شبیه‌سازی عددی ارتعاشات القایی تیغه پیزوالکتریک و مطالعه اثر افزایش جرم نوک تیغه بر فرکانس تشدید و میزان ولتاژ تولیدی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، دانشگاه قم، قم، ایران

2 کارشناسی ارشد، دانشگاه قم، قم، ایران

چکیده

امروزه موضوع تأمین انرژی یکی از چالش‌های کلیدی به‌ شمار می‌رود. در تحقیقات سال‌های اخیر به‌منظور جستجو برای منابع انرژی پایدار، تجدیدپذیر و ارزان، برداشت انرژی از ارتعاشات ناشی از جریان سیال از اهمیت بالایی برخوردار است. در پژوهش حاضر، یک دستگاه برداشت انرژی از ارتعاشات ناشی از جریان هوا، متشکل از یک‌تیغة پیزوالکتریک موردمطالعه قرار گرفته است. این تیغه با فاصلۀ مشخصی در پایین‌دست یک سیلندر دایروی در معرض جریان سیال قرار دارد و شبیه‌سازی رفتار آن به کمک یک کد UDF اعمال شده در محیط نرم‌افزار فلوئنت انجام شده است. بر طبق نتایج به‌دست‌آمده از این مطالعه، جرم تیغۀ دربردارندۀ لایه پیزوالکتریک یکی از مهم‌ترین عوامل مؤثر بر میزان برداشت انرژی است و افزایش آن موجب بهبود در میزان ولتاژ خروجی خواهد شد. همچنین در این مطالعه تمرکز ویژه بر بررسی احتمال وقوع پدیدۀ تشدید با تغییر در مقدار جرم نوک تیغه قرار دارد و مشاهده می‌شود که با افزایش جرم قرار گرفته بر نوک تیغه از 9/0 به 5/1 گرم، به دلیل کاهش فرکانس طبیعی تیغه، سرعت مورد نیاز جریان سیال برای وقوع پدیده تشدید تا 20 درصد می‌تواند کاهش یابد. در این پژوهش اثر تغییرات جرم افزوده بر نوک تیغه به‌ازای 3 مقدار مختلف بررسی شده‌ که در تحقیقات پیشین مشاهده نمی‌شود

کلیدواژه‌ها


عنوان مقاله [English]

Numerical Simulation of Induced Vibrations of the Piezoelectric Blade and Studying the Effects of Increasing Blade Tip Mass on the Resonant Frequency and the Output Voltage

نویسندگان [English]

  • Mohammad Kazem Moayyedi 1
  • Elaheh Razani 2
1 Associate Professor, University of Qom, Qom, Iran
2 Master's degree, University of Qom, Qom, Iran
چکیده [English]

Nowadays, the issue of energy supply is one of the key challenges. In recent years, in order to search for sustainable, renewable, and low cost energy sources, energy harvesting from vibrations caused by fluid flow has great importance. In the present study, an energy-harvesting device from airflow vibrations consisting of a piezoelectric blade has been studied. The blade is exposed to fluid flow at a certain distance downstream of a circular cylinder, and its behavior is simulated using a UDF code implemented to the Fluent software. According to the results of this study, the mass of the blade containing the piezoelectric layer is one of the most important factors affecting the rate of energy harvesting and increasing it will improve the output voltage. Also, in this study, the special focus is on investigation the possibility of resonance phenomenon with a change in the mass of the blade tip. It is observed with increasing mass on the blade tip from 0.9 to 1.5 g, due to the reduction of the natural frequency of the blade, the velocity of the fluid flow required for the resonance phenomenon can be reduced by up to 20%. In this research, the effect of changes of mass which is added on the tip of the blade was investigated for 3 different values, which was not observed in the previous researches.
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کلیدواژه‌ها [English]

  • Computational Fluid Dynamics (CFD)
  • Energy Harvesting
  • Piezoelectric Blade
  • Resonance
  • Induced Vibrations
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