Combustion characteristics and radiation performance of premixed hydrogen/air combustion in a mesoscale divergent porous media combustor |
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| Affiliation: | 1. Department of Mechanical and Materials Engineering, Military Institute of Engineering, Rio de Janeiro, 22290270, Brazil;2. Mechanical Engineering Department, Engineering Faculty, Trakya University, Edirne, 22030, Turkey;1. Energy Institute, Hangzhou Dianzi University, Hangzhou, 310018, PR China;2. FMP Technology GmbH, Am Weichselgarten 34, D-91058, Erlangen, Germany;1. University of Kashan, Kashan, Iran;2. Energy Research Institute, University of Kashan, Kashan, Iran;1. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Ministry of Education, Tianjin University, Tianjin 300072, PR China;2. Department of Energy and Power Engineering, School of Mechanical Engineering, Tianjin University, Tianjin 300072, PR China;3. Department of Power Engineering, Shenyang Institute of Engineering, Shenyang 110136, PR China |
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| Abstract: | To improve flammability and radiation efficiency, a divergent porous media combustor is proposed and numerically studied. The local thermal non-equilibrium model is used to consider the temperature difference between gas and solid matrix. Effects of equivalence ratio, the wall thermal conductivity, solid matrix thermal conductivity, and divergent ratio on combustion characteristics, radiation efficiency, and flammability limits are studied. The results show that the divergent channel extends the blowout limit by 186% and obtains a maximum radiation efficiency of 29.3%, increased by 70% compared with the straight channel. A smaller wall thermal conductivity is recommended considering the flammability range and radiation efficiency. A careful choice of solid matrix thermal conductivity and the divergent ratio is suggested to balance their opposing effects on the radiation efficiency and the flammability. |
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| Keywords: | Porous media combustion Micro-combustor Micro thermophotovoltaic system Flammability limit Excess enthalpy combustion Radiation efficiency |
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