A novel design of composite water turbine using CFD (original) (raw)

Numerical investigation on composite material marine current turbine using CFD

A novel manufacturing approach similar to filament winding has been developed and automated and is able to produce the Composite Material Marine Current Turbines (CMMCT), which have significant advantages over traditional designs. This paper presents numerical results to investigate the performance of these turbines. The numerical approach was performed using Computational Fluid Dynamics (CFD) in a free stream of water with various hydrodynamic flow conditions. Static torque, extracted power and power coefficient were calculated at different rotating speeds in a free stream with various hydrodynamics flow conditions. The power coefficient of CMMCT was compared to that of traditional current turbines. The calculated results will provide a fundamental understanding of the impeller as a water turbine, and this design method is used to shorten the design process and improve the water turbine’s performance.

Performance Analysis of Diffuser-Augmented Composite Marine Current Turbine Using CFD

2011

ABSTRACT A wound composite material wheel has been developed and is intended to be used for many purposes. One of these applications is marine current turbine. Diffuser-augmented turbines are capable of concentrating the energy in water. If a diffuser shaped shroud encloses a conventional horizontal axis turbine, the low pressure at the exit of the diffuser draws a larger mass flow through the turbine. This permits more power to be extracted from the water.

Optimization and Simulation of Hydro-Turbine Nozzle in Based on Ansys Analysis

This paper presents Optimization and Simulation of hydro-turbine nozzle in based on ansys analysis. Based on three-dimensional numerical flow analysis, the flow characteristics through the water turbine with nozzle are predicted. The Pressure and Velocity distribution of hydro-turbine nozzle is different points were calculated and analyzed for a Structural analysis and CFD analysis. The simulation results show that using nozzle can increase the pressure drop across the turbine and extract more power from available water energy. These results provide a fundamental understanding of the composite water turbine, and this design and analysis method is used in the design process.

The CFD-Based Simulation of a Horizontal Axis Micro Water Turbine

2021

A horizontal axis micro water turbine generator has been designed for use as a source of power generation where the reservoir construction has only a low head. It uses the natural flow rate of water to generate a specific power output. The power is, however, limited by the flow rate of water which has to be sufficient to keep operating a suitable number of revolutions per minute for the blades. Tis research aimed to introduce a new blade can be disassembled and modular on the wheel blade and developing for optimum design of the horizontal axis micro water turbine generator. A 3D model of the wheel blade in the horizontal axis micro water turbine generator was created by using Autodesk Inventor Professional 2018 software. Computational Fluid Dynamics (CFD) analysis and structural Finite Element Analysis (FEA) are presented in this paper. CFD analysis was performed to obtain the velocity and pressure difference between the concave and convex regions of the wheel blade while FEA was us...

Performance improvement of a novel combined water turbine

Energy Conversion and Management, 2020

Nowadays, industrials and researchers are looking for renewable energy resources due to the increase of energy demand. Recently, the ability of combined turbines in harnessing energy from water current has increased their renewed interest. However, there still exist a big knowledge gap to select the optimal design of these turbines. In this paper, systematic studies of stand-alone helical Savonius and delta bladed Darrieus turbines were carried out using experimental methods as a precursor to analyze their roles in hybrid configuration. By varying the attachment angle, two hybrid configurations were tested experimentally. Using the optimal attachment angle, six hybrid configurations were investigated numerically based on the commercial software ANSYS FLUENT 17.0. From one configuration to another, only the design of the Savonius turbine was changed. The maximum power coefficient is found to be equal to 0.191 at tip-speed ratio of 0.63 using a helical bladed Savonius turbine with twist angle of 90°. However, the maximum power coefficient reaches 0.232 using a delta bladed Savonius turbine with the same twist angle. This optimization of the novel combined water turbine could be a solution to enhance the generated power.

A novel design and preliminary investigation of composite material marine current turbine

A high performance and light-weight wound composite material wheel has been developed and is intended to be used for many purposes. One of these applications is marine current turbine (MCT). Traditionally, major problems influencing the design and operation of MCTs are fatigue, cavitation and corrosion due to the sea water. Considering these factors, implementation of composite materials, especially Kevlar fiber/epoxy matrix, in MCTs is explained in this paper. This novel design pattern of composite material marine current turbine (CMMCT) shows many advantages compared to conventional turbines. This paper investigated several factors which should be considered during this novel turbine design process such as the composite material selection, filament winding of composite wheel and turbine’s structural and cavitation analysis. The power coefficient of CMMCT by using CFD is also obtained and the experimental facilities for testing CMMCT in a water towing tank are briefly described.

Design, Fabrication and Performance Test of Axial Flow Hydro Turbine

International Journal of Advances in Scientific Research and Engineering (ijasre), 2019

Hydropower is the source of renewable energy for more than a century leading to a decrease in the burning of fossil fuels which has an effect on the environment. The axial flow hydro turbine is placed for a small water flow rate and the low head application. Axial flow hydro turbine consists of guide vane mounted in the stationary casing and blades connected on the hub. Axial flow hydro turbine consists of four runner blades, the number of guide vane is 6 and the guide vane angle is 73˚. In this research, the available head and flow rate are 3.4 m and 0.14 m3/sec. Hydrofoil shape of runner blade selected NACA 6412 and modeling the blade geometry used SolidWorks software. In this research, the modal of the axial flow hydro turbine is made with thermoplastic filament material due to produce easily. The turbine assembly was tested with various water velocities at Lon Town Irrigation Channel in Madayar Township, Myanmar. Experimental results of turbine shaft power and generator output power are also estimated in this research. The maximum turbine shaft power and generator output power are observed 3.66 kW and 3 kW at volume flow rate of 0.15 m3/s.

A design methodology for cross flow water turbines

Renewable Energy, 2010

This contribution deals with the design of cross flow water turbines. The mechanical stress sustained by the blades depends on the basic geometrical specifications of the cross flow water turbine, its rotational speed, the exact geometry of the blades and the velocity of the upstream water current. During the operation, the blades are submitted to severe cyclic loadings generated by pressure field's variation as function of angular position. This paper proposes a simplified design methodology for structural analysis of cross flow water turbine blades, with quite low computational time. A new trapezoidal-bladed turbine obtained from this method promises to be more efficient than the classical designs. Its most distinctive characteristic is a variable profiled cross-section area, which should significantly reduce the intensity of cyclic loadings in the material and improve the turbine's durability. The advantages of this new geometry will be compared with three other geometries based on NACA0018 hydrofoil.

Experimental and Numerical Studies on the Influence of Blade Number in a Small Water Turbine

Energies

This paper demonstrates the procedure of blade adjustment in a Kaplan-type water turbine, based on calculations of the flow system. The geometrical adjustment of a twisted blade with varying chord length is described in the study. Computational fluid dynamics (CFD) analysis was used to characterise aerofoil and turbine performance. Furthermore, two turbines, with a different number of blades, were designed, manufactured, and tested experimentally. The numerical model results were then compared with the experimental data. The studies were carried out with different rotational velocities and different stator blade incidence angles. The paper shows a comparison of the turbine efficiencies that were assessed, using numerical and experimental methods, of a flow system with four- and five-bladed rotors. The numerical model results matched up well with those of the experimental study. The efficiency of the proposed turbines reached up to 72% and 84% for four-bladed and five-bladed designs,...

Investigation the Performance of Stream Water Wheel Turbines using CFD Techniques

2018

A stream water wheel is a machine for converting the energy of moving water into power. It consists of a large metal wheel, with a number blades arranged on the outer rim which allows the wheel to be rotated by the water striking the blades. Water wheels were used since ancient as a primary source of power. It was used for irrigation, grain milling and supplying villages with water. In the present study, a stream water wheel turbine of 5 m in diameter is numerically simulated using ANSYS-CFX package under different flow conditions. The wake region behind the turbine is monitored where it influences on other turbines next to it. The simulation results have shown that in case of constructing a farm of wheel turbines, the streamwise span should not be less than 6 m. The stream wheel turbines works normally at a tip speed ratio TSR less than unity.