مهندسی شیمی ایران

مهندسی شیمی ایران

شبیه‌سازی دینامیک سیالات محاسباتی (CFD) تشکیل آلایندۀ ناکس در شعلۀ از قبل نامختلط و آشفتۀ بیودیزل

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار مهندسی شیمی و مواد، مجتمع آموزش عالی فنی و مهندسی اسفراین
2 استادیار مهندسی مکانیک و هوافضا، دانشگاه برونل لندن
3 استاد مهندسی گاز، دانشگاه صنعت نفت
4 استاد مهندسی شیمی، دانشگاه علم و صنعت ایران
چکیده
تشکیل اکسیدهای نیتروژن (ناکس) در شعلۀ آشفتۀ از قبل نامختلط بیودیزل از دیدگاه اولری- لاگرانژی در این مقاله بررسی شد. ابتدا احتراق به‌وسیلۀ دینامیک سیالات محاسباتی4 مدل شد. تخمین مشخصه‌های جریان سیال واکنش‌دهنده در شعلۀ آشفته، به‌وسیلۀ حل معادلات موازنۀ جرم، مومنتم، انرژی، تولید و انتقال ناکس است. از مدل ترتیب گسسته برای مدل تشعشع و افزایش دقت پیش‌بینی مدل در مشخص‌کردن دما و سطح اجزا استفاده شد. دمای احتراق و غلظت آلایندۀ منوکسید نیتروژن ارائه و با آزمایش‌ها مقایسه شد. مدل ارائه‌شده توانایی قابل قبول در محاسبۀ سطح آلایندۀ منوکسید نیتروژن از خود نشان داد. اختلاف میان سطح آلایندۀ ناکس در مدل و آزمایش‌ها ناشی از به‌کارگیری سازوکار احتراق ساده‌شده برای بیودیزل و نبود میسر القایی تشکیل منوکسید نیتروژن در آن سازوکار احتراق است. از مدل برای بررسی پراکندگی اکسیدهای نیتروژن در محیط احتراق استفاده شد. نتایج حاکی از تشکیل اکسیدهای نیتروژن در نواحی بعد از شکل‌گیری شعله است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

CFD Analysis of NOX Formation in Biodiesel Non-premixed Turbulent Flame

نویسندگان English

A. Jomekian 1
B. Bazooyar 2
A. Shariati 3
S. H. Hashemabadi 4
1 Assistant Professor of Chemical Engineering, Esfayaren University of Technology
2 Assistant Professor of Mechanics Engineering, Brunel University London
3 Professor of Gas Engineering, Petroleum University of Technology
4 Professor of Chemical Engineering, Iran University of Science and Technology
چکیده English

This paper presents a computational fluid dynamics (CFD) analysis of nitrogen monoxide (NO) and nitrogen dioxide (NO2) formation in a biodiesel turbulent non-premixed flame via Eulerian-Lagrangian concept. The model includes governing conservation equation of mass, momentum and energy, and equations representing the tabulation and transport of NOX (NO+NO2). Discrete Ordinates (DO) was exploited for modeling of heat radiation that increases the accuracy of the computational simulation in prediction of NO. The temperatures, and concentration of NOX are presented and compared with experimentation. The proposed model is able to accurately predict the formation of NOX under many circumstances. However, some discrepancies between the model and experimental data exist because of the surrogate combustion mechanism employed for biodiesel fuel and absence of prompt NO in the combustion mechanism employed in CFD codes.
 

کلیدواژه‌ها English

NOx Pollutants
Non-Premixed
Turbulent Flame
Biodiesel
CFD
Combustion
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