diameter in the micro-combustor was maintained at 2 mm and 6 mm respectively. The effect of change in number of steps, length of steps, mixture equivalence ratios (ϕ) and flow rates on stability limits of flame and flame position has been investigated. It was observed that the zone of recirculation created due to the sudden expansion at the rearward step aids in stabilizing the flame inside the micro-combustor and improves the limits of flame stability significantly. The increase in the first and second step length helps in improving the lower and upper flame stability limits. The increase in the third step length affects the flame stability limit at higher flow rates only. Pollutants measurement shows that no NOx emissions were produced and CO emissions increase as the equivalence ratio (ϕ) increases.

[1]  Kaoru Maruta,et al.  Experimental investigations on the combustion behavior of methane–air mixtures in a micro-scale radial combustor configuration , 2007 .

[2]  D. G. Norton,et al.  Modeling of high-temperature microburners , 2002 .

[3]  S. D. Senturia,et al.  Macro Power from Micro Machinery , 1997, Science.

[4]  Aiwu Fan,et al.  Dynamic behavior of splitting flames in a heated channel , 2009 .

[5]  A. Carlos Fernandez-Pello,et al.  Micropower generation using combustion: Issues and approaches , 2002 .

[6]  Wei Liu,et al.  Regime diagrams and characteristics of flame patterns in radial microchannels with temperature gradients , 2008 .

[7]  Meng-Jing Wu,et al.  An improved micro-combustor design for micro gas turbine engine and numerical analysis , 2005 .

[8]  David B. Kittelson,et al.  Micro-HCCI combustion: experimental characterization and development of a detailed chemical kinetic model with coupled piston motion , 2003 .

[9]  R. Yetter,et al.  Development of a microreactor as a thermal source for microelectromechanical systems power generation , 2002 .

[10]  Kaoru Maruta,et al.  On the formation of multiple rotating Pelton-like flame structures in radial microchannels with lean methane–air mixtures ☆ , 2007 .

[11]  G. Gauba,et al.  Combustors for micro-gas turbine engines , 1998 .

[12]  Shigenao Maruyama,et al.  Flame stabilization and emission of small Swiss-roll combustors as heaters , 2005 .

[13]  K. B. Kim,et al.  Studies on a two-staged micro-combustor for a micro-reformer integrated with a micro-evaporator , 2008 .

[14]  Bhupendra Khandelwal,et al.  Experimental investigations on flame stabilization behavior in a diverging micro channel with premixed methane–air mixtures , 2010 .

[15]  Christopher P. Cadou,et al.  The role of structural heat exchange and heat loss in the design of efficient silicon micro-combustors , 2005 .

[16]  Bhupendra Khandelwal,et al.  Investigations into the flame stability limits in a backward step micro scale combustor with premixed methane–air mixtures , 2010 .

[17]  Kefa Cen,et al.  Effects of hydrogen addition on methane catalytic combustion in a microtube , 2007 .

[18]  Appearance of target pattern and spiral flames in radial microchannels with CH4-air mixtures , 2008 .

[19]  Claudio Bruno,et al.  Numerical simulations of a micro combustion chamber , 2009 .

[20]  Wenming Yang,et al.  Effects of major parameters on micro-combustion for thermophotovoltaic energy conversion , 2007 .

[21]  Paul D. Ronney,et al.  Numerical modeling of non-adiabatic heat-recirculating combustors , 2007 .

[22]  D. Olinger.  Modeling of Pressure and Temperature Development in Micro -Scale Combustion , 2005 .

[23]  Bhupendra Khandelwal,et al.  Experimental investigations on a new active swirl based microcombustor for an integrated micro-reformer system , 2011 .

[24]  Kaoru Maruta,et al.  Pattern formation of flames in radial microchannels with lean methane-air mixtures. , 2007, Physical review. E, Statistical, nonlinear, and soft matter physics.