Dynamic Analysis of a Truss Spar-Type Floating Foundation for 5 MW Vertical-Axis Wind Turbine

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Liqin Liu ◽  
Weichen Jin ◽  
Ying Guo
Keyword(s):  
Wind Turbine ◽  
Structural Parameters ◽  
Vertical Axis ◽  
Rotational Frequency ◽  
Wave Loads ◽  
Vertical Axis Wind Turbine ◽  
Mean Values ◽  
Floating Foundation ◽  
Truss Spar ◽  
Foundation Parameters

This paper studies the dynamic characteristic of the truss Spar-type floating foundation used to support the offshore vertical-axis wind turbine (VAWT). The effects of changes in foundation structural parameters on its motions were evaluated. The results show that radius of the buoyancy tank, radius of the upper mechanical tank, interval of the center of gravity and center of buoyancy, and height of the upper mechanical tank have important effects on the heave and pitch motions of the foundation. Two sets of foundation parameters (FS-1 and FS-2) were selected to support the 5 MW Darrieus wind turbine. The motion performances of the two floating VAWTs, S-1 (the VAWT supported by FS-1) and S-2 (the VAWT supported by FS-2), were analyzed and compared. It was observed that the amplitudes of the heave and pitch motions of the floating VAWT depend on the wave loads; the mean values of the heave and pitch motions depend on the aerodynamic loads. The floating VAWT S-2 had better motion performance; its heave and pitch motions were all small. The heave frequencies of the floating VAWT were equal to the wave frequencies. For the pitch frequencies, there is a component of the rotor rotational frequency (0.175 Hz) for cases LC1 to LC4, while the amplitudes of the twice-per-revolution (2P) response are far smaller than the amplitudes of the wave response.

Motion Performances of a 5 MW VAWT Supported by Spar Floating Foundation With Heave Plates

2017 ◽  
Author(s):  
Liqin Liu ◽  
Ying Guo ◽  
Weichen Jin ◽  
Rui Yuan
Keyword(s):  
Wind Turbine ◽  
Large Scale ◽  
Vertical Axis ◽  
Offshore Wind ◽  
Vertical Axis Wind Turbine ◽  
Motion Equations ◽  
Offshore Wind Power ◽  
Floating Foundation ◽  
Motion Study ◽  
Truss Spar

The VAWT (vertical axis wind turbine) has advantages in the development of large-scale offshore wind power. This paper presents a motion study of a 5 MW floating VAWT composed of the Φ type Darrieus wind turbine and a truss spar floating foundation with heave plates. The surge, heave and pitch motion equations considering the effects of retardation function of the floating VAWT were established and solved numerically. Several load cases were carried out to analyze the motion performances of the floating VAWT. The results show that the wind forces have minimal influence on the heave motions of the floating VAWT, while they obviously increase its surge and pitch mean displacements. For LC3, the surge, heave and pitch frequencies of the floating VAWT are dominated by the wave frequencies, and the 2P (twice-per-revolution) response of pitch motions is not significant. For LC4, the 2P response of pitch motions of the floating VAWT are more significant than LC4.

The Aerodynamic Analysis of Helical-Type VAWT With Semi Empirical and CFD Method

2019 ◽  
Author(s):  
Ying Guo ◽  
Liqin Liu ◽  
Xinxin Lv ◽  
Yougang Tang
Keyword(s):  
Wind Turbine ◽  
Output Power ◽  
Structural Parameters ◽  
Vertical Axis ◽  
Empirical Method ◽  
Parameter Analysis ◽  
Vertical Axis Wind Turbine ◽  
Parameters Analysis ◽  
Cfd Method ◽  
Semi Empirical

Abstract Comparing to Φ-type and H-type VAWT (Vertical Axis Wind Turbine), the amplitude changes of the aerodynamics acting on Helical-type VAWT are much smaller, so Helical-type VAWT has advantages in steady output power and avoiding fatigue of structure. Considering the characteristic of helical-type VAWT, this paper modifies the semi empirical method of calculating aerodynamic loads and compares with CFD results. A comparison is presented between CFD results and experiment results to confirm the model used in CFD. Single parameter analysis and muti-parameters analysis are carried out to study the influence of structural parameters on the dynamic torque. Based on an objective output power as 5MW, the parameters of wind turbine are adjusted, and optimal values of these parameters are determined.

A Review on the New Structure of Savonius Wind Turbines

2012 ◽  
Vol 608-609 ◽  
pp. 467-478 ◽  
Author(s):  
Zhi Peng Tang ◽  
Ying Xue Yao ◽  
Liang Zhou ◽  
Bo Wen Yu
Keyword(s):  
Wind Turbine ◽  
Structural Parameters ◽  
Vertical Axis ◽  
Low Noise ◽  
Energy Utilization ◽  
Vertical Axis Wind Turbine ◽  
Tidal Power ◽  
Useful Knowledge ◽  
Structural Improvement ◽  
Savonius Wind Turbine

This paper summarizes the research results of the structural parameters which have effects on the performance of Savonius wind turbine. Savonius wind turbine being used in wind power and tidal power belongs to vertical axis wind turbine (VAWT). Recently, more and more research have placed on it for its advantages such as: being able to accept wind from any direction, long fatigue life of the blades, high starting torque, wide working wind speed range, easy to install, manufacture and maintain and low noise etc. The performance of Savonius wind turbine is affected by many factors. Different structural parameters can bring huge differences in turbine performance. Especially the differences in the maximum wind energy utilization (Cp-max) can be more than 30% with different structure. Many new turbines get higher Cp-max by improving the structural parameters. In this paper, the structural improvement information of Savonius wind turbine is summarized in order to provide useful knowledge for the researchers in the structural design and improvement.

scholarly journals Orthogonal Analysis Based Performance Optimization for Vertical Axis Wind Turbine

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Lei Song ◽  
Hong-Zhao Liu ◽  
Zong-Xiao Yang
Keyword(s):  
Wind Turbine ◽  
Performance Optimization ◽  
Structural Parameters ◽  
Vertical Axis ◽  
Optimization Method ◽  
Energy Utilization ◽  
Geometrical Shape ◽  
Vertical Axis Wind Turbine ◽  
Traditional Research ◽  
Orthogonal Analysis

Geometrical shape of a vertical axis wind turbine (VAWT) is composed of multiple structural parameters. Since there are interactions among the structural parameters, traditional research approaches, which usually focus on one parameter at a time, cannot obtain performance of the wind turbine accurately. In order to exploit overall effect of a novel VAWT, we firstly use a single parameter optimization method to obtain optimal values of the structural parameters, respectively, by Computational Fluid Dynamics (CFD) method; based on the results, we then use an orthogonal analysis method to investigate the influence of interactions of the structural parameters on performance of the wind turbine and to obtain optimization combination of the structural parameters considering the interactions. Results of analysis of variance indicate that interactions among the structural parameters have influence on performance of the wind turbine, and optimization results based on orthogonal analysis have higher wind energy utilization than that of traditional research approaches.

Study on the Hydrodynamic Characteristic of a Spar Type Floating Foundation Which Used to Support a Vertical Axis Wind Turbine

2016 ◽  
Author(s):  
Liqin Liu ◽  
Xiaorui Zhang ◽  
Ying Guo ◽  
Yu Qiu
Keyword(s):  
Wind Turbine ◽  
Large Scale ◽  
Hydrodynamic Characteristic ◽  
Vertical Axis ◽  
Offshore Wind ◽  
Initial Structure ◽  
Vertical Axis Wind Turbine ◽  
Natural Period ◽  
Ballast Tank ◽  
Floating Foundation

The vertical axis wind turbine has more advantages in the development of the large-scale offshore wind power, on account of that its drive system is placed on the bottom of the turbine and has little influence on the tower. This paper presents a preliminary design of a Spar foundation, which can support a Darrieus vertical axis wind turbine with a generated power of 5 MW. The influences of structure’s parameters of the floating foundation, such as the radius of flotation tank, the radius and height of upper ballast tank, the height of bottom ballast tank and other factors on the motions of the floating wind turbine system are analyzed. The initial structure parameters of the floating foundation are determined, and the hydrodynamic parameters are calculated as well. It is found that the radius of floatation tank and bottom ballast tank have more impact on the Response Amplitude Operators (RAOs) and natural period of heave of the floating foundation. The interval of center of gravity and center of buoyancy and the height of upper ballast tank influence obviously on the RAOs and natural period of pitch of the floating foundation. Heave and pitch motions of the floating foundation designed here are relatively small. The natural periods of heave and pitch of the floating foundation are away from the main wave energy periods.

Calculating the aerodynamics of vertical axis wind turbines

2012 ◽  
Vol 34 (3) ◽  
pp. 169-184 ◽  
Author(s):  
Hoang Thi Bich Ngoc
Keyword(s):  
Wind Turbine ◽  
Incidence Angle ◽  
Vertical Axis ◽  
Rotor Blades ◽  
Vertical Axis Wind Turbine ◽  
Horizontal Axis Wind Turbine ◽  
Velocity Triangle ◽  
Relationship Of ◽  
The Relationship

Vertical axis wind turbine technology has been applied last years, very long after horizontal axis wind turbine technology. Aerodynamic problems of vertical axis wind machines are discussible. An important problem is the determination of the incidence law in the interaction between wind and rotor blades. The focus of the work is to establish equations of the incidence depending on the blade azimuth, and to solve them. From these results, aerodynamic torques and power can be calculated. The incidence angle is a parameter of velocity triangle, and both the factors depend not only on the blade azimuth but also on the ratio of rotational speed and horizontal speed. The built computational program allows theoretically selecting the relationship of geometric parameters of wind turbine in accordance with requirements on power, wind speed and installation conditions.

Design and Analysis of Vertical Axis Wind Turbine

2017 ◽  
Author(s):  
Prof. R.K. Bhoyar ◽  
Prof. S.J. Bhadang ◽  
Prof. N.Z. Adakane ◽  
Prof. N.D. Pachkawade
Keyword(s):  
Wind Turbine ◽  
Vertical Axis ◽  
Vertical Axis Wind Turbine
Sign in / Sign up

Export Citation Format

Share Document