کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
792249 1466582 2016 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Energy harvesting with two parallel pinned piezoelectric membranes in fluid flow
ترجمه فارسی عنوان
برداشت انرژی با دو غشاء پیزوالکتریکی موازی در جریان مایع
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی

The pinned and clamped configurations of a single piezoelectric membrane placed in free stream flow were extensively compared in terms of energy harvesting performance and spatiotemporal variations in the membrane's displacement and curvature. The results convincingly show a considerable gain in the harvested energy of the pinned membrane due to the broad region with large curvature. The self-adaptive nature of the pinned membrane in response to different flow directions was also demonstrated. A comprehensive study at the reduced flow speed regime U* =22.8 to 38 was made of two parallel pinned membranes with different cross-flow separation distances (D/L=0.6 to 2.2). The shapes of the two flapping membranes were visualized with a high-speed camera while the synchronous variation of the terminal load's voltage on each membrane was recorded. At small separation distance 0.6 ≤ D/L ≤ 0.8, the membranes flapped with a phase difference of 0.5 π at U*=22.8 to 28.5; the increase in velocity resulted in a switch to the in-phase flapping mode. At D/L = 1.0 to 1.8, the two membranes flapped in the anti-phase mode for the entire velocity region U* = 22.8 to 38.0, along with a considerable gain in the harvested energy over the other coupled modes. The results indicated that a large region (D/L=1.0–1.8, U* =22.8–38) with the anti-phase coupling in the D/L-U* plane was suitable for energy harvest. As the separation distance increases further to 2.0≤D/L ≤ 2.2, the membranes flapped at different frequencies. Finally, the influence of the terminal load on the power was determined for the separation distance D/L=1.2; the anti-phase flapping membranes were connected into circuits with reversed electrode arrangements, reaching a peak power P=10.31 mW at the optimal terminal load for U* =36.1.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Fluids and Structures - Volume 65, August 2016, Pages 381–397
نویسندگان
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