کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
646267 884560 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation of transpiration cooling for sintered metal porous struts in supersonic flow
ترجمه فارسی عنوان
بررسی تعرق ترانسپوراسیون برای ستون های متخلخل فلز متخلخل در جریان ابررسانی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی


• A sintered metal porous struts using transpiration cooling was put forward and numerically investigated.
• The effects of different coolant conditions, strut structures and material properties were analyzed.
• The fuel residence time in the chamber increased with the increasing coolant blowing ratio.
• The strut leading edge was best cooled when the strut wedge angle is near 30°.

Struts are used to inject fuel into the combustor in some scramjet engines, where the flow within the combustor and nozzle is always supersonic. Tremendous aerodynamic heating causes challenging design issues concerning the thermal protection of the strut. This study investigates cooling of a sintered porous strut using transpiration cooling to protect the strut from ablation. Numerical simulations were used to study the transpiration cooling for different strut structures, material properties and coolant conditions. The influences of these parameters on the transpiration cooling of the strut were analyzed for a main stream Mach number of 2.5 and a total temperature of 1920 K. The results show that the surface average cooling effectiveness increasing extent decreases with the increasing coolant blowing ratio. Meanwhile, the retention time of mixture of main stream and injected coolant increases with the increasing coolant blowing ratio. The wedge angle of the strut has a significant influence on the cooling performance and the optimum strut wedge angle is near 30°. Increasing the strut material thermal conductivity also enhances the cooling effectiveness and reduces the thermal stresses.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 70, Issue 1, 5 September 2014, Pages 240–249
نویسندگان
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