شبیه‌‌سازی نرخ تبخیر و دمای سوخت تحت اثر شار حرارتی متغیر با زمان در آتش استخری کم عمق

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس

2 دانشگاه تربیت مدرس، دانشکده مهندسی مکانیک، گروه تبدیل انرژی

3 دانشگاه تربیت مدرس

چکیده

ی
یکی از چالش‌ها و پیچیدگی‌های شبیه‌سازی مسائل مرتبط با آتش استخری با سوخت مایع، تعیین نرخ تبخیر سوخت است. در این پژوهش تلاش شده تا با استفاده از الگوریتم متشکل از روابط ساده تحلیلی و نیمه تجربی، نرخ تبخیر سوخت متانول در مسئله آتش استخری کم‌عمق تحت اثر شار تابشی و دمای محیط گذرا محاسبه شود. در این الگوریتم، هر دو پدیده انتقال حرارت و انتقال جرم لحاظ شد و رفتار هر پدیده مطالعه شد. در مقایسه نتایج شبیه‌سازی‌ها با نتایج عددی پژوهش‌های دیگر، دقت قابل قبولی (کمتر از 3 درصد خطای نسبی) مشاهده شد. همچنین، در مقایسه نتایج شبیه‌سازی با نتایج تجربی، مشخص شد نتایج پایای شبیه‌سازی به نسبت نتایج تجربی، 1 درصد خطای نسبی دارد. با بررسی نتایج، مشاهده شد که نرخ تبخیر در حالتی که شار تابشی گذراست، به نسبت حالتی که شار تابشی پایا است 50 ثانیه تأخیر زمانی دارد. همچنین، عدد ناسلت و عدد گراشوف مستقل از شار تابشی و وابسته به دمای محیط اطراف می‌باشند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical simulations of evaporation rate and fuel temperature under the transient radiative heat flux in the case of pool fire

نویسندگان [English]

  • Ghassem Heidarinejad 1
  • Farhad Jems 2
  • Mohammad Safarzadeh 3
1 Faculty of Mechanical Engineering, Tarbiat Modares University
2 Tarbiat Modares University, Faculty of Mechanical engineering. Energy Conversion Group
3 Tarbiat Modares University
چکیده [English]

 
Computing the evaporation rate of fuel is one of the challenges and complexities of pool fire simulations. In this study, the evaporation rate of methanol in a shallow pool fire problem is computed using an algorithm that includes analytical and empirical relations. Modeled radiative heat flux and surrounding air temperature are considered transient. Heat and mass transfer phenomena are included in this algorithm, and their effects are discussed. The relative error of results to other numerical studies was below 3 percent. Also, by comparing steady results to experimental results, the relative error was 1 percent. Results show that the evaporation rate in transient radiative heat flux case is delayed 50 seconds to constant radiative flux. In addition, Nusselt number and Grashof number are independent of radiative flux, and depend on surrounding air temperature.
 

کلیدواژه‌ها [English]

  • Evaporation rate
  • thin pool fire
  • Mass transfer
  • Numerical simulation

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سابقه مقاله

  • تاریخ دریافت: 04 تیر 1401
  • تاریخ بازنگری: 19 شهریور 1401
  • تاریخ پذیرش: 01 مهر 1401

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