بررسی عددی سه‌بعدی عملکرد پیل سوختی اکسید جامد با میدان جریان همگرا واگرا

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مهندسی مکانیک، دانشکده فنی، دانشگاه آزاد اسلامی، لاهیجان، ایران، لاهیجان، ایران

2 مکانیک، دانشکده مکانیک، دانشگاه آزاد لاهیجان، ایران، لاهیجان

3 مهندسی مکانیک، دانشکده فنی، دانشگاه آزاد لاهیجان، ایران، لاهیجان

چکیده

نقش مهم صفحات دو‌قطبی در پیل سوختی اکسید جامد، توزیع یکنواخت واکنش دهنده‌ها به مکان‌های انجام واکنش، جمع آوری جریان و جداسازی هر سلول از سلول دیگر است. بنابراین عملکرد یک پیل سوختی اکسید جامد به‌شدت وابسته به کانال‌های عبور جریان هوا و سوخت می‌باشد. در راستای بررسی چگونگی تأثیر هندسه کانال‌های جریان هوا و سوخت روی عملکرد، چگالی جریان و توان، نتایج شبیه‌سازی برای ارزیابی عملکرد دو نوع پیل سوختی با کانال‌های مستقیم و کانال‌های همگرا واگرا بحث شده‌اند. در این تحقیق یک مدل سه‌بعدی از پیل سوختی اکسید جامد صفحه‌ای حمایت شده توسط آند با سوخت هیدروکربنی ارائه شده‌است. نتایج نشان می‌دهد که اختلاف فشار بین کانال‌های همگرا واگرا سبب تولید جریان عرضی در کانال‌ها و دندانه‌ها برای توزیع بهتر واکنش‌دهنده‌ها در پیل سوختی با کانال‌های همگرا واگرا می‌گردد. این سرعت عرضی سبب افزایش 6 درصدی مصرف سوخت در پیل با کانال‌های همگرا واگرا نسبت به پیل با کانال‌های مستقیم معمولی در ولتاژ عملکردی 0/7 ولت می‌شود اما به‌دلیل کاهش مساحت کانال‌های این پیل نسبت به پیل معمولی، چگالی جریان در این پیل 10 درصد کمتر از پیل با کانال‌های مستقیم است. در ولتاژهای عملکردی بالاتر از 0/55 ولت، پیل سوختی با کانال‌های همگرا واگرا به علت وجود جریان‌های عرضی مصرف سوخت بیشتری نسبت به پیل سوختی با کانال‌های مستقیم دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Three-Dimensional Numerical Study of Solid Oxide Fuel Cell Performance with Converging Diverging Flow Field

نویسندگان [English]

  • Hanieh Hesami 1
  • Mehdi Borji 2
  • Javad Rezapour 3
1 Mechanical engineering. Azad University. Lahijan. Iran
2 Mechanical Engineering/Lahijan Azad University/Iran/Lahijan
3 Mechanical Engineering/ Lahijan Azad University/Iran/ Lahijan
چکیده [English]

The main important roles of bipolar plates in solid oxide fuel cells are the uniform distribution of reactants to the reaction sites, the collection of current, and the separation of each cell from another. Therefore, the performance of a solid oxide fuel cell is highly dependent on air and fuel flow channel design. In order to investigate how the geometry of air and fuel flow channels affects performance, current, and power density, simulation results are discussed to evaluate the performance of two types of fuel cells with direct ducts and converging-diverging ducts. In this research, a three-dimensional model of an anode-supported hydrocarbon fueled solid oxide fuel cell is presented. The results show that the pressure difference between the converging diverging channels produces a transverse flow in the channels and ribs which is in favor of better distribution of the reactants in the fuel cell with the converging diverging channels. This transverse velocity causes a 6% increase in fuel consumption in the cell with converging diverging channels than the cell with direct channels at a voltage of 0.7V, but due to the reduction of the reaction area of this cell compared to the usual cell, the current density is 10% lower. At voltages above 0.55V, fuel cells with converging diverging channels have a higher fuel consumption than fuel cells with direct channels due to the presence of transverse flows.

کلیدواژه‌ها [English]

  • Solid oxide fuel cell
  • Converging diverging channels
  • Bipolar plates design
  • Transverse flow
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