نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجو، رشته مهندسی مکانیک، دانشگاه شهید چمران اهواز، اهواز
2 استادیار، گروه حرارت و سیالات، دانشکده مهندسی مکانیک، دانشگاه شیراز، شیراز
3 دانشگاه شهید چمران اهواز، دانشکده مهندسی، گروه مهندسی نفت، گاز و پتروشیمی
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In the present study, combustion characteristics of premixed hydrogen-air mixture in converging - diverging microtubes were investigated using numerical simulation of combustion process. The purpose is investigation of the effect of inlet velocity and converging-diverging angle on the combustion characteristics consist of maximum flame temperature, flame position, upper flammability limit and flame thickness. Governing equations were considered as three dimensional and transient with detailed chemistry mechanisms. Results showed that inlet velocity affect flame position in the microtube and maximum flame temperature related on the flame position will change. Minimum flame temperature in a specific equivalence ratio were occurred when the flame placed in the converging-diverging section. Inlet velocity and throat section have a direct effect on the flame thickness. Increasing the flame thickness at high inlet velocities for microtubes with low throat diameter causes to blow out a part of the flame. Compared to a microtube with the same dimensions, it was found that making a throat zone in the microtubes causes to increase the upper flammability limit.
کلیدواژهها [English]