Influence of blade profiles on Savonius rotor performance: Numerical simulation and experimental validation

Four Decades of Research Into the Augmentation Techniques of Savonius Wind Turbine Rotor

The blade profiles and blade shapes of vertical-axis Savonius wind turbine rotors have undergone a series of changes over the past three decades. Wind turbine aerodynamicists have carried out numerous computational and experimental research to arrive at a suitable rotor blade design configuration so as to harvest maximum energy from the available wind. In most of the studies, the geometric and aerodynamic aspects of the rotor blade design have been reported. Interestingly enough, a couple of review papers got published in the area of Savonius rotors during the last one decade. However, there is not a single piece of literature that gives a comprehensive and a systematic review of Savonius rotor blade profiles and shapes. This paper aims to collate all the research findings related to these blade profiles/shapes and makes an attempt to highlight their features together with future recommendations.

Evolution and Progress in the Development of Savonius Wind Turbine Rotor Blades Profiles and Shapes

The following work represents the most recent advances in design and testing of vertical axis wind turbines (VAWT) rotors. VAWTs have received much attention as of late due to proposed advantages in small scale and off grid wind power generation. Thus, many recent works have surfaced involving analysis, design and optimization of VAWT rotors in order to more efficiently convert wind energy to electricity or other readily usable means. This paper is a collection of most of the recent literature works involving VAWT rotor design and testing, the majority of which published after 2005. We discuss research in the designing of various lift based rotors as well as some drag based rotors, hybrids, and various others. The recent work in this area suggests VAWT capacity could dramatically increase in the near future, and play a vital role in obtaining cleaner, more sustainable energy when global energy demand is increasing at an unprecedented rate.HIGHLIGHTS• A review of various works involving rotor design and te...

Recent Advances in Rotor Design of Vertical Axis Wind Turbines

This paper bequeaths particulars of impact of turbulence on the flicker produced in the wind turbine which is sited on that surface. This is achieved in a laboratory wind tunnel with small models of hills with different slopes and wind turbine. Different shapes of models of hills placed in a laboratory wind tunnel. Wind turbines are tested for those conditions. The paper provides an empirical model to find flicker in terms of hill topography. The exquisiteness of the model is that, it is expedient to sundry types hills on which the turbine is sited. Validation of model is carried out with comparative graphs revealed with readings recorded on a turbine in tunnel.

Assessment of flicker owing to turbulence in a wind turbine placed on a hill using wind tunnel

Wind energy is a renewable energy without pollution in the nature world. Researchers dedicate to improve wind energy utilization of vertical axis wind turbine (VAWT). A new type of wind rotor named fish-ridged rotor is proposed based on bionic simulation of swimming fish. Geometric structure of the rotor is designed and analyzed. Wind tunnel tests are carried out to study performance of the rotor. Influence of key structural parameters of the rotor on its performance is simulated and analyzed by computational fluid dynamics (CFD). Results show that the new type of the rotor has good performance and has simple structure.

Performance and structure optimization for a new type of vertical axis wind turbine

As a renewable energy, wind energy has attracted great attention all over the world. To study the aerodynamic performance of new vertical axis wind energy conversion systems, a type of simple straight-flow wind tunnel test equipment for vertical axis wind turbines has been developed. The performance of the power section, diffusing section, rectification section and the contraction section of the wind tunnel is analyzed and calculated, and an integrated test bed is established, with which, the performance of a new wind wheel is tested and analyzed. The results show that the test equipment is simple structured, convenient to manufactured, reliable to operate, and able to get a stepless speed regulation of the wind speed with 0.5–15m/s, which also provides corresponding design parameters for the permanent magnetic generators matched.

http://ieeexplore.ieee.org/iel5/6016074/6024900/06025023.pdf

Research and development of a simple straight-flow wind tunnel test equipment for vertical axis wind turbines

The invention discloses a lift-to-drag blending wing plate type vertical axis wind wheel, comprising a rotating shaft and a plurality of blades which are distributed along the periphery and take the rotating shaft as the center. Each blade is a lift-to-drag blending wing plate which is formed by integrally blending a lift convex surface and a resistance concave surface, and the combining part of the convex surface and the concave surface of the blade is provided with transition arc cylinder surfaces which can be matched mutually. The wind wheel combines the characteristics of drag and lift of the wind power utilization, has the advantages of low starting wind speed, fast speed increasing, high wind energy use ratio, low cost and the like, and is reliable in operation.

Lift-to-drag blending wing plate type vertical axis wind wheel

The utility model discloses a simple wind tunnel test device of a wind wheel of a vertical shaft type wind driven generator The device mainly consists of a wind tunnel main body and a wind wheel test table which is arranged at an outlet end of the wind tunnel main body, wherein the wind wheel test table comprises a base seat which is fixedly arranged, the base seat is rotatablely provided with an installing platform for a vertical shaft wind wheel, the installing platform is provided with a belt wheel which is coaxially linked with the vertical shaft wind wheel, the belt wheel is wound with a belt, and the two ends of the belt are respectively connected with two dynamometers which are fixedly connected with the base seat The simple wind tunnel test device is simple in structure, convenient to manufacture and low in cost, can simulate the work condition of the practical wind field, can reduce the constructing cost by about tens of times compared with the existing wind tunnel device for aviation, can offer optimized test performance parameters to the design of the wind wheel of the vertical shaft wind driven generator, and can offer corresponding design parameters to the matched wind driven generator

Simple wind tunnel test device of wind wheel of vertical shaft wind driven generator

Wind energy is a clear, safe and renewable green energy resource. Because it can be supplied inexhaustibly and always be used availably, it is exploited by countries all over the world and has gradually become a new energy type. According to the wind energy characteristics and the hydrodynamics theory, the vertical axial wind turbine of three hastate windmill, which can convey the intra-cavity wind energy, is developed in this paper. The power principles of permanent magnet is used to construct the technique of the speed loss and controlled wind power generation which is coaxial with the wind turbine of three hastate windmill. The experimental results show that this invention has many advantages such as simple structure, high utilization efficiency of wind energy, low startup wind speed, high equipment reliability and good maintainability. This invention has broad application prospect in the market with great economic value, and profound social significance on the environment-friendly green energy industries of China and even the whole world.

Rui-Tao Deng

Papers

Performance and structure optimization for a new type of vertical axis wind turbine

Research and development of a simple straight-flow wind tunnel test equipment for vertical axis wind turbines

Lift-to-drag blending wing plate type vertical axis wind wheel

Simple wind tunnel test device of wind wheel of vertical shaft wind driven generator

Development of vertical axial wind turbine driven by three hastate windmill and permanent magnet generator