scholarly journals Performance Characteristics in Runner of an Impulse Water Turbine with Splitter Blade

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 303
Author(s):  
Lingdi Tang ◽  
Shouqi Yuan ◽  
Yue Tang ◽  
Zhijun Gao
Keyword(s):  
Energy Conversion ◽  
Flow Direction ◽  
Mechanical Energy ◽  
Experimental Tests ◽  
High Energy ◽  
Negative Energy ◽  
Water Turbine ◽  
Conversion Performance ◽  
Water Turbines ◽  
Current Energy

The impulse water turbine is a promising energy conversion device that can be used as mechanical power or a micro hydro generator, and its application can effectively ease the current energy crisis. This paper aims to clarify the mechanism of liquid acting on runner blades, the hydraulic performance, and energy conversion characteristics in the runner domain of an impulse water turbine with a splitter blade by using experimental tests and numerical simulations. The runner was divided into seven areas along the flow direction, and the power variation in the runner domain was analyzed to reflect its energy conversion characteristics. The obtained results indicate that the critical area of the runner for doing the work is in the front half of the blades, while the rear area of the blades does relatively little work and even consumes the mechanical energy of the runner to produce negative work. The high energy area is concentrated in the flow passage facing the nozzle. The energy is gradually evenly distributed from the runner inlet to the runner outlet, and the negative energy caused by flow separation with high probability is gradually reduced. The clarification of the energy conversion performance is of great significance to improve the design of impulse water turbines.

Handedness-controlled and solvent-driven actuators with twisted fibers

2019 ◽  
Vol 6 (6) ◽  
pp. 1207-1214 ◽  
Author(s):  
Bo Fang ◽  
Youhua Xiao ◽  
Zhen Xu ◽  
Dan Chang ◽  
Bo Wang ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Kinetic Energy ◽  
Energy Conversion ◽  
Conversion Coefficient ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
High Energy ◽  
Polar Solvents ◽  
Start Up

Handedness-controlled actuating systems are constructed from continuous twisted fibers with mirrored handedness, superb flexibility and mechanical robustness, affording impressive start-up torques driven by polar solvents, and controllably outputting rotor kinetic energy, harvesting electrical energy, and delivering mechanical energy with a high energy conversion coefficient.

scholarly journals WATER POWER GENERATOR FOR PUBLIC ROAD ILLUMINATION LIGHTS OF PADI VILLAGE MOJOKERTO

2020 ◽  
Vol 2 (2) ◽  
pp. 37-44
Author(s):  
Akhmad Solikin ◽  
Rohib Ilma Suktawan
Keyword(s):  
Electric Power ◽  
Rural Areas ◽  
Power Plants ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Electric Voltage ◽  
Street Lighting ◽  
Hydroelectric Generator ◽  
Water Turbine ◽  
Water Turbines

Electricity problems in rural areas more and more electric power is needed. Until now, power plants that use water turbines are environmentally friendly electricity producers, so the potential for energy from the air needs to be utilized to address the demand for electricity. Therefore, the solution to this problem is to use the "Design and Construction of Hydroelectric Generator for Public Street Lighting".  The generator is a source of electric voltage obtained by converting mechanical energy into electrical energy. The generator works based on the principle of electromagnetic induction, which is by rotating a coil in a magnetic field so that the induced GGL (Electric Motion Force) arises. In this thesis, a research is conducted on the Water Turbine Generator in the river in the village area of Padi Gondang Mojokerto as an object of water flow in order to generate electric power to reduce crime in the area in the form of a load object in the form of Public Street Lighting.

Radial Impulse Turbine for Wave Energy Conversion: A New Geometry

2008 ◽  
Author(s):  
B. Pereiras ◽  
F. Castro ◽  
A. El Marjani ◽  
M. A. Rodriguez
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Flow Direction ◽  
Mechanical Energy ◽  
Research Work ◽  
Flow Simulation ◽  
Flow Behaviour ◽  
Wells Turbine ◽  
Impulse Turbine ◽  
Local Flow

The Oscillating Water Column system (OWC) is an interesting concept for ocean wave energy extraction. Several kinds of air turbines have been used for pneumatic energy conversion to mechanical energy. The Wells turbine has been used widely in OWC plants. However, as an alternative the self-rectifying turbine called Impulse turbine has been studied during the last years. We are interested in the radial version of the Impulse turbine, which was initially proposed by McCormick. A former research work aimed to improve the knowledge of the local flow behaviour and the prediction of the performances for this kind of turbine has been carried out using CFD (FLUENT®). The objectives of that work were connected mainly to the elaboration of a suitable 3D model for air flow simulation in a radial Impulse turbine. Model validation was conducted through a comparison with available experimental results. In the present, the objective is, using the numerical model, to develop a new radial impulse turbine geometry that gets better performances than the original one. This new turbine geometry will be exploited next in a project for an OWC of 250 kW. In this paper we describe the flow behaviour and the performances of this new turbine. For that, we study the Torque and Input coefficients, the losses and flow direction in the turbine elements.

A Jet Condenser for Ocean Thermal Energy Conversion

1982 ◽  
Vol 104 (3) ◽  
pp. 153-157
Author(s):  
H. J. Richter ◽  
G. B. Wallis
Keyword(s):  
Energy Conversion ◽  
Thermal Energy ◽  
Cold Water ◽  
Mechanical Energy ◽  
Water Stream ◽  
Ocean Thermal Energy Conversion ◽  
Available Energy ◽  
Thermal Energy Conversion ◽  
Water Turbine ◽  
Ocean Thermal Energy

A novel idea to use a jet condenser for Ocean Thermal Energy Conversion (OTEC) plants is presented here. The jet condenser offers the advantage of a relatively simple device. It consists of a mixing section where the partially evaporated warm water and the cold water mix and condensation takes place. After the complete condensation, the water stream is employed to drive a water turbine. The basic thermodynamic principles are evaluated. Introducing realistic efficiencies for the jet condenser, about 20 to 25 percent of the available energy can possibly be expected to be converted into mechanical energy.

Fundamental Energy Transfer Mechanism of Turbomachinery

2002 ◽  
Author(s):  
Takaharu Tanaka
Keyword(s):  
Energy Transfer ◽  
Centrifugal Force ◽  
Mechanical Energy ◽  
Rotational Flow ◽  
Energy Transfer Mechanism ◽  
Centrifugal Pumps ◽  
Impeller Blade ◽  
Water Turbine ◽  
Fluid Particles ◽  
Water Turbines

Fundamental mechanisms of energy transfer, which is caused between impeller blade and fluid particles in centrifugal pumps and water turbines, are discussed together with as a turbomachinery under same theoretical basement. This leads to the result that the fluid flow which directs radial outward in pump and that radial inward in water turbine are neither caused by centrifugal force nor centripetal force, but caused by tangential forward force, which acts on the impeller blade in the direction perpendicular to rotational radius. Hydraulic energies of fluid particles transferred from mechanical to hydraulic energy in pump and that to be transferred from hydraulic to mechanical energy in water turbine appear as centrifugal force FHCF in rotational flow passage.

A machine-learning approach to predicting the energy conversion performance of centrifugal pump impeller influenced by blade profile

2021 ◽  
pp. 095440622110282
Author(s):  
Yanzhao Wu ◽  
Ran Tao ◽  
Di Zhu ◽  
Zhifeng Yao ◽  
Ruofu Xiao
Keyword(s):  
Neural Network ◽  
Machine Learning ◽  
Energy Conversion ◽  
Centrifugal Pump ◽  
Mechanical Energy ◽  
Traditional Theory ◽  
Pump Efficiency ◽  
Blade Profile ◽  
Blade Angle ◽  
Conversion Performance

Centrifugal pump is a kind of energy conversion machine for fluid delivering. It transfers the mechanical energy of impeller to the potential and kinetic energy of fluid. As a key factor in influencing the energy conversion performance of centrifugal pump, blade profile design is crucial. Traditional design concepts have ideal assumptions. To have a better design guidance, machine-learning based on neural network is used in this study. A typical centrifugal pump with simplified blade profile is numerically studied with experimental validation for a better discussion. Statistical results show that, for the high dimensional nonlinear relationship between blade angle and performance of centrifugal pump, neural network can adapt to this complex correlation better. The blade installation angle at leading-edge ( βLE′) and trailing-edge ( βTE′) and the wrap angle (Δ θ′) has significant correlation with the performance including pump head H, pump efficiency η, impeller head Himp, impeller efficiency ηimp and volute loss Δ Hvol. The influence level of blade angle follows the high-to-low order of Δ θ′, βLE′ and βTE′. Determination of blade profile can be done for improving the energy conversion efficiency. Optimal blade profiles have higher βLE′ and Δ θ′ with better flow-control ability. Compared with the blade parameters of the initial pump, the blade profile with the best centrifugal pump efficiency is the best βLE′ increased by 1.926°, Δ θ′ increased by 9.858°, Optimization of impeller efficiency βLE′ increased by 1.855°, Δ θ′ increased by 9.421°. Computational fluid dynamics indicate the elimination of vortex in impeller after optimal selection. Then, βTE′ and Δ θ′ are found influential in aggravating the circumferential flow component in this special circular-volute with generating higher loss. βTE′ has a positive correlation with impeller head which suits traditional theory. In general, the machine-learning using neural network is effective in determining blade profiles for enhancing the performance of centrifugal pump.

scholarly journals Methods to Improve Energy Conversion Efficiency of Dielectric Elastomer Generators

2019 ◽  
Vol 804 ◽  
pp. 63-67
Author(s):  
Heng Tong Cheng ◽  
Zhen Qiang Song ◽  
Shijie Zhu ◽  
Kazuhiro Ohyama
Keyword(s):  
Energy Conversion ◽  
Conversion Efficiency ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Input Voltage ◽  
Energy Conversion Efficiency ◽  
Stretch Ratio ◽  
Dielectric Elastomer ◽  
Conversion Performance ◽  
Ratio Range

Dielectric elastomer generators (DEGs) are based on the electromechanical response of the dielectric elastomer film sandwiched between the compliant electrodes on each side, which are capable of converting mechanical energy from diverse sources (e.g, ocean wave) into electrical energy. In essence, DEG is a voltage up-converter using mechanical energy to increase the electrical energy of the charge on a soft capacitor. We evaluated the effect of input voltage and the pre-stretch ratios on energy conversion efficiency of DEG. With a power supply of 2.2kV and pre-stretch ratio of 2, the maximum net electrical energy density and energy conversion efficiency in a single harvesting cycle were measured to be 413 J/kg and 15.8%, respectively. The experimental results showed that, with the higher input voltage and the larger stretch ratio range, higher the energy conversion performance of DEG can be achieved.

scholarly journals PENGARUH TWIST ANGLE BLADE TURBIN SAVONIUS BERPENGARAH ALIRAN APLIKASI PADA TURBIN AIR

INFO-TEKNIK ◽  
2018 ◽  
Vol 19 (2) ◽  
pp. 203
Author(s):  
Rendi Rendi ◽  
Abdurrahim Sidiq
Keyword(s):  
Mechanical Energy ◽  
Twist Angle ◽  
Mechanical Equipment ◽  
Turbine Performance ◽  
Water Turbine ◽  
Swivel Angle ◽  
Angle Blade ◽  
Water Turbines ◽  
Flow Guide ◽  
Positive Force

Water turbine is one of the mechanical equipment that functions to generateenergy into mechanical energy. There are types of water turbines one of which isthe Savonius water turbine. Savonius water turbines have the advantage of otherturbines, namely installation in rivers that do not damage the environment, areable to work and do not require special maintenance as well as providingweaknesses that can affect the positive force and the negative force on the rotor isstill small. This turbine has never been widespread. To make this turbine it ispossible to conduct research to improve its performance, especially in the turbinerotor. In these words we will try the rattan turbine by varying the blade's turningangle from 00, 30o, 60o, 90o and 120o and adding ½ and ¼ opening flow guides.Based on the results of the research that we have done, we can say the differencein blade angle and flow guide to turbine performance. The variation of twist angleand flow controller that provides the most appropriate turbine performance is a90o swivel with turbine flow guide openings ¼. At the swivel angle 120o the waveguide is not as wide.

scholarly journals FISIKA KONTEKSTUAL PEMBANGKIT LISTRIK TENAGA MIKROHIDRO

2020 ◽  
Vol 6 (1) ◽  
pp. 142
Author(s):  
Richardo Barry Astro ◽  
Hamsa Doa ◽  
Hendro Hendro
Keyword(s):  
Kinetic Energy ◽  
Energy Conversion ◽  
Power Plants ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Impulse Turbine ◽  
Before And After ◽  
Water Turbine ◽  
Working Principle ◽  
Main Components

ABSTRAKPenelitian ini bertujuan untuk mengetahui prinsip dasar dan sistem kerja pembangkit listrik tenaga mikrohidro (PLTMH) dari sudut pandang fisika sebagai upaya penyediaan dan pengembangan sumber belajar kontekstual. Penelitian ini dilaksanakan menggunakan metode studi literatur, observasi, dan wawancara. Hasilnya ditemukan bahwa PLTMH memiliki tiga komponen utama yakni air sebagai sumber energi, turbin, dan generator. Skema konversi energi pada PLTMH yang menggunakan head adalah sebagai berikut: 1) energi potensial air dari reservoir diubah menjadi energi kinetik pada pipa pesat, 2) energi kinetik air diubah menjadi energi mekanik oleh turbin air, 3) energi mekanik diubah menjadi energi listrik oleh generator. Turbin air berdasarkan prinsip kerja dibagi atas turbin impuls dan turbin reaksi. Turbin impuls memanfaatkan perubahan momentum air sebelum dan setelah menabrak sudu turbin, sedangkan turbin reaksi memanfaatkan perbedaan tekanan pada permukaan sudu. Generator bekerja berdasarkan prinsip induksi elektromagnetik. Ketika rotor generator yang terkopel pada turbin berputar, kumparan konduktor akan memotong garis medan magnet sehingga timbul tegangan induksi. Kata kunci: pembangkit listrik tenaga mikrohidro; konversi energi; turbin, generator. ABSTRACTThe research aims to determine the fundamental principles and working systems of Microhydro power plants from a physical standpoint as an effort to provide and develop contextual learning resources. This study was conducted using literature, observation and interview methods. The results found that PLTMH had three main components i.e. water as energy source, turbine, and generator. The energy conversion scheme on PLTMH that uses the head is as follows: 1) The potential energy of water from the reservoir is converted into kinetic energy on the rapid pipeline, 2) water kinetic energy converted into mechanical energy by water turbine, 3) changed mechanical energy into electrical energy by generators. The water turbine based on the working principle is divided into impulse turbines and reaction turbines. The impulse turbine utilizes a change in water momentum before and after crashing the turbine's sudu, while the reaction turbine utilizes pressure differences on the surface of the Sudu. The generators work based on electromagnetic induction principles. When the rotor generator is attached to the turbine spinning, the conductor coil will cut off the magnetic field line so that the induction voltage arises. Keywords: microhydro power plant; energy conversion; turbine; generator.

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