| In recent years,a variety of micro electronic mechanical system has been widely used in aerospace,information communication,life science and other fields,bringing the research on its power system into sharp focus.The most significant of these is micro combustion.However,the micro combustion is unstable under restriction of decreased scale.In addition,it is necessary to study the micro-combustion characteristics of fuel under zero gravity for aerospace.And catalytic technology can stabilize micro combustion and improve fuel conversion even under zero gravity.Based on the project of the National Natural Science Foundation of China[51976054],this dissertation numerically reached the catalytic combustion characters of non–premixed hydrogen/air under zero gravity.The influences of inlet and structure parameters on combustor were obtained,while the reaction mechanism and heat transfer characteristics were explored.The main work and achievements are as shown below:(1)A simulation calculation model of hydrogen/air non-premixed catalytic combustion under zero gravity was established on account for Pt micro-combustor.The influence of the air oxygen and gravitation content on the catalytic combustion characteristics of hydrogen during the falling process under zero gravity was explored though numerical simulation.(2)The inlet and structural parameters of micro combustor were changed to numerically research the effect of inlet temperature,inlet flow rate,equivalent ratio,length and diameter of micro combustor on its catalytic combustion characteristics under zero gravity.The basic characteristics of hydrogen catalytic combustion were analyzed.(3)The catalytic combustion characteristics of the micro combustor under zero gravity were researched,while the influence of hydrogen and air inlet flow rates on its combustion characteristics was explored.The effect of the surface reaction on the space reaction and heat transfer characteristics were acquired. |
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