کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
651204 1457402 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental study on transverse flow-induced oscillations of a square-section cylinder at low mass ratio and low damping
ترجمه فارسی عنوان
بررسی تجربی بر روی نوسانات ناشی از جریان عرضی یک سیلندر مربعی با نسبت کم وزنی و کم دمایی
کلمات کلیدی
نوسانات ناشی از جریان گذرا، سیلندر مربعی کانال آب ورودی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی


• Experimental study of transverse flow-induced oscillations of a square prism.
• This campaign enlarges existing experimental results published in the literature.
• A collapse of the normalized amplitude of oscillations to a single curve is found.
• Inverse of the actual frequency of oscillations is taken as the characteristic time.
• The amplitude of oscillations is quasi-linearly dependent on the reduced velocity.

This article presents experimental results concerning the transverse flow-induced oscillations of a square-section cylinder for several values of the mass ratio, ranging from 2.2 to 14.4, and low mechanical damping. Experiments were carried out in a re-circulated free-surface water channel. A rigid square-section cylinder was fixed to an elastic system made with dual (parallel) metallic blades connected by a rigid block. By this way the square-section cylinder is free to oscillate in the transverse (normal to flow) direction. The elastic system presents linear behavior in terms of stiffness and damping. The functional dependence between the steady-state amplitude and frequency of oscillations with reduced velocity is characterized. A re-normalization plot appears when steady-state amplitude of oscillations is plotted against the “true” reduced velocity, which is defined as the reduced velocity divided by the dimensionless frequency of oscillations. Experiments also allow to discuss other aspects, like the reduced velocity at which oscillations are expected to start depending on the value of the mass ratio, how close to sinusoidal (say, fixed amplitude and frequency) the oscillations are, or when quasi-steady conditions are expected to be met.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Thermal and Fluid Science - Volume 74, June 2016, Pages 286–295
نویسندگان
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