CLC number: TK7

On-line Access: 2013-01-02

Received: 2012-06-04

Revision Accepted: 2012-10-24

Crosschecked: 2012-12-10

Cited: 0

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Ji-feng Wang, Janusz Piechna, Norbert Mller. Numerical investigation of the power generation of a ducted composite material marine current turbine[J]. Journal of Zhejiang University Science A, 2013, 14(1): 25-30.

@article{title="Numerical investigation of the power generation of a ducted composite material marine current turbine",

author="Ji-feng Wang, Janusz Piechna, Norbert Mller",

journal="Journal of Zhejiang University Science A",

volume="14",

number="1",

pages="25-30",

year="2013",

publisher="Zhejiang University Press & Springer",

doi="10.1631/jzus.A1200139"

}

%0 Journal Article

%T Numerical investigation of the power generation of a ducted composite material marine current turbine

%A Ji-feng Wang

%A Janusz Piechna

%A Norbert Mller

%J Journal of Zhejiang University SCIENCE A

%V 14

%N 1

%P 25-30

%@ 1673-565X

%D 2013

%I Zhejiang University Press & Springer

%DOI 10.1631/jzus.A1200139

TY - JOUR

T1 - Numerical investigation of the power generation of a ducted composite material marine current turbine

A1 - Ji-feng Wang

A1 - Janusz Piechna

A1 - Norbert Mller

J0 - Journal of Zhejiang University Science A

VL - 14

IS - 1

SP - 25

EP - 30

%@ 1673-565X

Y1 - 2013

PB - Zhejiang University Press & Springer

ER -

DOI - 10.1631/jzus.A1200139

**Abstract: **In the hostile and highly corrosive marine environment, advanced composite materials can be used in marine current turbines due to their high strength-to-weight ratios and excellent resistance to corrosion. A composite material marine current turbine (CMMCT), which has significant advantages over traditional designs, has been developed and investigated numerically. A substantial improvement in turbine performance is achieved by placement of a duct to concentrate the energy. computational fluid dynamics (CFD) results show that the extracted power of a ducted CMMCT can be three to four times the power extracted by a bare turbine of the same turbine area. The results provide an insight into the hydrodynamic design and operation of a CMMCT used to shorten the design period and improve technical performance.

**
**

1. Introduction

In this study, a numerical approach was performed using computational fluid dynamics (CFD) in a free stream of water to examine the performance of a bare and a ducted CMMCT. Two main characteristics, static torque and extracted power, of these two types of turbines, were calculated and compared at different rotation speeds in a free stream with various hydrodynamic flow conditions.

2. Numerical method and computational modeling

For the computational domain, unstructured 3D tetrahedral meshing was employed due to its flexibility when solving geometries (Fig.

CFD is based fundamentally on the governing equations of fluid dynamics. They represent mathematical statements of the conservation laws of physics, where the following physical laws are adopted (Wang et al.,

1. Mass is conserved for the incompressible fluid at steady state as

2. For the fluid analysis of the entire turbine at steady state, the incompressible Navier-Stokes equations were used in the following form:

The standard

3. Results and discussion

Cavitation occurs when the absolute value of the local pressure coefficient on the blades,

The simulation results for extracted torque and power for a CMMCT and a ducted CMMCT in various hydrodynamic flow conditions, at water flow speeds of 3 m/s, 4 m/s, 5 m/s and 6.17 m/s were simulated according to the available capability of the experimental system used for testing. Fig.

From Euler’s equation, the turbine’s extracted power is given by the multiplication of the extracted torque and the rotation speed (Dixon,

4. Conclusions

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