IJE TRANSACTIONS C: Aspects Vol. 28, No. 3 (March 2015) 454-459   

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M. Bidabadi and M. J. Noroozi
( Received: October 16, 2014 – Accepted: December 18, 2014 )

Abstract    Flame stability inside a cylindrical micro-combustor was studied. Considering occurrence of heat recirculation, the respective relations were written and with parameters such as motion speed of reactants, flame propagation speed and thermal conductivity of the combustor’s wall, flame stability and its location inside micro-combustor were studied. It was found that for each thermal conductivity of the combustor’s wall, there is only one point inside the micro-combustor that if flame is formed in that point, it will be able to remain stable inside micro-combustor. It was also found that for each thermal conductivity of the combustor’s wall, flame inside the combustor remains stable only in one specified range of motion speed of reactants. In addition, blow-off limits were obtained for high and low speeds of reactants inside the combustor for different values of thermal conductivity of the combustor’s wall.


Keywords    Analytical model, Heat Recirculation, Wood Particles, Burning Velocity, Blow-Off Limits


چکیده    پایداری شعله، درون یک میکرو کامباستور استوانه ای مورد بررسی قرار گرفت. با در نظر گرفتن رخداد پدیده ی گردش حرارتی، روابط مربوطه نوشته شد و با استفاده پارامترهایی نظیر سرعت حرکت مواد واکنش دهنده، سرعت انتشار شعله و ضریب هدایت حرارتی جداره ی کامباستور، پایداری شعله و محل قرارگیری آن درون میکرو کامباستور مورد بررسی واقع شد. مشاهده گردید که به ازای هر ضریب هدایت حرارتی جداره ی مشخص، تنها یک نقطه درون میکروکامباستور وجود دارد که اگر شعله در آن نقطه تشکیل شود، قادر به پایدار ماندن درون میکرو کامباستور است. همچنین مشاهده شد که به ازای هر ضریب هدایت حرارتی جداره ی مشخص، تنها در یک محدوده ی مشخصی از سرعت حرکت مواد واکنش دهنده، شعله درون کامباستور پایدار می ماند. علاوه بر آن، به ازای مقادیر مختلف ضریب هدایت حرارتی جداره ی کامباستور، حدود خاموشی برای سرعت های بالا و پایین حرکت مواد واکنش دهنده درون کامباستور، به دست آمد.



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