فناوری در مهندسی هوافضا

فناوری در مهندسی هوافضا

بازطراحی هندسه مجاری خنک‌کننده تیغه توربین گاز برای کاهش بیشینه دمای تیغه

نوع مقاله : علمی پژوهشی

نویسندگان
1 گروه مهندسی مکانیک دانشگاه صنعتی امیرکبیر، تهران، ایران
2 گروه آموزشی مهندسی مکانیک،دانشگاه صنعتی امیرکبیر،تهران،ایران
3 گروه مهندسی مکانیک، دانشکده مهندسی، دانشگاه اراک ، اراک، ایران
10.22034/jtae.2026.10.3.1
چکیده
در این مقاله، بهینه‌سازی هندسه مجاری خنک‌کننده داخلی تیغه توربین گاز با هدف کاهش بیشینه دمای سطح تیغه مورد بررسی قرار گرفته است. روش تحقیق بر پایه شبیه‌سازی عددی سه‌بعدی جریان کوپل‌شده با انتقال حرارت و بهینه‌سازی ترکیبی تک‌متغیره و الگوریتم تاگوچی بوده که با اعتبارسنجی بر اساس داده‌های تجربی هیلتون انجام پذیرفته است. مقاله به دو بخش اصلی تقسیم شده است: بخش نخست، توزیع دمای سطح تیغه در پیکربندی‌های مختلف مجاری خنک‌کننده را بررسی کرده تا تأثیر تعداد و توزیع این سوراخ‌ها بر انتقال حرارت، ویژگی‌های جریان، بیشینه دمای سطح و دبی کل جرم ارزیابی شود و بخش دوم، جریان خارجی حول تیغه توربین گاز به عنوان عامل تعیین‌کننده در مکانیزم انتقال حرارت جابجایی خارجی مورد بررسی دقیق قرار گرفته است، به طوری که تغییرات رژیم جریان از آرام به آشفته، مستقیماً بر نرخ تبادل حرارتی سطحی تأثیر می‌گذارد و در نتیجه توزیع دما و راندمان کلی سیستم را شکل می‌دهد. نتایج نشان داده‌اند که با افزایش تعداد سوراخ‌ها از یک تا ده، بیشینه دمای سطح از ۸۱۱٫۳ کلوین به ۷۲۸٫۹ کلوین کاهش یافته، اما نرخ این کاهش پس از شش سوراخ به شدت کاهشی شده است. پیکربندی بهینه شش‌سوراخ با کاهش ۶۵ کلوینی دما نسبت به حالت پایه، یکنواختی حرارتی بالا و دبی متعادل شناسایی شده است. ضریب انتقال حرارت جابجایی خارجی در نواحی گذار به آشفتگی و نزدیک نوک تیغه پیک‌های قابل توجهی نشان داده که مکان‌یابی حفره‌ها براساس آن‌ها انجام گرفته است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Redesigning the Cooling Channel Geometry of Gas Turbine Blades to Reduce Peak Surface Temperature

نویسندگان English

Amin valizade pasha 1
seyyed salman Norazar 2
Hamed Safikhani 3
1 Department of Mechanical Engineering، Amirkabir university of Technology، Tehran، Iran
2 Department of Mechanical Enhineering,Amirkabir University of technology
3 Department of Mechanical Engineering، Faculty of Engineering، Arak University، Arak، Iran
چکیده English

This study focuses on optimizing the internal cooling channel geometry of gas turbine blades to reduce their peak surface temperature. The paper is structured in two main parts: The first part examines the blade surface temperature distribution in different cooling channel configurations to evaluate the effect of the number and distribution of these holes on heat transfer, maximum surface temperature, and total mass flow rate a nd the second part, the external flow around the gas turbine blade has been carefully examined as a determining factor in the external convection heat transfer mechanism, so that changes in the flow regime from laminar to turbulent directly affect the surface heat exchange rate and consequently shape the temperature distribution and overall efficiency of the system. Through a series of simulations, we observed that increasing the number of cooling holes from one to ten led to a noticeable drop in maximum surface temperature, from 811.3 K down to 728.9 K. However, the rate of improvement diminished significantly beyond six holes. The six-hole configuration emerged as the most effective, offering a 65 K reduction compared to the baseline, along with improved thermal uniformity and balanced mass flow. Additionally, the external convective heat transfer coefficient showed pronounced peaks near the blade tip and in transitional flow regions. These findings guided the strategic placement of cooling holes to maximize thermal efficiency.

کلیدواژه‌ها English

Cooling channel geometry optimization
gas turbine blade
external convective heat transfer coefficient
Taguchi algorithm
convective heat transfer
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مقالات آماده انتشار، پذیرفته شده
انتشار آنلاین از 10 خرداد 1405

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  • تاریخ اولین انتشار 10 خرداد 1405