Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 29, No. 2 (February 2016) 246-254    Article Under Final Proof

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  LAMINAR FLAME SPEED PREDICTION IN LEAN MIXTURE OF ALUMINUM DUST CLOUDS BY CONSIDERING THE EFFECT OF RANDOM DISTRIBUTION OF PARTICLES IN TWO-DIMENSION
 
M. Bidabadi, B. Akhoondian and M. Harati
 
( Received: October 29, 2014 – Accepted: January 26, 2016 )
 
 

Abstract    In the present study, the effect of random distribution of reactants and products on laminar, 2D and steady-state flame propagation in aluminium particles has been investigated. The equations are solved only for lean mixture. The flame structure is assumed to consist of a preheat zone, a reaction zone and a post flame zone. It is presumed that in the preheat zone particles are heated and reaction does not exists. Then energy conservation equations of laminar flame had been solved two-dimensionally for different zones and algebraic equations of flame speed are obtained then a code was developed for modeling random situation of the combustion. Finally gas temperature distribution in different flame zones in the channel and also flame speed changes in terms of particles diameter, equivalence ratio, and channel width in random media are presented and compared with previous experimental and theoretical results. The gained results show a reasonable compatibility with the existed theories and experimental data

 

Keywords    Random distribution, Aluminium particles, Flame temperature, Burning velocity

 

چکیده   

در این تحقیق گسترش شعله آرام در محیط ذرات آلومینیوم با درنظر گرفتن تاثیر پخش ذرات بصورت تصادفی مورد بررسی قرار گرفته است.ساختار کلی شعله از سه محدوده پیش گرمایش، واکنش و پس از شعله تشکیل شده است. فرضیات مسئله بدین صورت است که در ناحیه پیش گرمایش واکنشی رخ نخواهد داد. معادله دوبعدی بقای انرژی برای هر یک از محدوده های شعله حل شده و نهایتا سرعت شعله بدست آمده است. برای مطالعه اثر تصادفی، تغییر پارامترهایی از قبیل قطر ذرات، نسبت اکووالانسی و عرض کانال انالیز و همچنین مشاهده نتایج توزیع دما و سرعت شعله و مقایسه آن با نتایج تجربی و تئوری های گذشته انجام پذیرفته است. مقایسه نتایج بیانگر این است که تصادفی کردن توزیع ذرات سبب بهتر شدن نتایج و نزدیک شدن به نتایج تجربی شده است

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