نویسندگان

دانشکده مهندسی مکانیک، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران

چکیده

با توجه به روند رو به اتمام منابع سوخت فسیلی و ضرورت استفاده از انرژی­‌های تجدیدپذیر، می­‌بایست مطالعات مناسب در راستای بررسی­‌های فنی و عملکردی در خصوص این منابع صورت پذیرد. لذا در این پژوهش پیل سوختی پلیمری لوله‌­ای شکل به ­عنوان یک منبع انرژی مناسب با هندسه سه بعدی به­ صورت عددی، شبیه­‌سازی و بررسی شده است. برای بررسی جامع، معادلات پیوستگی، ممنتوم، انرژی، تنش- کرنش و برهم کنش سیال- جامد-گرما در حالت پایا، به‌وسیله یک کد عددی المان محدود تعریف، با یکدیگر کوپل و سپس حل شده‌اند. با فرض تغییر ولتاژ پیل از 0/95 تا 0/4 ولت، عبور جریان­ تراکم پذیر سوخت و هوا در داخل کانال­‌ها و محیط­‌های متخلخل الکترود و کاتالیست و همچنین حدود 5 درجه افزایش دمای میانگین پیل، باعث تقریباً 35 نانو متر جابجایی در بخش‌­های مختلف می‌شود. این جابجایی­‌های ناشی از برهم کنش سیال- جامد- گرما موجب ایجاد تنش‌­های گرمایی و مکانیکی می­‌شوند. تنش بیشینه در حدود 3500 کیلو نیوتن بر مترمربع در الکترولیت با توجه به محدودیت جابجایی آن (میانگین جابجایی 12/8 نانو متر) ایجاد می‌شود. سپس، رابطه تغییرات ولتاژ با چگالی جریان، تنش، سرعت جریان سوخت، جابجایی و دمای پیل سوختی نشان داده شد. همچنین نتایج نشان داد که فرض بر هم­کنش سیال- جامد- گرما توان پیل سوختی را تا حدود 3 درصد کاهش می­‌دهند. در پایان اثر پارامترهای مختلف از جمله شعاع کانال سوخت و هوا و رسانایی الکترونی و یونی بررسی شد. به ­عنوان مثال، در ولتاژ 0/4 ولت، کاهش 20 درصدی شعاع کانال سوخت و هوا و همچنین افزایش 100 درصدی رسانایی الکترونی و یونی به‌ترتیب باعث افزایش حدود 2/17، 0/05، 3/69 و 40 درصد چگالی جریان الکتریکی می­‌شود

کلیدواژه‌ها

عنوان مقاله [English]

3D Investigation of Tubular PEM Fuel Cell Performance Assuming Fluid- Solid- Heat Interaction

نویسندگان [English]

  • M. Keyhanpour
  • M. Ghasemi

چکیده [English]

According to the declining trend of fossil fuel resources and the need to use renewable energies, appropriate research should be conducted for technical and functional studies in this regard. Therefore, in this research, a tubular PEM fuel  cell as a suitable energy source with three-dimensional geometry has been numerically simulated and investigated. For a comprehensive study, the equations of continuity, momentum, energy, stress-strain, and fluid-solid-heat interaction at steady state are defined, coupled together, and then solved by a finite element numerical code. Assuming the cell voltage changes from 0.95 to 0.4 volts, the passage of compressible fuel and air through the channels and porous media of the electrode and catalyst, and also about 6 degrees increase in the average cell temperature, causes approximately 35 nm displacement in different parts. These displacements, due to fluid-solid-heat interactions, cause thermal and mechanical stresses. The maximum stress is about 3500 kN/m2  in the electrolyte due to its displacement limit (average displacement 12.8 nm). Then the relation of voltage variation with current density, stress, fuel flow rate, displacement and fuel cell temperature was shown. Also the results showed that the assumption of fluid-solid-heat interaction reduces the fuel cell power density by about 3%. Finally, the effect of different parameters such as fuel and air channel radius, electronic and ionic conductivity were investigated. For example, at a voltage of 0.4 volt, 20 percent reduction in the radius of air or fuel channels, or 100 percent increase in the electron or ionic conductivity, increases the electrical current density by about 2.17, 0.05, 3.69, and 40 percent, respectively.

کلیدواژه‌ها [English]

  • Tubular PEM fuel cell
  • Three dimensional geometry
  • energy
  • Stress- strain
  • Fluid- solid- heat interaction
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