مکانیزم‌های حاکم بر گذار از شعله به تراک در مخلوط غیرهمگن هیدروژن-هوا: مطالعه‌ای بر تاثیر نسبت انسداد

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مکانیک- دانشکده مهندسی- دانشگاه بیرجند- بیرجند- ایران

2 هیات علمی دانشگاه آزاد اسلامی واحد نجف آباد

چکیده

هدف از این مقاله بررسی عددی تاثیر نسبت انسداد بر مکانیزم‌های حاکم بر فرایند گذار از شعله به تراک (DDT) در مخلوط غیرهمگن هیدروژن-هواست. محفظه مورد بررسی یک کانال مستطیلی بسته‌ مانع‌دار است که در سه نسبت انسداد 30،10 و 60 درصد و در فواصل موانع متفاوت مورد مطالعه قرار گرفته است. شبیه‌سازی عددی حاضر به­ کمک مدل اغتشاشی SST-K-ω و مدل احتراقی چین‌خوردگی سطح شعله ولر انجام گرفته و از روش HLLC برای تسخیر موج ضربه‌ای استفاده شده است. نتایج حاضر نشان می‌دهد که برای نسبت انسداد 10 درصد گذار به تراک در قسمت بدون مانع کانال و برای نسبت‌های انسداد 30 و 60 درصد در قسمت مانع‌دار کانال رخ داده است. با تغییر نسبت انسداد و فاصله موانع مکانیزم‌های حاکم بر فرایند DDT تغییر می‌کنند. انعکاس ماخ از دیواره پایینی کانال و شکل‌گیری ساقه‌ ماخ واکنشی، انعکاس ساقه‌ ماخ از دیواره موانع پایینی و انعکاس موج ضربه‌ای برخوردی از دیواره موانع بالایی از مهم‌ترین مکانیزم‌های حاکم مشاهده شده­اند. نتایج حاضر نشان داده‌اند که با افزایش نسبت انسداد، شتاب‌گیری شعله و وقوع DDT در کانال سریع‌تر اتفاق می‌افتد. سریع‌ترین حالت آغازش تراک در نسبت انسداد 60 درصد و نسبت فاصله به ارتفاع S/H=2.5 رخ داده است.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Mechanisms governing the deflagration to detonation transition in inhomogeneous mixtures of H2-air; A study on the effect of blockage ratio

نویسندگان [English]

  • Mohammad Hosein Shamsadin Saeid 1
  • Javad Khadem 1
  • SOBHAN EMAMI 2
1 Mechanical Eng, University of Birjand, Birjand, Iran
2 هیات علمی دانشگاه آزاد اسلامی واحد نجف آباد
چکیده [English]

This paper aims to numerically investigate the effect of blockage ratio on the mechanisms governing the deflagration to detonation transition (DDT) in inhomogeneous mixtures of H2-air. The study combustion chamber is a closed rectangular cross-section channel with obstacles that have been studied in three blockage ratios of 10, 30, and 60 percent and at different obstacle spacing. The present numerical simulation was performed using the SST-K-ω turbulence model and the combustion model of the Weller flame wrinkling and the HLLC method was used to shock-capturing. The results show that for the 10% blockage ratio, the onset of detonation occurred in the unobstructed part of the channel and for the blockage ratios of 30% and 60% DDT occurred in the obstructed section of the channel. The mechanisms governing the DDT process change as the blockage ratio and obstacle spacing change. The Mach reflection from the lower wall of the channel and the formation of the reactive Mach stem, the reflection of the Mach stem from the wall of the lower obstacles, and the reflection of incident shock from the wall of the upper obstacles are the most important governing mechanisms observed. The results also show that flame acceleration and the occurrence of DDT in the channel occur faster as the blockage ratio increases. The fastest onset of detonation occurred at the blockage ratio of 60% and the space to height ratio of S/H = 2.5.
 
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کلیدواژه‌ها [English]

  • Deflagration-to-detonation transition
  • Inhomogeneous mixture
  • Reactive Mach stem
  • blockage ratio
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