دانش و فناوری هوافضا

دانش و فناوری هوافضا

تعیین مشتقات دینامیکی بال با استفاده از دینامیک سیالات محاسباتی و ارایه روابط انتگرالی و غیرانتگرالی

نوع مقاله : مقاله پژوهشی

نویسنده
استادیار، مجتمع دانشگاهی هوافضا، دانشگاه صنعتی مالک‌اشتر
چکیده
هدف از این تحقیق، محاسبه مشتقات دینامیکی و ارایه روابط انتگرالی و غیرانتگرالی برای محاسبه برخی مشتقات دینامیکی یک بال است. برای محاسبه این مشتقات از دینامیک سیالات محاسباتی و معادلات ناویر-استوکس استفاده شده است. مشتقات دینامیکی، با استفاده از ضرایب آیرودینامیکی به‌صورت ناپایا و تحت حرکت هارمونیک خاصی که وابسته به مشتق دینامیکی است، تعیین شده‌اند. حرکت‌های هارمونیک به‌صورت توابع تعریف شده توسط کاربر1 و حرکت شبکه اعمال شده‌اند. نوع حرکت در محاسبات مشتقات دینامیکی موثر است. نتایج ضرایب و برخی مشتقات دینامیکی برای بال استاندارد AGARD-D ارایه شده است. بال دارای مقطع NACA 64A1012 است. نتایج برای این بال در فرکانس کاسته مختلف محاسبه شده است و نتایج با نتایج تجربی موجود مقایسه شده است. برخی نتایج در دو حالت بال متقارن و بال غیرمتقارن (جابجایی محور طولی بال در راستای نوک بال) محاسبه شده‌اند. مقایسه نتایج بیانگر دقت مناسب حل عددی در حالت‌های انتگرالی و غیرانتگرالی ارایه شده برای مشتقات دینامیکی است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Determination of wing dynamic derivatives using computational fluid dynamics and provide integral and non-integral relations

نویسنده English

Mahdi Hashemabadi
Assistant Professor, Faculty of Aerospace, Malek Ashtar University of Technology, Iran
چکیده English

The purpose of this research is to calculate a wing dynamic derivatives and provide integral and non-integral relations to calculate some dynamic derivatives. Computational fluid dynamics and Navier-Stokes equations have been used to calculate these derivatives. Dynamic derivatives are determined by using aerodynamic coefficients in unsteady form and under certain harmonic motion that is dependent on dynamic derivative. Harmonic motions are implemented as user-defined functions and grid motion. The type of motion is effective in dynamic derivative calculations. The results of the aerodynamic coefficients and some dynamic derivatives for the AGARD-D standard wing are presented. The wing has a NACA 64A1012 airfoil. The results for this wing have been calculated at different reduced frequencies and the results have been compared with the existing experimental results. Some results have been calculated in two cases of symmetric wing and asymmetric wing (displacement of the longitudinal axis of the wing along the tip of the wing). The comparison of the results shows the appropriate accuracy of the numerical solution in integral and non-integral modes presented for dynamic derivatives.

کلیدواژه‌ها English

dynamic derivatives
computational fluid dynamics
unsteady flow
integral relations
non-integral relations
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