تحقیقات موتور

تحقیقات موتور

تحلیل عددی استفاده از فناوری‏ نوین ساختار هندسی مشبک در افزایش انتقال گرمای داخلی پره‏‌های توربین گاز

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران
چکیده
توربین‌های گازی به عنوان یکی از مهمترین موتورهای احتراق داخلی در صنایع و نیروگاه‌ها و همچنین حمل و نقل هوایی مطرح می‌گردد. یکی از دغدغه‌های سازندگان این موتور احتراق داخلی افزایش توان و بازده گردا است. یکی از روش‌های افزایش قدرت و بازده حرارتی آن، افزایش دمای هوای ورودی به گردا گاز است اما این روش با توجه به جنس و همبستة مورد استفاده در پره‌ها محدودیت‌هایی از جمله تغییر شکل و خرابی آن‌ها را در پی دارد، بنابراین استفاده از فناوری‏ و روش‌های نوین برای کاهش دمای پره‌ها و افزایش بازده کلی گردا امری مهم و ضروری است که یکی از فناوری‏‌های نوین، استفاده از خنک کاری ماتریسی است. در این مقاله، هندسة مشبک با دو زیرلایه الگوسازی شده است و هر لایه‌، مجهز به 13 زیردالان فرعی با زاویه ۴۵ درجه و خلاف جهت یکدیگر است. پس از شبیه‌‏سازی و آنالیز عددی، نتایج برای تغییرات انتقال حرارت و افت فشار برای عدد رینولدز از 10000 تا ۴۰۰۰۰ مورد تحلیل و مقایسه قرار گرفته‌ است. با تحلیل و بررسی نتایج، مشخص می‌شود که به دلیل زوایای برخورد سیال در زیردالان‌ها و اثر تغییر برای در آن‌ها انتقال حرارت به طور قابل توجهی افزایش می‌یابد، به گونه‌ای که انتقال حرارت از 3.1 تا 3.9 برابر افزایش می‌یابد که بیشترین مقدار آن در رینولدز 10000 و کمترین مقدار افزایش انتقال حرارت در عدد بی بعد رینولدز 40000 مشاهده گردید. همچنین انتقال حرارت در نقاط برخورد در هر زیر‌دالان نسبت به نقاط چرخش در مسیر حرکت سیال 50 درصد بیشتر است.
کلیدواژه‌ها

عنوان مقاله English

Numerical analysis of the effect of new matrix network structure technology to enhancement the internal heat transfer of gas turbine blades

نویسندگان English

Ashkan Rafiei
Hamidreza Shahbazian
Ghanbar Ali Sheikhzadeh
Department of Mechanical Engineering, University of Kashan, Kashan, Iran
چکیده English

Gas turbines are recognized as one of the most significant internal combustion engines used in industries, power plants, and aviation. A primary concern for manufacturers of internal combustion engines is enhancing the power and efficiency of these turbines. One effective approach to boost both power and thermal efficiency in gas turbines is to raise the inlet air temperature. However, this method has limitations due to the materials and alloys used in turbine construction, necessitating the exploration of new technologies and methods to increase performance. One such innovative technology is matrix cooling. In this study, the geometry of the matrix is modeled using two substrates, with each layer featuring 13 sub-channels angled at 45 degrees and oriented oppositely to one another. Following simulation and numerical analysis, the results regarding heat transfer variations and pressure drops across a Reynolds number range of 10,000 to 40,000 were compared. The analysis reveals that the angles of fluid collision under the channels and the effects of directional changes significantly enhance heat transfer. Specifically, heat transfer rates increased from 3.1 to 3.9 times, with the highest enhancement observed at a Reynolds number of 10,000 and the lowest at a Reynolds number of 40,000. Additionally, heat transfer at the collision points within each sub-channel was found to be 50% greater than at the turning points along the fluid's path.

کلیدواژه‌ها English

Internal Combustion Engine
Gas Turbine
Matrix Cooling
Grid Structure
Hydrothermal Performance
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  • تاریخ دریافت 16 آذر 1403
  • تاریخ بازنگری 29 آذر 1403
  • تاریخ پذیرش 04 دی 1403