کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8062977 1520636 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Drag crisis of a circular cylinder near a plane boundary
ترجمه فارسی عنوان
بحران سیلندر دایره ای نزدیک یک مرز هواپیما را بکشید
کلمات کلیدی
بحران را بکشید اثر مجاورت دیوار، سیلندر دایره ای شماره رینولدز بحرانی،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی دریا (اقیانوس)
چکیده انگلیسی
The pressure distribution and the hydrodynamic forces on a circular cylinder placed near a plane boundary are investigated experimentally over a range of Reynolds numbers (Re) of 1.1 × 105-4.3 × 105 and gap (G) to cylinder diameter (D) ratio (G/D) of 0-1.0. The objective of the study is to quantify the influence of G/D on the force coefficients when the boundary layer on the cylinder surface transits from laminar to turbulent. The hydrodynamic forces acting on the cylinder are obtained by integrating the measured pressure around the cylinder surface. A significant drag reduction from about 0.9 to 0.35 is observed for G/D≥0.5 in the range of Re = 1.9 × 105-2.7 × 105. At smaller G/D values of 0.25 and 0.1, the drag coefficient shows much less reduction than those observed at larger G/D values. No obvious drag reduction is found at G/D  = 0.01 and 0. Based on the observed features of pressure distributions and force coefficients, the boundary layer transition from laminar to turbulent is inferred for all the gap ratios (G/D = 0 ∼ ∞).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ocean Engineering - Volume 154, 15 April 2018, Pages 133-142
نویسندگان
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