بهبود مشخصه‌های احتراقی مخلوط هیدروژن – هوا با استفاده از ساختار ماژولار در محفظه های احتراقی در مقیاس میکرو

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، دانشکده مهندسی مکانیک، دانشگاه شیراز

2 استاد، دانشگده مهندسی مکانیک، دانشگاه صنعتی شریف

چکیده

د
در کار حاضر، تاثیر استفاده از ساختار ترکیبی بر مشخصه‌های احتراقی مخلوط هیدروژن-هوا، با استفاده از شبیه‌سازی عددی سه­ بعدی و درنظر گرفتن سینتیک شیمیایی جزئی و ضرایب نفوذ مولکولی، بررسی می ­شود. تاثیر پارامترهای سرعت جریان ورودی، رسانش حرارتی دیوار و انحنای دیوار بر روی مشخصه­های احتراق هیدروژن-هوا برای دو ساختار ساده و ترکیبی بررسی شد. نتایج نشان می­دهد که استفاده از ساختار ترکیبی تاثیر بسزایی بر روی  مشخصه­ های احتراقی و مکان شعله می­گذارد. در ساختار ترکیبی، نقش انتقال حرارت، به­واسطه سیال ثانویه، در مقایسه با ساختار ساده افزایش می­یابد که منجربه بهبود مشخصه­های حرارتی محفظه احتراق و کاهش نقش رسانش حرارتی دیوار در ساختار ترکیبی می­ شود. استفاده از آرایش ترکیبی در مقایسه با ساختار ساده باعث می­شود که در سرعت ورودی یکسان، شعله به­صورت مشخصی در فاصله نزدیک­تر از ورودی محفظه احتراق تشکیل شود. تاثیر نسبت انحنای لوله به شعاع لوله با درنظرگرفتن دو مقدار 1 و 2 بررسی و مشاهده شد که در نسبت انحنای کمتر، به­علت نقش پیش ­گرم­ کردن جریان ورودی توسط محصولات، مکان جبهه شعله به ورودی نزدیک­تر و توزیع دما درون محفظه احتراق بهتر خواهد بود.

کلیدواژه‌ها

عنوان مقاله [English]

Improvement of combustion characteristics for hydrogen-air mixture using modular structure in a novel micro combustor

نویسندگان [English]

  • Alireza Alipoor 1
  • Mohammad Hassan Saidi 2
1 Mechanical Engineering School, Shiraz University
2 Sharif University of Technology
چکیده [English]

In the present work, the effect of using modular structure on combustion characteristics of the premixed lean hydrogen-air mixture is investigated by utilizing the three-dimensional CFD model, detailed chemistry and transport taking into account heat transfer through the wall combustor. Combustion characteristics are studied for different parameters, namely inlet velocity, wall thermal conductivity and tube curvature for modular structure and it compares with results of simple structure. The results show that using modular structure can significantly move flame front toward inlet section. In modular structure, the role of heat transfer due to secondary fluid increases in comparison with heat transfer in combustor walls. It improves thermal stability in the micro combustor and therefore, the role of wall thermal conductivity and heat transfer in wall combustor will be decreased for modular structure. Using modular structure for lower tube curvature is more effective which it has been shown for tube curvature of one and two.

کلیدواژه‌ها [English]

  • Combustion in Micro Scale
  • Modular structure
  • U-shaped micro combustor
  • Numerical simulation

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سابقه مقاله

  • تاریخ دریافت: 04 مهر 1397
  • تاریخ بازنگری: 10 آبان 1397
  • تاریخ پذیرش: 22 آبان 1397

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