scholarly journals Water flow energy harvesters for autonomous flowmeters

2016 ◽  
Vol 773 ◽  
pp. 012019 ◽  
Author(s):  
Sebastien Boisseau ◽  
Alexandre-Benoit Duret ◽  
Matthias Perez ◽  
Emmanuel Jallas ◽  
Eric Jallas
Keyword(s):  
Water Flow ◽  
Energy Harvesters ◽  
Flow Energy

scholarly journals Vibration Performance of a Flow Energy Converter behind Two Side-by-Side Cylinders

2019 ◽  
Vol 7 (12) ◽  
pp. 435
Author(s):  
Mohammad Rasidi Rasani ◽  
Hazim Moria ◽  
Michael Beer ◽  
Ahmad Kamal Ariffin
Keyword(s):  
Three Dimensional ◽  
Reynold Number ◽  
Mean Amplitude ◽  
Navier Stokes ◽  
Cantilever Plate ◽  
Arbitrary Lagrangian Eulerian ◽  
Flow Solver ◽  
Energy Harvesters ◽  
Flow Energy ◽  
Flexible Plates

Flow-induced vibrations of a flexible cantilever plate, placed in various positions behind two side-by-side cylinders, were computationally investigated to determine optimal location for wake-excited energy harvesters. In the present study, the cylinders of equal diameter D were fixed at center-to-center gap ratio of T / D = 1 . 7 and immersed in sub-critical flow of Reynold number R e D = 10 , 000 . A three-dimensional Navier–Stokes flow solver in an Arbitrary Lagrangian–Eulerian (ALE) description was closely coupled to a non-linear finite element structural solver that was used to model the dynamics of a composite piezoelectric plate. The cantilever plate was fixed at several positions between 0 . 5 < x / D < 1 . 5 and - 0 . 85 < y / D < 0 . 85 measured from the center gap between cylinders, and their flow-induced oscillations were compiled and analyzed. The results indicate that flexible plates located at the centerline between the cylinder pairs experience the lowest mean amplitude of oscillation. Maximum overall amplitude in oscillation is predicted when flexible plates are located in the intermediate off-center region downstream of both cylinders. Present findings indicate potential to further maximize wake-induced energy harvesting plates by exploiting their favorable positioning in the wake region behind two side-by-side cylinders.

Experimental Study of a Self-Excited Piezoelectric Energy Harvester

2010 ◽  
Author(s):  
Hu¨seyin Dog˘us¸ Akaydın ◽  
Niell Elvin ◽  
Yiannis Andreopoulos
Keyword(s):  
Electrical Power ◽  
Natural Mode ◽  
Structural Vibrations ◽  
Energy Harvesters ◽  
Flow Energy ◽  
Piezoelectric Energy ◽  
Voltage Output ◽  
Aerodynamic Properties ◽  
Piezoelectric Cantilever ◽  
Measured Strain

In the present experimental work, we explore the possibility of using piezoelectric based fluid flow energy harvesters. These harvesters are self-excited and self-sustained in the sense that they can be used in steady uniform flows. The configuration consists of a piezoelectric cantilever beam with a cylindrical tip body which promotes sustainable, aero-elastic structural vibrations induced by vortex shedding and galloping. The structural and aerodynamic properties of the harvester alter the vibration amplitude and frequency of the piezoelectric beam and thus its electrical output. This paper presents results of energy-harvesting tests with one configuration of such a self-excited piezoelectric harvester using a PZT bimorph. In addition to the electrical voltage output, the strain on the surface of beam close to its clamped tip was also measured The measured strain and voltage output were perfectly correlated in the frequency range containing the first natural mode of vibration of the system. It was observed that about 0.24 mW of electrical power can be attained with this harvester in a uniform flow of 28 m/s.

Overview of Research on the Influence of Permeable Structures

2013 ◽  
Vol 405-408 ◽  
pp. 2115-2122
Author(s):  
Qian Qian Shang ◽  
Hui Xu ◽  
Guo Bin Li
Keyword(s):  
Water Flow ◽  
Flow Condition ◽  
River Regulation ◽  
Adverse Impact ◽  
Local Flow ◽  
Flow Energy ◽  
Similarities And Differences ◽  
Protective Structures

The protective structures on the shore often used in the river regulation and channel rectification works are divided into solid structures and permeable structures. The solid structures will cause an intensive change of the local flow condition, and lead to adverse impact as scouring of local foundation and edges; the permeable structures which can dissipate the flow energy are gradually popularized for use. Common permeable structures include the tetrahedron-like penetrating frame used for engineering and vegetation on the shore, etc. This paper takes the tetrahedron-like penetrating frame and vegetation for example, summarizes research on the behavior of water flow and sediment affected by permeable structures, discusses the similarities and differences as well as different effects of the functions of the solid structures and permeable structures, and finally concludes the features of application of permeable structures.

New Insights Into the Performance and Optimization of Galloping Flow Energy Harvesters

2014 ◽  
Author(s):  
Amin Bibo ◽  
Mohammed F. Daqaq
Keyword(s):  
Bluff Body ◽  
Lumped Parameter Model ◽  
Combined Loading ◽  
Design Parameters ◽  
Optimal Harvesting ◽  
Universal Curve ◽  
Response Curves ◽  
Energy Harvesters ◽  
Flow Energy ◽  
Mechanical Transduction

This paper presents a generalized formulation, analysis, and optimization of energy harvesters subjected to galloping and base excitations. The harvester consists of a cantilever beam with a bluff body attached at the free end. A nondimensional lumped-parameter model which accounts for the combined loading and different electro-mechanical transduction mechanisms is presented. The aerodynamic loading is modeled using the quasi-steady assumption with polynomial approximation. A nonlinear analysis is carried out and an approximate analytical solution is obtained. A dimensional analysis is performed to identify the important parameters that affect the system’s response. It is shown that the response curves of the harvester can be generated in terms of only three dimensionless loading parameters. These curves can serve as a complete design guide for scaling and optimizing the performance of galloping-based harvesters. As a special case study, a harvester subjected to only galloping excitations is analyzed. It is shown that, for a given shape of the bluff body and under quasi-steady flow conditions, the harvester’s dimensionless response can be described by a single universal curve irrespective to the geometric, mechanical, and electrical design parameters of the harvester. The universal curve is utilized to obtain the optimal harvesting circuit design parameters, that minimize the cut-in wind speed and maximize the output power, and predict the harvester’s total conversion efficiency.

Flow Energy Harvesters With a Nonlinear Restoring Force

2014 ◽  
Author(s):  
Ali H. Alhadidi ◽  
Amin Bibo ◽  
Mohammed F. Daqaq
Keyword(s):  
Bluff Body ◽  
Energy Harvester ◽  
Restoring Force ◽  
Energy Harvesters ◽  
Flow Energy ◽  
Nonlinear Restoring Force ◽  
Aerodynamic Loading ◽  
Lumped Parameter ◽  
Piezoelectric Cantilever ◽  
Different Shapes

This ppppaper examines the performance of a galloping energy harvester possessing a nonlinear restoring force. To achieve this goal, a flow energy harvester consisting of a piezoelectric cantilever beam augmented with a square-sectioned bluff body at the free end is considered. Two magnets located near the tip of the bluff body are used to introduce the nonlinearity which strength and nature can be altered by changing the distance between the magnets. A lumped-parameter aero-electromechanical model adopting the quasi-steady assumption for aerodynamic loading is presented and utilized to numerically simulate the harvester’s response. Wind tunnel tests are also performed to validate the numerical simulations by conducting upward and downward wind velocity sweeps. Results comparing the relative performance of several harvesters with potential functions of different shapes demonstrate that a mono-stable potential function with a hardening restoring force can outperform all other configurations.

scholarly journals PENGARUH VARIASI JARAK ANTARA KATUP LIMBAH DENGAN KATUP PENGHANTAR TERHADAP EFISIENSI POMPA HIDRAM PVC 2 INCHI PARAREL

2020 ◽  
Vol 5 (1) ◽  
pp. 37-41
Author(s):  
Defmit B.N Riwu ◽  
Dominggus G. H. Adoe ◽  
Seprianus Rudolf Membubu
Keyword(s):  
Potential Energy ◽  
Water Flow ◽  
Driving Force ◽  
Water Sources ◽  
Long Distance ◽  
Flow Energy

Abstrak Pompa hidram merupakan salah satu jenis pompa yang tidak membutuhkan energi listrik atau bahan bakar. Energi potensial dari sumber air yang dialirkan sebagai daya penggerak. Dimana alat ini bekerja pada sumber air yang memiliki kemiringan, sebab alat ini membutuhkan energi terjunan air dari ketinggian lebih besar atau sama dengan 1 meter yang masuk ke dalam pompa. Dalam pengoperasinya pompa ini mempunyai keuntungan yaitu dengan menggunakan pipa PVC yang dengan sederhana merancangnya juga dapat dibuat dengan peralatan bengkel. Penelitian ini dilakukan untuk mengetahui pengaruh variasi jarak antara katup limbah dengan katup penghantar terhadap efisiensi pompa hydram. Metode yang digunakan adalah experimen lapangan dengan beberapa perubahan pada variasi jarak antara katup limbah dengan katup penghantar adalah 10 cm, 20 cm,30 cm. Dari hasil penelitian bahwa debit pemompaan optimum mengalami peningkatan pada ukuran pendek yaitu 0,00011633 m3/detik, debit limbah semakin besar pada ukuran jarak panjang yaitu 0,00086013 m3/detik, dengan jumlah ketukan terjadi yaitu 84 kali. Sehingga efisiensi hidram menurut teori d’aubussion diperoleh hasil tertinggi yaitu 71,02 %. Kata Kunci: Pompa hidram 2 inchi, double katup limbah, katup penghantar, dan efisiensi D’aubuission Abstract Hydram pump is one type of pump that does not require electricity or fuel. Potential energy from water sources that is channeled as a driving force. Where this tool works at a source of water that has a slope, because this tool requires water flow energy from a height greater than or equal to 1 meter into the pump. In the operation of this pump has the advantage of using PVC pipes which are simple to design can also be made with workshop equipment. This research was conducted to determine the effect of variations in the distance between the waste valve and the delivery valve on the efficiency of the hydram pump. The method used is a real experimental with some changes in the variation of the distance between the waste valve and the delivery valve is 10 cm, 20 cm, 30 cm. From the results of the study that the optimum pumping discharge increased in the short size of 0.00011633 m3 / second, the greater the discharge of waste at a long-distance size of 0.00086013 m3 / second, with the number of beats occurring at 84 times. So that the efficiency of hydrams according to the theory of 'aubussion obtained the highest yield of 71.02%. Keywords: 2-inch hydram pump, double valve waste, delivery valve, and D'obuission efficiency.

An Underwater Magnetically Coupled Bistable Vibration Energy Harvester Using Wings

2019 ◽  
Author(s):  
Hong-Xiang Zou ◽  
Ke-Xiang Wei ◽  
Lin-Chuan Zhao ◽  
Wen-Ming Zhang ◽  
Lei Zuo ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Water Flow ◽  
Energy Harvester ◽  
High Reliability ◽  
Average Power ◽  
Vibration Energy ◽  
Coupling Mechanism ◽  
Vibration Energy Harvester ◽  
Water Flow Velocity ◽  
Flow Energy

Abstract Piezoelectric flow energy harvesting can be a potential way to yield endless electrical energy for small mechanical systems and wireless sensors. We propose a novel magnetically coupled bistable vibration energy harvester using wings for the applications in the water environment. The water flow energy can be harvested through the induced vibration of wings. The flextensional transducer can be packaged conveniently by using non-contact magnetic coupling mechanism. The magnetic force is amplified by the flextensional structure and transferred to the piezoelectric layer, thereby achieving higher power density and better reliability. A prototype was fabricated and tested in a water flume, which attended a maximum power of about 400 μW and the average power of 55 μW at the water flow velocity of 4 m/s. No significant variation occurred to the performance of the harvester after five days of continuous operation in the water, which indicates that the magnetically coupled vibration energy harvesting method has high reliability in the underwater environment.

scholarly journals Occurrence, Classification and Formation Mechanisms of the Organic-Rich Clasts in the Upper Paleozoic Coal-Bearing Tight Sandstone, Northeastern Margin of the Ordos Basin, China

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2694
Author(s):  
Guanqun Yang ◽  
Wenhui Huang ◽  
Jianhua Zhong ◽  
Ningliang Sun
Keyword(s):  
Water Flow ◽  
Higher Plants ◽  
Ordos Basin ◽  
Formation Mechanisms ◽  
Tight Sandstone ◽  
Flow Energy ◽  
Sedimentary Environments ◽  
Upper Paleozoic ◽  
The Ordos Basin ◽  
Thin Interlayer

The detailed characteristics and formation mechanisms of organic-rich clasts (ORCs) in the Upper Paleozoic tight sandstone in the northeastern margin of the Ordos Basin were analyzed through 818-m-long drilling cores and logging data from 28 wells. In general, compared with soft-sediment clasts documented in other sedimentary environments, organic-rich clasts in coal-bearing tight sandstone have not been adequately investigated in the literature. ORCs are widely developed in various sedimentary environments of coal-bearing sandstone, including fluvial channels, crevasse splays, tidal channels, sand flats, and subaqueous debris flow deposits. In addition to being controlled by the water flow energy and transportation processes, the fragmentation degree and morphology of ORCs are also related to their content of higher plants organic matter. The change in water flow energy during transportation makes the ORCs show obvious mechanical depositional differentiation. Four main types of ORC can be recognized in the deposits: diamictic organic-rich clasts, floating organic-rich clasts, loaded lamellar organic-rich clasts, and thin interlayer organic-rich clasts. The relationship between energy variation and ORCs deposition continuity is rarely studied so far. Based on the different handling processes under the control of water flow energy changes, we propose two ORCs formation mechanisms: the long-term altering of continuous water flow and the short-term water flow acting triggered by sudden events.

Design of a Compliant Flexure Joint for Use in a Flow Energy Harvester

2014 ◽  
Author(s):  
Punnag Chatterjee ◽  
Matthew Bryant
Keyword(s):  
Energy Harvester ◽  
Vibrational Energy ◽  
Electrical Power ◽  
Flow Induced Vibration ◽  
Vibration Energy Harvester ◽  
Energy Harvesters ◽  
Flow Energy ◽  
Flexure Mechanism ◽  
Multiple Components ◽  
Compact Design

This paper presents an initial experimental and computational investigation of a flow-induced vibration energy harvester with a compliant flexure mechanism. This energy harvester utilizes the aeroelastic flutter phenomenon to convert the flow energy to vibrational energy which can be converted into useful electrical power using piezoelectric transducers. However, unlike previous flutter-based flow energy harvesters [1] which require assembling multiple components to create the necessary aeroelastic arrangement, the device described here utilizes a monolithic, compact design to achieve the same. In this paper, we propose a flexure design for this device and model it using analytic methods and finite element simulations. A proof of concept energy harvester incorporating this flexure design has been fabricated and experimentally investigated in wind tunnel testing.

Exploiting a nonlinear restoring force to improve the performance of flow energy harvesters

2015 ◽  
Vol 117 (4) ◽  
pp. 045103 ◽  
Author(s):  
Amin Bibo ◽  
Ali H. Alhadidi ◽  
Mohammed F. Daqaq
Keyword(s):  
Restoring Force ◽  
Energy Harvesters ◽  
Flow Energy ◽  
Nonlinear Restoring Force
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