عنوان :
شبيه سازي عددي شعله هاي جزئي پيش مخلوط مغشوش
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
تبديل انرژي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
ده،152ص.:مصور،جدول،نمودار
يادداشت :
ص.ع.به: فارسي و انگليسي
استاد راهنما :
محسن دوازده امامي
استاد مشاور :
محمود اشرفي زاده
توصيفگر ها :
شعله هاي غير پيش مخلوط﴿ديفيوژن﴾ , نفوذ هوا , شعله بالارونده , مدل زيمنت , مدل فليملت ديفيوژن , مدل تعادلي
تاريخ نمايه سازي :
15/12/88
استاد داور :
عاي اكبر عالم رجبي،محمدرضا سليم پور
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Numerical Simulation of Turbulent Partially Preimed Flames Ali Tavasoly Ali tavassoly@me iut ac ir December 16 2009 Department College of Mechanical Engineering Isfaahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Mohsen Davazdah Emami mohsen@cc iut ac irAbstractIndustrial flames based on the type of mixing of fuel and oxidizer divide into two type premixed and non premixed diffusion In premixed flames fuel and air mix before combustion but in diffusion flames fuel andair mix in the surface of flame Premixed flames have more combustion efficiency and less pollutant butbecause of probability of explosion in more combustion equipment non premixed flames are in used For useof premium of both premixed and diffusion flames partially premixed flames can used in a way that someof air add to fuel before combustion primary air and next of air add in surface of flame secondary air Moreover in many industrial cases such as entrance of air in premixed flames lifted diffusion flames richand lean premixed flames local quenching of diffusion flames autoignition in nonhomogenous distribusionof fuel and oxidizer flames stabilized with swirl of hot gases spray combustion and etc partially premixedcombustion happen So use of a partially premixed model for simulation of this flames is necessary In thisthesis partially premixed models for simulation of industrial flames are used and effect of entrance of air andlift off height are investigated For simulation of partially premixed combustion merging of zimontcombustion model that is a premixed flamelet model based on the progress variable and flamelet orequilibrium combustion models based on the mixture fraction concept that are diffusion combustionmodels is used For simulation of effect of air entrance three Bunsen flames that are different in jetvelocity are modeled In second case for simulation of lift off height lifted non premixed jet flame models Perfect premixed solution for first case and perfect diffusion solution for second case are performed In allcases results are compared with previous experimental and numerical works On attention the results use ofpartially premixed models for above cases is necessary and perfect premixed and perfect diffusion models arenot able to simulate that effects Because of the stochiometric condition of simulated Bunsen flames equilibrium and flamelet models are in some difference but in the case of lifted flame difference betweenequilibrium and flamelet models is noticible The used partially premixed models in the case of Bunsen flamepresent good results even compare level set model that is an advanced model In the case lifted flame thatpartially premixed model does not simulate stability mechanism perfectly and so predict the lift off heightlower from experiment Key WordsPartially primed flames premixed flames non premixed diffusion flames entrance ofair lifted flame zimont model diffusion flamelet model equilibrium model
استاد راهنما :
محسن دوازده امامي
استاد مشاور :
محمود اشرفي زاده
استاد داور :
عاي اكبر عالم رجبي،محمدرضا سليم پور
