Abstract
Flow structure and mixing properties by the baffle shape are numerically studied for a baffled micro combustor. The baffle shape is changed by various fuel and hole sizes. The numerical simulations based on different geometric conditions are performed by using the Reynolds Stress Model. The fuel-air mixing is greatly affected by flow recirculations. The centrally located flow recirculation has an important role for the entire mixing performance. The results show that this feature depends on the baffle configurations, and the baffle with small air holes represents efficient characters.
Highlights
In most combustion based micro power generation devices, the micro combustor is an important key factor to implement the energy converting from fuel contained chemical energy [1] [2]
The mixing mechanism properties coupled to the evolution of flow structure are needed to investigate previously before further discussion of the baffle shape effect
For a baffled micro combustor, recirculating flow and mixing characteristics depending on the baffle shape were investigated
Summary
In most combustion based micro power generation devices, the micro combustor is an important key factor to implement the energy converting from fuel contained chemical energy [1] [2]. For a micro combustor, the mixing of incoming fluids in a combustor is inherently weakened due to the flow laminarization and the combustion efficiency becomes worse. This feature is more obvious for a non-premixed combustor and results in a severe degradation for the whole system. A revised combustor for much higher fuel conversion efficiency is needed to solve such mixing problem. To achieve this aim, many efforts have been devoted in recent [3]-[11].
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