کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4993113 | 1457614 | 2017 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of aspect ratio on the mean flow field of a surface-mounted finite-height square prism
ترجمه فارسی عنوان
تأثیر نسبت ابعاد به میدان متوسط جریان یک منشور مربع قد با ارتفاع سطح
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
بدن بلغ منشور مربع محدود نزدیک بیداری، جداسازی، پایان آزاد ساختار گرداب،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The flow around surface-mounted, finite-height square prisms at a Reynolds number of Reâ=â4.2âÃâ104 was investigated experimentally in a low-speed wind tunnel using particle image velocimetry. The thickness of the boundary layer on the ground plane relative to the width of the prism was δ/Dâ=â1.5. Four prism aspect ratios were tested, AR =â9, 7, 5, and 3, to study how the aspect ratio influences the flow field close to the prism. Upstream of the prism, lowering the aspect ratio from AR =â9 to AR =â3 causes the stagnation point on the upstream face to move closer to the free end, but there is no influence on the location and strength of the horseshoe vortex. Lowering the aspect ratio from AR =â9 to ARâ=â3 causes the cross-stream vortices in the upper and lower halves of the wake to move downstream and upstream, respectively; the latter vortex is absent for ARâ=â3, suggesting this prism sits below the critical aspect ratio. Above the free end of the prism, within the region of separated flow, lowering the aspect ratio from ARâ=â9 to ARâ=â3 shifts the location of the cross-stream vortex farther downstream. For the prism of ARâ=â3, reverse flow above the free end is stronger yet more unsteady compared to the more slender prisms, while the streamwise edge vortices are smaller and weaker.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 65, June 2017, Pages 1-20
Journal: International Journal of Heat and Fluid Flow - Volume 65, June 2017, Pages 1-20
نویسندگان
D. Sumner, N. Rostamy, D.J. Bergstrom, J.D. Bugg,