استفاده از مدل احتراقی تولید‏فلیملت‏منیفولد در شبیه‏سازی گردابه‏های بزرگ آتش استخری و مقایسه با نتایج مدل احتراقی دیگر

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه تربیت مدرس

چکیده

از میان مطالعات تجربی و عددی که در زمینه‌ی آتش انجام‌شده است، آتش استخری بیش از سایر سناریوهای آتش، مورد استقبال قرارگرفته است. در این مقاله، به‌منظور بررسی تأثیر مدل‏ های احتراقی مختلف بر نتایج شبیه‏ سازی آتش، آتش استخری مطالعه می‏شود. به این منظور مدل احتراقی تولید فلیملت منیفولد به­ کار گرفته شده و نتایج آن با سه مدل احتراقی سینتیک بسیار سریع، اضمحلال گردابه و مفهوم اضمحلال گردابه مقایسه می ‏شود. با مقایسه‏ ی نتایج متوسط سرعت و نوسانات آن، مشاهده می‌شود که دقت مدل احتراقی تولید فلیملت منیفولد، بدون در نظر گرفتن اثر تشعشع، در پیش‌بینی پدیده‏ ی پوفینگ و فرکانس آن، متوسط مجذور نوسانات سرعت عمودی و انرژی جنبشی اغتشاشی بهتر از سایر مدل‌های احتراقی است. به‌عنوان‌مثال، نتایج مدل احتراقی تولید فلیملت منیفولد در پیش‏بینی فرکانس پوفینگ کمتر از ۳ درصد، خطای نسبی با نتایج تجربی دارد؛ اما سایر مدل‏ های احتراقی بیشتر از ۱۰ درصد خطا دارند. در پیش‌بینی میدان سرعت، مدل احتراقی اضمحلال گردابه، دقت بالاتری نسبت به مدل تولید فلیملت منیفولد دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Large Eddy Simulation of Pool Fire using FGM Combustion Model and Compared with Other Combustion Models

نویسندگان [English]

  • mohammad safarzadeh
  • ghassem Heidarinejad
  • Hadi Pasdarshahri
tarbiat modares university
چکیده [English]

Among the experimental and numerical studies conducted in the field of fire, the pool fire has been welcomed more than other fire scenarios. In this paper, pool fire is studied to investigate the effect of different combustion models on the fire simulation. For this purpose, the combination model of flamelet generated manifold (FGM) is used and its results are compared with three infinite fast chemistry (IFC), eddy dissipation (EDM) and eddy dissipation concept (EDC) combustion models. By comparing the mean velocity results and its fluctuations, it is observed that the accuracy of the FGM combination model, regardless of radiation effect, is better than other combustion models in predicting of the puffing phenomenon and its frequency, the mean square of vertical velocity, mean turbulence kinetic energy. For example, the FGM combustion model has less than 3% relative error with experimental results in prediction of the puffing frequency; but other combustion models are more than 10% relative error. In the prediction of the mean velocity field, the EDM combustion model has a higher accuracy than the FGM.

کلیدواژه‌ها [English]

  • Combustion model
  • Large eddy simulation
  • Flamelet generated manifold
  • Eddy dissipation
  • Infinite chemistry

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  • تاریخ دریافت: 19 اردیبهشت 1400
  • تاریخ بازنگری: 17 مرداد 1400
  • تاریخ پذیرش: 24 مرداد 1400

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