بررسی حساسیت توزیع تنش گرمایی برای یک پیل سوختی اکسید جامد صفحه‌ای

نوع مقاله : گرایش پیشرانش و انتقال حرارت

نویسندگان

دانشکده مکانیک، دانشگاه خواجه نصیر الدین طوسی

چکیده

تبدیل انرژی شیمیایی به انرژی الکتریسیته به‌واسطه دستگاه الکترو-شیمیایی پیل سوختی انجام می‌گیرد. به‌وسیله دمای عملیاتی بالای پیل سوختی اکسید جامد (بین 700 و 1000)، تنش گرمایی به وجود آمده که عامل اصلی شروع و انتشار ترک است. این پدیده ممکن است باعث نشت گاز، ناپایداری ساختار و توقف عملیات SOFC قبل از عمر مفید آن باشد. هدف این پژوهش ارائه روشی برای پیش‌بینی شروع ترک‌ها در یک SOFC صفحه‌ای متخلخل ناهمسانگرد است. دما و توزیع تنش محاسبه می‌شود. در این روش از ضریب شدت تنش و انتگرال-جی مواد برای پیش‌بینی شروع ترک در داخل آند و کاتد متخلخل استفاده شده است. نتایج تحقیق نشان ‌داد که بالاترین تنش گرمایی در گوشه‌های بالای کاتد و در گوشه‌های پایین‌ آند رخ می‌دهد. به‌علاوه، ضخامت الکترود کاتد در سمت چپ، به میزان %5/1 افزایش می‌یابد. درنهایت، شروع ترک در سمت چپ بین گوشه‌های بالایی و پایینی کاتد رخ می‌دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Analysis of Thermal Stress Distribution Sensitivity in a Planar Solid Oxide Fuel Cell

نویسندگان [English]

  • imad fahs
  • majid ghasemi
faculty of mechanical engineering, K.N.Toosi university
چکیده [English]

A fuel cell is an electro-chemical tool capable of converting chemical energy into electrical energy. The high operating temperature of the solid oxide fuel cell (SOFC), (between 700oC to 1000oC), causes thermal stress which is the origin of crack initiation and propagation. Thermal stress causes gas escape, structure variability and SOFC operation cessation before its lifetime. The purpose of the current paper is to present a method that predicts the thermal stress distribution and forecasts the beginning of fissure or crack occurrences in an anisotropic porous electrode of the planar SOFC. The governing coupled non-linear differential equations of heat transfer, fluid flow, mass transfer, mass continuity, and momentum are solved numerically. A code based on computational fluid dynamics (CFD), computational structural mechanics and finite element method (FEM) is developed and utilized. The results show that the highest thermal stress occurs at the lower corners of anode and the upper corners of cathode. The cathode’s thickness at the left side increases by 1.5% and the concentrated temperature and thus the fissure occurs between the top and bottom left corners of the cathode.

کلیدواژه‌ها [English]

  • solid oxide fuel cell
  • computational fluid dynamic
  • finite element
  • thermal stress
  • stress intensity factor
  • crack initiation

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سابقه مقاله

  • تاریخ دریافت: 11 شهریور 1399
  • تاریخ پذیرش: 11 شهریور 1399
  • تاریخ انتشار: 01 دی 1399

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