ارزیابی مدل‌های احتراقی در احتراق محیط متخلخل با نسبت هوای اضافی مختلف

نوع مقاله : مقاله پژوهشی

نویسندگان

1 فردوسی مشهد

2 مهندسی مکانیک دانشگاه فردوسی مشهد

چکیده

در این مقاله به بررسی همزمان اثرات نسبت هوای اضافی و مکانیزم‌های احتراقی بر روی دما و انتشار گونه‌ها در مشعل‌های محیط متخلخل با تغییر تخلخل پیوسته پرداخته شده است. برای این هدف از سینتیک‌های چند مرحله‌ای استفاده شده است و اثرات آ‌ن‌ها بر روی پروفیل دما، کسر جرمی گونه‌های اصلی و انتشار آلاینده‌ها برای مقادیر مختلف نسبت هوای اضافی مورد بررسی قرار گرفته است. معادلات حاکم بر مسألهشامل معادله پیوستگی، معادلات مومنتوم، معادلات انرژی فاز گاز و جامد و معادله بقاء گونه‌های شیمیایی با استفاده از روش حجم محدود حل شده و از الگوریتم سیمپل برای ارتباط بین سرعت و فشار استفاده شده است. نتایج نشان داد که به ازای نسبت هوای اضافی 5/1، نتایج ناشی از مکانیزم های احتراقی دارای دقت یکسان در پیش بینی پروفیل دما و کسر جرمی گونه‌های اصلی هستند و بعد از آن برای مقادیر بیشتر نسبت هوای اضافی نتایج ناشی از مکانیزم‌های احتراقی اختلاف کمی را نشان می‌دهد. این در حالی است که بیشترین اختلاف در نتایج برای حالت استوکیومتری مشاهده می‌شود. همچنیندر شرایط استوکیومتری میزان انتشار مونو اکسید نیتروژن با استفاده از مکانیزم احتراقی  مقدار صفر پیش بینی می‌شود و برای بقیه ضرایب نسبت هوای اضافی مقدار آن از مرتبه بزرگی  خواهد بود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of Combustion Models in a Porous Medium with Different Excess Air Ratios

نویسندگان [English]

  • Hossein Ajam 1
  • iman mohammadi 2
2 mechanical engineering ferdowsi university of mashhad
چکیده [English]

 In this paper, the simultaneous study of the effects of the excess air ratio and the combustion mechanisms on the temperature and distribution of species in the porous medium burners with continuous porosity variation has been investigated. For this purpose, multi-step chemical kinetics have been used and their effects on the temperature profile, mass fraction of the main species and emission of pollutants for different values of the excess air ratio have been investigated. Problem-solving equations include continuity equation, momentum equations, gas, and solid phase energy equations, and the chemical equilibrium equation is solved using the finite volume method and the semi-implicit method for pressure linked equations algorithm is used for the relationship between velocity and pressure. The results showed that for excess air ratio of 1.5, the results of combustion mechanisms have the same accuracy in predicting the temperature profile and mass fraction of the main species, and then, for additional values of the excess air ratio, the results of the combustion mechanisms Show a slight difference. This is while the greatest difference in the results is observed for the stoichiometric condition. Also in stoichiometric conditions, the NO emission rate using the GRI-3.0 combustion mechanism is predicted to be zero, and for the rest of the coefficients of the excess air ratio, its value will be of the order of magnitude 10-6.

کلیدواژه‌ها [English]

  • porous media burner
  • Chemical Kinetic
  • porosity variation
  • Axisymmetric Combustion
  • excess air ratio
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