مجله مهندسی مکانیک

مجله مهندسی مکانیک

مطالعه‌ تأثیر رقیق ‌سازی سوخت در شعله ‌های نفوذی متان/هوا بر میزان انتشار آلاینده ‌های زیست محیطی

نوع مقاله : علمی پژوهشی

نویسندگان
1 استادیار، گروه مهندسی مکانیک، دانشکده مهندسی، دانشگاه بزرگمهر قائنات، قائن
2 استادیار، گروه مهندسی مکانیک، دانشکده مکانیک و عمران، دانشگاه صنعتی اسفراین، اسفراین
چکیده
هرگاه احتراق غیر پیش آمیخته، حاصل دو جریان مختلف ‌الجهت سوخت و اکسیدکننده باشد به آن شعله‌ جریان مخالف نفوذی گفته می ‌شود. هدف اصلی در پژوهش حاضر، بررسی اثر گاز آرگون به عنوان رقیق کننده بر شعله جریان مخالف نفوذی متان و میزان انتشار آلاینده ‌هایی مانند NOx، CO و دوده است. شبیه سازی عددی به کمک نرم افزار شبیه ساز احتراق کمکین انجام گردید. جمله‌ نفوذ به کمک روش تفاضل مرکزی با خطای مرتبه­ دو منفصل گردید. برای ایجاد همگرایی بیشتر در انفصال جمله جابجایی از روش بالا دست که قادر به تشخیص جهت جریان است، استفاده شد. معادلات منفصل شده به کمک حلگر دو نقطه‌ ای با انتگرال ‌گیری زمانی حل گردید. نتایج نشان می ‌دهند که افزایش میزان رقیق کننده منجر به کاهش ماکزیمم دما و کسر مولی رادیکال‌ های فعال از جمله رادیکال H می ‌شود. کاهش رادیکال فعال H باعث می ‌شود که سوخت، کمتر تحت تأثیر این گونه قرار گرفته و بنابراین نفوذ بیشتری در سمت اکسید کننده داشته باشد. انتشار گونه های NO، NO2، C2H2 و CO که جزء آلاینده ‌های زیست محیطی می ‌باشند و برای سلامتی مضر هستند، با افزایش درصد رقیق کننده به طور میانگین تا 25/32 % کاهش می یابند که این موضوع از دیدگاه کنترل آلودگی هوا و موضوعات مربوط به راندمان احتراق دارای اهمیت فراوانی است. 
کلیدواژه‌ها

موضوعات


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دوره 33، شماره 6 - شماره پیاپی 159
بهمن و اسفند 1403
صفحه 25-34

  • تاریخ دریافت 08 فروردین 1403
  • تاریخ بازنگری 08 مرداد 1403
  • تاریخ پذیرش 16 مرداد 1403