Micro-combustor is a major component in which the

Micro-combustor is a major component in which the
chemical energy of hydrocarbon is converted to thermal energy via combustion. The
major challenge in micro combustor is maintaining stable combustion. Most micro-combustors
operate with heterogeneous (catalytic) combustion rather than with pure gaseous
combustion. This is mainly because of large surface-to-volume ratios of micro combustors
that result in improved stability compared to those of pure gaseous combustion.
Conducting experiments in combustion characteristics in micro-scale devices are
difficult because measuring instrument causes disturbance to the microflame. Therefore,
computational fluid dynamics (CFD) simulation is applied to investigate the
micro-combustion mechanism. The development of multidimensional CFD models is
essential for the advancement of catalytically stabilized combustion (CST) to
commercial systems. In power generation there is increased interest for
hydrogen-assisted CST. Hydrogen and hydrogen-based fuels are gaining rapid
attention in recent years due to high energy densities compared to that of
batteries. Addition of small amounts of H2 in natural gas can reduce
the catalyst light-off temperature and can improve stability by damping
combustion-induced pulsations.

In the present work, Computational Fluid Dynamics (CFD)
based numerical simulations will be performed to study the combustion of hydrogen
assisted catalytic ignition of lean methane/air mixtures on platinum. The flame
structure and wall flame interactions will be studied extensively. Main
objective of this study is to evaluate flame stability of this micro-combustor
through numerical experiments. Thermal performance of the micro-combustor will
be analysed for variable inlet mass flow rates and different wall thermal
conductivities. The effects of micro-combustor dimension, thickness of wall and
combustion characteristics will be studied. Computational fluid dynamics code
FLUENT will be used to perform numerical simulations by solving the
conservation equations of energy, mass and momentum. The results of the numerical
simulations will then be compared to that of experimental results. Results of
this study will tell whether hydrogen assisted catalytic ignition of lean
methane/air mixtures is a viable choice for fuelling the micro-combustor.