بررسی دمای دیوار بر مکش دودکش وسایل گازسوز با استفاده از جریان دوفازی

نوع مقاله : مقاله علمی

نویسندگان
ایوب خسروی فارسانی 1
ایمان پیشکار دهکردی 2
علیرضا نگهبان 3
1 مربی، گروه مهندسی مکانیک، دانشگاه ملی مهارت، تهران، ایران
2 استادیار، گروه مهندسی مکانیک، دانشگاه پیام نور، تهران، ایران
3 کارشناس، سازمان نظام مهندسی استان چهارمحال و بختیاری، شهرکرد، ایران
10.22034/stme.2025.536865.1152
چکیده
در این پژوهش بررسی عددی تأثیر تغییر دمای دیواره در مکش دودکش بخاری گازسوز ساختمان‌های مسکونی‌ به‌وسیله جریان دوفازی در نرم‌افزار انسیس فلوئنت مورد بررسی قرار گرفت. برای حل عددی معادلات پیوستگی، مومنتوم و انرژی از روش حجم محدود استفاده‌شده و تحلیل انجام‌شده با کارهای قبلی راستی آزمایی شده است. با توجه به استفاده زیاد دودکش در ساختمان‌های مسکونی و اهمیت مکش مناسب دودکش در مصرف بهینه وسایل گازسوز و همچنین خروج محصولات احتراق، دمای دیواره و عایق دودکش دارای توجه ویژه است. نتایج پس از حصول اطمینان از استقلال حل از شبکه، مشخص می‌کند که سرعت خروجی محصولات احتراق از دودکش با افزایش دمای دیواره بیشتر می­شود. با کاهش دمای دیواره نیروی شناوری که به دلیل اختلاف چگالی ناشی از اختلاف دما است کاهش می‌یابد و هم‌زمان تغییر فاز از گاز به مایع بیشتر می­شود که این عوامل باعث کاهش سرعت جریان در دودکش می­شوند و در نتیجه مکش دودکش کاهش می­یابد. همچنین با کاهش دمای دیواره از 360 به 330 کلوین اختلاف فشار ورودی نسبت به خروجی 23 درصد کم می‌شود که این عامل نشان‌دهنده کاهش قدرت دودکش است.
کلیدواژه‌ها
دودکش
بخاری گازسوز
دمای دیواره
جریان دوفازی
ساختمان مسکونی
موضوعات

عنوان مقاله English

Investigating the wall temperature on the chimney suction of gas-burning appliances using two-phase flow

نویسندگان English

Ayoob Khosravi Farsani 1
Eiman Pishkar 2
Alireza Negahban 3
1 1. Instructor, Department of Mechanical Engineering, Technical and Vocational Univercity (TVU), Tehran, Iran
2 2. Assistant professor, Department of Mechanical Engineering, Payame Noor, Tehran, Iran
3 B.Sc, Department of Mechanical Engineering, Payame Noor, Tehran, Iran
چکیده English

In this study, the numerical study of the effect of wall temperature change on the suction of gas-fired boiler chimneys in residential buildings was investigated using two-phase flow in ANSYS Fluent software. The finite volume method was used to numerically solve the continuity, momentum, and energy equations, and the analysis was verified with previous works. Considering the high use of chimneys in residential buildings and the importance of proper chimney suction in the optimal use of gas-fired appliances and the exit of combustion products, the temperature of the wall and chimney insulation are of special interest. After ensuring the independence of the solution from the network, the results indicate that the speed of the combustion products exiting the chimney increases with increasing wall temperature. With a decrease in wall temperature, the buoyancy force due to the difference in density caused by the temperature difference decreases, and at the same time, the phase change from gas to liquid increases, which causes a decrease in the flow speed in the chimney, and as a result, the chimney suction decreases. Also, by reducing the wall temperature from 360 to 330 Kelvin, the difference in inlet pressure compared to outlet decreases by 23 percent, which indicates a decrease in chimney power.

کلیدواژه‌ها English

Chimney
Gas Heater
Wall Temperature
Two-phase Flow
Residential Building
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