... under variable flow and resistance loading conditions. engineering setoguchi sustainable development characteristic guide vane sustainability unsteady characteristic simulator test rig well turbine variation torque wave energy conversion ocean energy owc wave energy converter...

... Traditionally, Wells turbine has been widely used in OWC plants. However, an alternative has been studied during the last years, a selfrectifying turbine known as impulse turbine. We are interested in the radial version of the impulse turbine, which was initially proposed by M. McCormick...

... ABSTRACT This paper will assess the viability of small Wells turbines for oscillating water columns. The paper reports on a complete assessment of the integration of the system. It begins with a study using computational fluid dynamic analysis of a small double stage turbine. The analysis...

... ABSTRACT In this study, in order to enhance the performance of the Wells turbine for wave energy conversion, the effect of end plate on the turbine characteristics has been investigated experimentally by model testing under steady flow conditions. And then, the performances of the Wells...

... ABSTRACT In order to make clear the hysteresis behavior of biplane Wells turbine performance in deep stall condition, numerical investigations were made for the hysteretic characteristics in deep stall condition of biplane Wells Turbine. The numerical investigation was made by an unsteady...

... ABSTRACT The wave power generating system using the Wells turbine is installed in the breakwater in Sakata port, Japan, and consists of the air chamber, turbine, generator and safety devices. The purposes of this paper are to reveal the characteristics of each component in this system...

... ABSTRACT The aim of this study is to clarify the effect of rotor blade profile on the performance of the Wells turbine operated at high Reynolds number. In the study, four kinds of blade profile were selected with regard to the blade profile of the Wells turbine. The experimental...

... ABSTRACT In order to make clear the hysteresis behavior of Wells turbine performance including deep stall condition, experimental and numerical investigations were made for the hysteretic characteristics including deep stall condition of Wells Turbine. The experimental investigation was made...

... a self-rectifying air turbine such as a Wells turbine which was introduced by Dr. A. A. Wells in 1976. This turbine rotates in a single direction in oscillating airflow and therefore does not require a system of non-return valves. Many reports describe the performance of the Wells turbine both at running...

... ABSTRACT The paper presents the effect of rotor geometry on the performance of a small-scale Wells turbine. In the study, four kinds of blade profile were selected with regard to the blade profile of the Wells turbine. The types of blade profile are as follows: NACA0020; NACA0015; CA9...

... OWC designs to date have employed a fixed-pitch Wells turbine (eg. Raghunathan et al., 1995; Washio et al., 2000). Extensive research has also been conducted on self-rectifying impulse turbines (eg. Santhakumar et al., 1998; Setoguchi et al. 2001). One method of improving turbine performance...

... water column (OWC) generated by the ocean waves. In 1976, Dr. A. A. Wells proposed a form of self-rectifying, axialflow air turbine, the Wells turbine, as a device suitable for wave energy conversion utilizing OWC. The performance of the Wells turbine has been studied in the United Kingdom, Japan...

... chamber that converts wave energy into oscillating airflow (Raghunathan, 1995; Washio et al., 2000). A Wells type turbine is used for the air turbine because it is suitable for the operation in oscillating airflow. The Wells turbine will always rotate in the same direction irrespective of the direction...

... analysis for Wells turbine which is one of axial flow turbine has been performed by Watterson. However numerical analysis for cross flow turbine has not been done. Author's aim is to simulate the ducted turbine for alternating flow by 3 dimensional Navier-Stokes analysis and obtain the relation between...

..., it is found that the air turbine with staggered blades is superior to the Wells turbine, and a suitable choice of design factor has been suggested for the preset angle of the rotor. INTRODUCTION A Wells turbine is a self-rectifying air turbine which is expected to be widely used in wave energy devices...

... ABSTRACT A Wells turbine blade for wave power conversion has hysteretic characteristics in a reciprocating flow. The hysteretic loop is opposite to the well-known dynamic stall of an airfoil. In this paper, the mechanism of the hysteretic behavior was elucidated by an unsteady 3- dimensional...

... ABSTRACT The aerodynamic characteristics of Wells turbine, which operates in unsteady state like a sinusoidal flow condition, are investigated to reproduce the hysteretic characteristics. The pressure distributions on the suction surface of the blade are investigated to find the cause...

... ABSTRACT This paper presents a comparison of 0.6m Impulse and Wells turbines with same hub to tip ratio of 0.6 for wave energy power conversion under similar conditions. A 0.6m Wells turbine rotor with a solidity of 0.6, with guide vanes, was tested in a 0.6m test rig. Similarly, an Impulse...

... ABSTRACT This paper presents a methodology for numerical simulation of a CA9 rotor Wells turbine. The work was carried out for a turbine size of 0.6m in diameter and computation were done at Re = 5 × 10 s, Ma = 0.2 and solidity of 0.48 (6 blades) over a range of flow rates. The aim...

... have been performed under steady flow conditions in this study. As a result, it is found that the noise characteristics of the impulse type turbines are superior to the Wells type turbines. INTRODUCTION The Wells turbine is a self-rectifying air turbine which is expected to be widely used in wave...