کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7176054 1466596 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental study of extreme thrust on a tidal stream rotor due to turbulent flow and with opposing waves
ترجمه فارسی عنوان
مطالعه تجربی نیروی شدید بر روی روتور جریان جزر و مدی به علت جریان آشفته و با امواج متضاد
کلمات کلیدی
توربین جریان توربین، آشفتگی کانال باز موج و جریان،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی
Time-varying thrust has been measured on a rotor in shallow turbulent flow at laboratory scale. The onset flow has a turbulence intensity of 12% at mid depth and a longitudinal turbulence length scale of half the depth, about 5 times the vertical scale, typical of shallow flows. The rotor is designed to have thrust and power coefficient variations with tip speed ratio close to that of a full-scale turbine. Three extreme probability distributions give similar thrust exceedance values with the Type 1 Pareto in mid range which gives 1:100, 1:1000 and 1:10 000 exceedance thrust forces of 1.38, 1.5 and 1.59 times the mean value. With opposing waves superimposed the extreme thrust distribution has a very similar distribution to the turbulent flow only. Exceedance forces are predicted by superposition of a drag force with drag coefficient of 2.0 based on the wave particle velocity only and with an unchanged mean thrust coefficient of 0.89. These values are relevant for the design of support structures for marine turbines.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Fluids and Structures - Volume 51, November 2014, Pages 354-361
نویسندگان
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