بررسی عددی تاثیر باد جانبی در حریق راه پله ساختمان بلند با نرم افزار پایروسیم

علوم کاربردی و محاسباتی در مکانیک

مقاله 2، دوره 36، شماره 4 - شماره پیاپی 38، دی 1403، صفحه 21-34   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jacsm.2024.81802.1178

نویسندگان

فاطمه بهبهانی^{* 1}؛ مهدی حمزه ای²؛ زهرا مهردوست²؛ محمد مقیمان³

¹گروه مهندسی مکانیک؛ واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

²گروه مهندسی مکانیک، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

³گروه مهندسی مکانیک، دانشگاه فردوسی، مشهد، ایران

چکیده

ساختمان‌های با ارتفاع زیاد معمولا در معرض وزش باد هستند. به جز اثر دودکشی، حرکت دود و رفتار حریق به شدت تحت تاثیر نیروهای باد خارجی می‌باشد. در این پژوهش تاثیر باد جانبی به صورت عددی با نرم‌افزار پایروسیم و به‌کارگیری معادلات ناویراستوکس، انرژی، بقا جرم، حریق و توزیع دود بررسی شد و برای آشفتگی از مدل شبیه‌سازی گردابه‌های بزرگ استفاده شده است. برای اعتبارسنجی نتایج با پژوهش ژاو و همکاران مقایسه گردید. سرعت باد جانبی بین 0 تا 2/1 متر بر ثانیه در نظر گرفته شد. تاثیر باد جانبی بر دمای دود در گرمای آزاد شده مختلف ارزیابی شد. گرمای آزاد شده در سه حالت 300، 500 و 900 کیلووات در نظر گرفته شد. در گرمای آزاد شده ثابت، دما در ابتدا افزایش می‌باید تا به یک پیک دمایی برسد سپس با افزایش سرعت باد میزان دما کاهش می‌یابد. هم چنین با افزایش سرعت باد میزان غلظت کربن مونوکسید حدود %3 بیشتر شد. نتایج نشان داد که باد جانبی، خطر حریق را افزایش می‌دهد و می‌بایست در طراحی ساختمان‌های در معرض باد مورد توجه قرار گیرد.

کلیدواژه‌ها

حرکت دود؛ رفتار حریق؛ باد جانبی؛ نرم‌افزار پایروسیم؛ دمای دود

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