شبیه سازی احتراق مدفون در محیط متخلخل به روش FGM

َعطوف, حسین; دوازده امامی, محسن

شبیه سازی احتراق مدفون در محیط متخلخل به روش FGM

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه صنعتی اصفهان

چکیده

در این پژوهش روشی به نام تولید فلیملت از منیفولد ‎(FGM)‎ معرفی شده است که ترکیبی از دو روش کاهش سینتیک، یعنی روش فلیملت و روش منیفولد است. در این روش شعله چند بعدی بصورت مجموعه ای از شعله های یک بعدی در نظر گرفته شده است (روش فلیملت) و ساختار شعله توسط تعداد محدودی متغیر کنترلی تعیین می‌گردد (روش منیفولد). متغیرهای ترموشیمیایی در یک بانک داده ذخیره شده و در شبیه سازی شعله استفاده می‌شوند. در طول شبیه سازی معادله متغیرهای پیشرو نیز حل می‌شود. در این مطالعه بمنظور دقت سنجی این روش، از یک مشعل یک بعدی شعله پایدار استفاده شده و نتایج حاصل دو شبیه سازی جریان واکنشی با روش های سینتیک جزئی و روش حاضر مقایسه شده است. در مرحله بعد روش FGM برای شبیه سازی شعله مدفون در محیط متخلخل بکار گرفته شده و نتایج بدست آمده از شبیه سازی که شامل نمودارهای دمای دو فاز گاز و جامد است، با نتایج آزمایشگاهی مقایسه شده است. این تحقیق نشان می دهد که استفاده از روش FGM در مقایسه با روش سینتیک جزئی تا چه اندازه دارای دقت بوده و زمان انجام شبیه سازی احتراق را تا چندین برابر می تواند کاهش می‌دهد.

کلیدواژه‌ها

موضوعات

شبیه سازی جریان های واکنشگر

عنوان مقاله [English]

Submerged Flame in Porous Media: A Numerical Study by Using FGM

نویسندگان [English]

Hossein Atoof
Mohsen Davazdah Emami

Isfahan University of Technology

چکیده [English]

In this study a new method for computation of reacting flow in porous media is presented, which can be considered as a combination of two existing reduced chemistry approaches i.e. the flamelet and manifold approach, to speed up flame calculations. This method, referred to as the Flamelet-Generated Manifold‎ (FGM) method, shares the idea with the flamelet approaches that a multi-dimensional flame may be considered as a set of one-dimensional flames. The thermo-chemical variables are stored in a database, which can be used in subsequent flame simulations. During flame simulation, conservation equations have to be solved for the controlling variables only. Test results of a two-dimensional methane/air flame shows that detailed chemistry computations are reproduced very well by using FGM with only one progress variable, apart from the enthalpy to account for energy losses. Using the FGM method, the computation time has been reduced several times in simulating flames, demonstrating the enormous potential of the method. Submerged flames within a porous medium simulated to show the applicability of presented method in predicting reacting flow in variable enthalpy problems. The predicted solid and gas temperatures are comparable to experiment, demonstrating the ability of the FGM method.

کلیدواژه‌ها [English]

Porous media
premixed combustion
FGM method

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