Numerical Investigation on Flame Dynamics of Premixed Hydrogen-Air Flame in a Sudden Converging-Diverging Microscale Tube

摘要

The development of small-scale devices like drones, robots, micro-air vehicles, and other various electronics devices is receiving strong demand and great attention from the research community. There has been a growing interest in the development of micro-power generation devices due to their simple structure and non-moving parts. Combustion of hydrocarbons fuels is more intriguing because of its high energy density, which is almost 20-50 times higher than the most advanced Li-ion batteries. Physics of micro-combustion is quite different from that of large-scale combustion. In micro-combustion, there is an increased effect of flame-wall interaction and molecular diffusion. Also, surface-to-volume ratio increases drastically which entails more heat loss and thus causes the flame to quench easily. The principle on which the micro-power generators work is the conversion of chemical energy into the radiant energy. This is the foremost component to ponder over because this affects the overall efficiency of these devices.