بررسی عددی اثرات زاویه واگرایی ، طول ناحیه پیش‌گرمایش، بر روی احتراق و ایجاد آلاینده‌ها در مشعل محیط متخلخل

نوع مقاله : مقاله پژوهشی

نویسندگان

مهندسی مکانیک دانشگاه فردوسی مشهد

10.22034/jfnc.2019.92711

چکیده

در این مقاله نتایج حاصل از مدل‌سازی دوبعدی و متقارن محور احتراق پیش‌آمیخته متان-هوا با سینتیک چندمرحله‌ای در داخل محیط متخلخل با تغییر تخلخل پیوسته ارائه‌ شده است که در آن برای مشخص کردن خصوصیات ترمو‌فیزیکی و ترموشیمیایی از برنامه کمکین2 و اطلاعات پایه آن استفاده شده است. معادلات پیوستگی، ناویر استوکس، معادلات انتقال حرارت فاز گاز و جامد و معادلات حاکم بر گونه‌های شیمیایی با استفاده از روش حجم محدود حل شده و برای ارتباط بین سرعت و فشار از الگوریتم سیمپل استفاده شده است. مشعل مورد مطالعه شامل دو ناحیه پیش‌گرم و احتراقی است. در این‌کار به بررسی اثرات تغییر زاویه واگرایی و طول ناحیه پیش‌گرمایش مشعل بر روی پروفیل دما و انتشار آلاینده‌ها می‌پردازیم. نتایج نشان داد که با افزایش زاویه واگرایی میزان آلاینده NO در خروجی مشعل به شکل چشمگیری افزایش می‌یابد درحالی‌که با افزایش طول ناحیه پیش‌گرمایش مقدار انتشار این آلاینده در خروجی کاهش می‌یابد.

کلیدواژه‌ها

عنوان مقاله [English]

Numerical investigation of the effects of divergence angle, pre-heating zone length on the combustion and emission of pollutant in the porous media burner

نویسندگان [English]

  • iman mohammadi
  • hossein ajam
mechanical engineering ferdowsi university
چکیده [English]

In this paper, the results of the two-dimensional and axisymmetric modeling of the methane-air pre-mixed combustion with multi-step kinetics in a porous medium with continuous porosity change have been presented. In order to determine the thermophysical and thermochemical properties of species, the CHEMKIN II program and Basic information used. Continuity equations, Navier Stokes, gas and solid phase heat transfer equations, and chemical species governing equations are solved by using of finite volume method. The SIMPLE algorithm has been used for the relationship between speed and pressure. The burner under the studied includes two preheated and combustible areas. In this paper, we study the effects of divergence angle changes and length of burner preheating area on temperature profiles and emission of pollutants. The results showed that by increasing the divergence angle, the amount of NO contamination in the burner output increases dramatically, while by increasing the length of the preheating region, the amount of emission of this pollutant in the output decreases.
 

کلیدواژه‌ها [English]

  • porosity variation
  • axisymmetric combustion
  • finite volume method
  • chemical kinetics
  • divergence angle

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سابقه مقاله

  • تاریخ دریافت: 27 شهریور 1397
  • تاریخ بازنگری: 18 آذر 1397
  • تاریخ پذیرش: 23 آذر 1398

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