مقایسه‌ی مدل احتراقی فلیملت آرام و اضمحلال گردابه در شبیه‌سازی آتش در ساختمان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تربیت مدرس

2 تربیت مدرس * مهندسی مکانیک

چکیده

در مطالعه‌ی حاضر با استفاده از مدل‌های احتراقی فلیملت آرام پایا و اضمحلال گردابه، جریان آتش در فضای یک-اتاقی با استفاده از روش شبیه‌سازی گردابه‌های بزرگ مدل‌سازی شده است؛ تا مدل احتراقی سازگار با فیزیک جریان آتش در فضای یک‌-اتاقی مورد بررسی قرار گیرد. شبیه‌سازی با استفاده از مدل زیر شبکه اغتشاشی یک‌معادله‌ای انجام شد. برای استفاده از مدل فلیملت آرام پایا با استفاده از کتابخانه‌های نرم‌افزار اپن‌فوم حلگری در آن برای شبیه‌سازی جریان‌های احتراقی توسعه داده شد. سینتیک مورد استفاده برای مدل اضمحلال گردابه، سینتیک یک‌مرحله‌ای بازگشت‌ناپذیر است که فقط قادر به درنظرگرفتن گونه‌های اصلی احتراق است. هزینه محاسباتی شبیه‌سازی با استفاده از مدل اضمحلال گردابه، 14 درصد بیشتر از مدل فلیلمت بوده درحالی‌که سینتیک مورد استفاده در مدل فلیملت آرام پایا، سینتیک جی.آر.آی ۳ بوده که موجب پیش‌بینی گونه‌های میانی در احتراق خواهد شد. مقایسه‌ی نتایج دما و سرعت در بازشو برای دو مدل احتراقی نشان می‌دهد که مدل فلیملت آرام پایا با خطای نسبی 3/3 درصد برای دما و 8 درصد برای سرعت در بازشو، دقت بهتری در شبیه‌سازی جریان آتش در فضای تک-اتاقی، نسبت به مدل اضمحلال گردابه دارد. از طرفی مقایسه‌ی تغییرات دما در اتاق نشان می‌دهد که هر دو مدل پیش‌بینی خوبی از دما در اتاق ارائه می‌دهند اما مدل فلیملت آرام پایا با خطای نسبی 2/3 درصد دقت بهتری ارائه می‌کند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Comparison study of compartment fire simulation with steady laminar flamelet and eddy dissipation model

نویسندگان [English]

  • Seyed Mohammad Jamal Razeghi 1
  • mohamad safarzadeh 1
  • Hadi PasdarShahri 2
1 Tarbiat Modares University
2 Assistant Professor, Faculty of Mechanical Engineering, Tarbiat Modares University
چکیده [English]

The present study is conducted to find a compatible combustion model, in case of single room compartment fire. The large eddy simulation was used with one-equation sub-grid scale turbulence model by steady laminar flamelet and eddy dissipation models were acquired as the combustion model. OpenFOAM solver based on C++ programming language was developed to use the flamelet model. The benefit of the flamelet model employment than the eddy dissipation model was regarding the lower computational cost which was about 14 percent lower in this case. Moreover, steady laminar flamelet model considered the detailed chemical kinetic of GRI 3.0, however, eddy dissipation model treated the chemical kinetics of the model with an irreversible single-step Arrhenius global reaction which is only able to estimate the main products of combustion. Deviations of velocity and temperature at the doorway showed that the steady laminar flamelet model predictions were accurate with an uncertainty error of 3.3 % for temperature and 8 % for velocity, respectively. Prediction of the temperature inside the room with a steady laminar flamelet model was estimated to have 3.2 % accuracy.

کلیدواژه‌ها [English]

  • Compartment fire
  • Large Eddy Simulation
  • Eddy dissipation model
  • Steady laminar flamelet model
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