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شبیهسازی عددی آتش در اتاق با مدل احتراقی تولید فلیملت منیفولد و مقایسه با مدلهای احتراقی دیگر | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 1، دوره 54، شماره 3، خرداد 1401، صفحه 493-508 اصل مقاله (2.66 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2021.19947.7145 | ||
| نویسندگان | ||
| محمد صفرزاده؛ قاسم حیدری نژاد؛ هادی پاسدار شهری* | ||
| دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران. | ||
| چکیده | ||
| در این مقاله، از روش شبیهسازی گردابههای بزرگ استفاده شد و روش تک-معادلهای به عنوان روش زیر شبکه اتخاذ گردید. همچنین شبیهسازیها به صورت سهبعدی، غیر دائم و تک فاز انجام می‌شود و عدد فرود 0/۰۰۰۲۵۵ در نظر گرفته می‌شود. به‌منظور بررسی دقیق اثر مدل احتراقی، مدل احتراقی تولید فلیملت منیفولد در شبیهسازی آتش در اتاق استفاده می‌شود و نتایج این مدل احتراقی با مدلهای سینتیک بسیار سریع و اضمحلال گردابه مقایسه می‌شود. با مقایسهی نتایج مشاهده می‌شود که در سناریوی آتش در فضای اتاق با نرخ آزادسازی حرارت 62/9 کیلووات، دمای متوسط در شعله به‌طور تقریبی ۱۵۰۰ کلوین می‌شود. همچنین، نتایج مدل احتراقی اضمحلال گردابه و سینتیک بسیار سریع بهتر از مدل احتراقی تولید فلیملت منیفولد نتایج دما را پیشبینی کردهاند؛ اما در پیشبینی سرعت هر سه مدل احتراقی با خطای نسبی کمتر از ۱۰ درصد، به نتایج تجربی نزدیک هستند. با توجه به هزینهی محاسباتی پایین مدل تولید فلیملت منیفولد و توانایی استفاده از سینتیک کامل در این مدل احتراقی و همچنین دقت قابل قبول آن، استفاده از این مدل در شبیهسازی آتش در اتاق، مناسب است. | ||
| کلیدواژه‌ها | ||
| آتش در ساختمان؛ شبیهسازی گردابههای بزرگ؛ مدل احتراقی؛ تولید فلیملت منیفولد | ||
| عنوان مقاله [English] | ||
| Numerical Simulation of Compartment Fire with Flamelet Generated Manifold and Comparison with Other Combustion Models | ||
| نویسندگان [English] | ||
| mohamad safarzadeh؛ Ghassem Heidarinejad؛ Hadi PasdarShahri | ||
| tarbiat modares university | ||
| چکیده [English] | ||
| In this paper, the large eddy simulation was used and the one-equation method was adopted as the sub-grid method. In addition, the simulations are performed in three-dimensional, unsteady, and single-phase case and the Froude number is considered 0.000255. To investigate the effect of the combustion model, the combustion model of flamelet generated manifold is used in the simulation of fire in the room and the results of this combustion model are compared with infinite fast chemistry models and eddy dissipation models. Comparing the results, it can be seen that in the fire scenario in the room with a heat release rate of 62.9 kW, the mean temperature in the flame is approximately 1500 Kelvin. Also, the results of the eddy dissipation combustion model and infinite fast chemistry predict the temperature results better than the flamelet generated manifold combustion model; but, all three combustion models are close to experimental results with a relative error of less than 10%, in predicting the velocity. Due to the low computational cost of the flamelet generated manifold model and the ability to use detailed kinetics in this combustion model, as well as its acceptable accuracy, it is appropriate to use this model in the compartment fire simulation. | ||
| کلیدواژه‌ها [English] | ||
| Compartment fire, Large eddy simulation, Combustion model, Flamelet generated manifold | ||
| مراجع | ||
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