پديد آورنده :
چيتگرها، فاطمه
عنوان :
مدل سازي و شبيه سازي رفتار شعله با استفاده از مدل هاي احتراقي فليملت پايا و گذرا
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
تبديل انرژي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
پانزده،118ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
محسن دوازده امامي
توصيفگر ها :
احتراق مغشوش , شعله غير پيش مخلوط , بانك اطلاعاتي فليملت
تاريخ نمايه سازي :
28/2/92
استاد داور :
احمد صابونچي، محمود اشرفي زاده
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Modeling and Simulation of Flame Behavior Using Unsteady and Steady Flamelet Combustion Models Fatemeh Chitgarha th f chitgarha@me iut ac irJanuary 21 2013 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiMohsen Davazdah Emami mohsen@cc iut ac ir Abstract Reduction of environmental pollutants caused by combustion in power plant systems is one of the main challenges for the researchers To pinpoint the mechanisms of formation and transport of combustion pollutants it is necessary to have an accurate prediction of temperature field of the combustion products For this reason simulation of turbulent combustion flows has attracted much attention in recent years An appropriate combustion model is required for simulation of these flows Flamelet model is the most favorite combustion model due to inherent separation of the turbulent flow field and the chemical reactions Moreover the consideration of unsteady flamelet in modeling complex physical phenomena such as radiation heat transfer and slow chemical processes of pollutants leads to better results than the steady flamelet assumption The purpose of this study is to investigate the application of steady and unsteady flamelet models in the simulation of turbulent diffusion bluff body and jet flames In order to achieve this task first a database of temperature and chemical species mass fraction is created in steady state This flamelet library is obtained from the solutions of simple opposed jet diffusion flames by assuming unity and non unity Lewis number in the space of mixture fraction The FlameMaster code is used to build these libraries Effect of turbulence on the combustion field of flamelets is applied by considering a presumed pdf beta function which depends only on the mean mixture fraction and its variance Another input to the library is the mean value of the scalar dissipation rate By performing the integration of the chemical library over the permissible range of the quantities the mean values of chemical species mass fraction and temperature is achieved The transient effects are considered in a post processing manner using the unsteady flamelet Model In this model the transient history of scalar dissipation rate conditioned at stoichiometric mixture fraction is required This value is obtained by considering a tracer particle to generate unsteady flamelets In addition the probability of finding unsteady flamelet is obtained by solving an unsteady scalar transport equation on a converged solution in the whole domain Predictions of velocity mean mixture fraction and its rms using the modified k 9 have shown very good agreement with experiment data Comparisons of the results of steady and unsteady calculations have shown that transient
استاد راهنما :
محسن دوازده امامي
استاد داور :
احمد صابونچي، محمود اشرفي زاده
