بررسی آزمایشگاهی پدیده خاموشی شعله مخلوط متان و هوا با حضور صفحات سوراخ دار و موانع متخلخل در یک محفظه بسته

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری دانشگاه صنعتی شاهرود

2 دانشیار دانشگاه صنعتی شاهرود

3 دانشگاه صنعتی شاهرود، استاد

10.22034/jfnc.2021.262501.1255

چکیده

مطالعه و بررسی الگوی احتراق در زمان برخورد شعله با موانع برای افزایش ایمنی در صنایع مختلف از اهمیت زیادی برخوردار است. در این مقاله، به بررسی تجربی رفتار خاموشی شعله با حضور موانع متخلخل و صفحات سوراخ­دار پرداخته شده است. از یک محفظه بسته با حضور موانع متخلخ و صفحات سوراخ­دار 2 میلی­ متری و از یک دوربین فیلم­برداری با سرعت بالا برای تصویربرداری از رفتار انتشار شعله استفاده شده است. تمامی آزمایش­ ها در فشار اتمسفر انجام شده است. مطابق تصاویر ثبت ­شده، شعله پس از برخورد به موانع با دو الگوی دیوارجانبی (Side wall) و نوک­به­ نوک (head on) خاموش می ­شود. در این مطالعه، اثر موقعیت موانع از سیستم جرقه بر فاصله خاموشی شعله، الگوی خاموشی شعله و سرعت انتشار شعله مورد بررسی و آشکارسازی قرار گرفته است. موقعیت موانع متخلخل و صفحات سوراخ­دار  2 میلی­ متری در فاصله خاموشی شعله تأثیرگذار است. هنگامی که صفحه سوراخ ­دار در فاصله مشخصی از سیستم جرقه قرار دارد، شعله پس از انتشار و  برخورد به صفحه خاموش می­شود و در حالتی که مانع متخلخل در همین فاصله از سیستم جرقه قرار داده می­شود، شعله پس از برخورد به مانع متخلخل، از مانع عبور می­کند. طبق نتایج به ­دست ­آمده و عکس ­برداری­ های انجام­ شده، حضور موانع متخلخل در یک محفظه بسته نسبت به صفحات سوراخ­دار باعث افزایش فاصله خاموشی و سرعت نوک شعله می ­شود. با حضور موانع متخلخل نسبت به صفحات سوراخ ­دار فاصله خاموشی شعله از 16/6 سانتی­متر به 25 سانتی ­متر افزایش می ­یابد. همچنین، سرعت نوک شعله در محفظه با استفاده از موانع متخلخل با افزایش حدود 128 درصد از 2/5 به 5/7 متر بر ثانیه رسیده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental study of flame quenching phenomenon of mixed methane and air in the presence of perforated plates and porous barriers in a closed chamber

نویسندگان [English]

  • Hadi Younesian 1
  • M M Shahmardan 3
1 Shahrood univ. of tech.
3 Shahrood Univ. of Tech.
چکیده [English]

Experimental study of flame quenching phenomenon of mixed methane and air in the presence of perforated plates and porous barriers in a closed chamber
 
Hadi Younesian1, Mohsen Nazari*2 and Mohammad Mohsen Shahmardan 3
1- Department of Mechanical Engineering, Energy Conversion, Shahrood University of Technology, Iran, H_younesian@yahoo.com
2- Department of Mechanical Engineering, Energy Conversion, Associate Professor Shahrood University of Technology, Iran, mnazari@shahroodut.ac.ir
3- Department of Mechanical Engineering, Energy Conversion, Professor Shahrood University of Technology, Iran, mmshahmardan@shahroodut.ac.ir
* Corresponding author
(Received: 2020.12.18, Received in revised form: 2021.04.30, Accepted: 2021.05.17)
 
Investigation the combustion pattern when the flame hits with obstacles is very important to increase safety in various industries. In this paper, the flame quenching behavior with the presence of porous barriers and perforated plates is investigated. In this study, a closed chamber with the presence of porous barriers and 2 mm perforated plates and a high-speed video camera were used to capture the flame propagation behavior process. All experiments were performed at atmospheric pressure. According to the recorded images, the flame quenches in two modes; side wall and head on, after hitting the obstacles. In this study, the effects of the position of obstacles from the ignition system on the flame quenching distance, flame quenching pattern, and flame propagation speed have been investigated. The position of the porous barriers and 2 mm perforated plates is effective in the flame quenching distance. When the perforated plate is 16.6 cm away from the ignition system, the flame quenches after hitting the first obstacle. However, when the porous barrier is located at a distance of 16.6 cm from the ignition system, the flame passes through the barrier after hitting the barrier. According to the results, the presence of porous barriers in a closed chamber compared to perforated plates increases the quenching distance and the speed of the flame tip. For example, with the presence of porous barriers relative to perforated plates, the flame quenching distance increases from 16.6 cm to 25 cm. Also, the flame tip speed has increased by about 128% from 2.5 to 5.7 m/s using porous obstacles.
 
 
me extinction distance increases from 16.6 cm to 25 cm.

کلیدواژه‌ها [English]

  • Keywords: Flame quenching
  • quenching pattern
  • perforated plates
  • porous barriers
  • quenching distance
  • methane and air mixture
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