کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7053716 | 1458011 | 2018 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental investigations of the effects of the injection angle and blowing ratio on the leading-edge film cooling of a rotating twisted turbine blade
ترجمه فارسی عنوان
بررسی تجربی اثر زاویه تزریق و نسبت دم به خنک سازی فیلم جلو پیشرو یک تیغه توربین پیچ خورده چرخشی
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کلمات کلیدی
لبه پیشرو، خنک کننده فیلم، تیغه دوار اثربخشی، کریستال مایع حرارتی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Experimental investigations were performed to study the effects of the injection angle of cylindrical holes and the blowing ratio on the leading-edge-region film cooling of a twisted turbine blade under rotating conditions. The experiments were carried out at a test facility with a 1-stage turbine using the thermochromic liquid crystal (TLC) technique. All experiments were performed at a rotating speed of 574â¯rpm with an average blowing ratio ranging from 0.5 to 2.0. The Reynolds number was fixed at 6.3378â¯Ãâ¯104 based on the mainstream velocity of the turbine outlet and the rotor blade chord length. CO2 was used as the coolant to achieve a coolant-to-mainstream density ratio of 1.56. The film-hole injection angles tested were 30°, 45° and 60°. The results show that both the injection angle and the blowing ratio have significant impacts on film cooling effectiveness. For αâ¯=â¯30° and αâ¯=â¯45°, the radial average film cooling effectiveness increases as the blowing ratio increases in all regions. For αâ¯=â¯60°, this effectiveness first increases and then decreases as the blowing ratio increases, with the case of Mâ¯=â¯1.5 yielding the best average cooling performance. At each blowing ratio, the αâ¯=â¯30° case always yields the highest streamwise average film cooling effectiveness in the region of â4.3â¯<â¯X/Dâ¯<â¯2. For 2.75â¯<â¯X/Dâ¯<â¯3.75, the effectiveness first increases and then decreases as the injection angle increases. For αâ¯=â¯30° and αâ¯=â¯45°, the area average film cooling effectiveness monotonously increases as the blowing ratio increases. For αâ¯=â¯60°, this effectiveness first increases and then decreases as the blowing ratio increases from 0.5 to 2.0, with the best blowing ratio Mâ¯=â¯1.5. Under the same blowing ratio, the αâ¯=â¯30° case always yields the highest area average film cooling effectiveness in the leading edge region.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 127, Part B, December 2018, Pages 856-869
Journal: International Journal of Heat and Mass Transfer - Volume 127, Part B, December 2018, Pages 856-869
نویسندگان
Hai-wang Li, Feng Han, Zhi-yu Zhou, Yi-wen Ma, Zhi Tao,