تحلیل انتقال حرارت ناپایای متحرک دوبعدی در لوله سلاح با استفاده از روش تربیع دیفرانسیلی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه صنعتی مالک اشتر، تهران

چکیده

در این پژوهش پدیده‌ انتقال حرارت درون لوله‌ سلاح به‌صورت دوبعدی و گذرا با استفاده از روش تربیع دیفرانسیلی موردبررسی قرار گفت. برای اعمال شرایط کلی در دامنه‌ حل، حجم داخل لوله به دو ناحیه مجزا تقسیم شد. بخشی در معرض سیال با دما و فشار بالا ناشی از احتراق خرج پرتاب بوده و بخشی نیز در معرض سیال در شرایط محیط در نظر گرفته شد. با گذشت زمان، مرز جداکننده دو ناحیه (گلوله) به جلو حرکت می‌کند. بنابراین، حجم اشغال‌شده توسط سیال ناحیه پشتی افزایش و حجم اشغال‌شده توسط سیال ناحیه جلویی کاهش می‌یابد. شرط مرزی گره‌های واقع در جداره‌ داخلی در هر گام زمانی با توجه به موقعیت محوری گلوله تعیین می‌گردند. گره‌های واقع‌شده در قسمت پشتی گلوله دارای شرط مرزی سیال با دما و فشار بالا بوده و گره‌های واقع‌شده در قسمت جلویی نیز دارای شرط مرزی سیال در محیط هستند. با توجه به شرایط عنوان‌شده، از معادله‌ کلی انتقال حرارت ناپایا در مختصات استوانه‌ای برای شبیه‌سازی استفاده گردید و توزیع دمای لوله سلاح تحت شلیک­های متناوب استخراج شد. در پایان از یک پژوهش تجربی برای بررسی صحت روش ارائه‌شده استفاده گردید. با مقایسه‌ نتایج، دقت بالای روش ارائه‌شده قابل‌ملاحظه بود. از نتایج این پژوهش می­توان برای تحلیل تنش لوله سلاح و تخمین میزان خوردگی و عمر آن استفاده کرد.

کلیدواژه‌ها


عنوان مقاله [English]

A two Dimensional Moving Transient Heat Transfer in a Gun Tube using Differential Quadrature Method

نویسندگان [English]

  • Hosein Lexian
  • Amir Yousefi
Maleke Ashtar UT, Tehran
چکیده [English]

In this study a heat transfer phenomena in a gun tube using Differential Quadrature Method was examined. The phenomena was dealt in a two dimensional transient manner. In order to apply a general condition to the problem, the internal volume of the cylinder was divided into two distinct zones. One zone was exposed to a fluid with high temperature and high pressure conditions due to the burning of the propellant. The other zone was exposed to a fluid in environmental condition. As the time passes, the bullet moves toward the front zone. Therefore the volume of the rear zone increases, while the volume of the front zone decreases. The boundary conditions of the internal boundary nodes are determined due to the axial position of the bullet. The boundary condition of the nodes located in the rear zone are set to the high temperature and high pressure fluid, while the boundary condition of the front nodes is set to standstill fluid conditions. According to the mentioned conditions, general transient heat conduction equation in cylindrical coordinate was utilized and temperature distribution of the gun tube was extracted for numerous rounds. Finally an experimental study was examined to validate the proposed method. A comparison between the simulation results and experimental results shows a high consistency between them. The results of this study can be used for stress analysis of gun tube and estimation of its erosion and lifetime.

کلیدواژه‌ها [English]

  • Differential Quadrature
  • Unsteady Heat Transfer
  • Axisymmetric
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