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Shi J.-R.,Shenyang Engineering College | Xu Y.-N.,Shenyang Engineering College | Xue Z.-J.,Shenyang Engineering College | Xie M.-Z.,Dalian University of Technology
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2010

A one-dimensional numerical simulation was performed of the combustion characteristics of a premixed gas in a dual-layer porous medium burner. The super-adiabatic combustion and stable flame zone in the burner under discussion were mainly studied. The research results show that the premixed gas can produce super-adiabatic combustion to a certain extent inside the dual-layer porous medium and the lean combustion limits can be extended to 0.45. The dual-layer porous medium can stabilize the flame at the interface within a relatively wide flow speed range. The minimum and maximum flame promulgation speeds obtained from a numerical prediction assume a same tendency as the test ones, which are at least three times higher than those in a free space. Source


Xu Y.-N.,Shenyang Engineering College | Shi J.-R.,Shenyang Engineering College | Xue Z.-J.,Shenyang Engineering College | Xie M.-Z.,Dalian University of Technology
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2010

By establishing a two-dimensional numerical model, studied were the porous medium combustion-combustion and heat transfer inside a heat exchanger and the influence of the system configuration on the thermal efficiency and the pressure drop of a combustion-heat exchanger. The research results show that the longitudinal distance of the heat exchange tubes has a remarkable influence on the temperature distribution, heat transfer speed and pressure loss inside the heat exchanger. To decrease the longitudinal distance of the heat exchange tubes can increase the thermal efficiency and pressure loss. The horizontal distance of the heat exchange tubes, however, has a very little influence on the thermal efficiency and pressure loss. In addition, to increase the diameters of small balls may result in an increase of the thermal efficiency and a sharp decrease of the pressure loss. The effectiveness of the numerical model can be verified through tests. Source

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