... 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...

... geometry design with a better performance. Under sinusoidal flow conditions the new design improves the turbine´s efficiency around 5% more than the geometry proposed by (Setoguchi, Santhakumar, Takao, & Kaneko, 2002). In this paper we will describe the flow behaviour and the performance of this new...

... The tip clearance plays a fundamental role in the flow pattern inside a turbine. Improving the knowledge about the phenomena related with the tip clearance and evaluating its influence on the turbine´s performance are the main purposes of this work. The geometry proposed in (Setoguchi...

... with conventional turbines: lower efficiency and poorer starting characteristic. Some researchers have suggested measures in order to overcome the drawbacks above. According to previous studies, the postponement of stall can be achieved by setting guide vanes (Setoguchi et al., 1998a) or porous fences (Setoguchi et...

.... These numerical approaches adopted Reynolds-averaged Navier-Stokes' (RANS) equations, while the LES calculation may provide information on different aspects especially for unsteady fully separating flow (Setoguchi et al., 2004). The main idea of the proposed end plate was to minimize the adverse effect of tip...

... that the turbine can be operated with higher turbine efficiency and lower rotational speed than the Wells turbine (Setoguchi et al., 2001). flow condition coefficient turbine impulse turbine quasi-steady analysis sinusoidal flow condition setoguchi renewable energy sustainability tip clearance...

...-type radial turbines were not found in the literature. In an attempt to fill this gap, performance characteristics were measured on turbines (508.8 mm rotor diameter) with different guide vane geometries by the authors (Setoguchi et al., 2002; Takao et al., 2002). Performance was also measured for flow...

... oscillating air flow. A lot of researches have been made for the Wells turbine and it has been found that the Wells turbine has hysteretic characteristics in an unsteady flow in unstalled condition (Inoue et al. (1987), Setoguchi et al. (1990) and Alcorn&Beattie (1998). These hysteretic characteristics...

... the performance of the Wells turbine, some rotor blade profiles have been recommended by various researchers. It has been found by Setoguchi et al. (2003) that the optimum blade profile for small-scale Wells turbine which is installed in small wave energy device such as the navigation buoy (Setoguchi and Takao...

...-rectifying air turbine as a secondary one (Fig.1). A lot of researches have been made for the Wells turbine, and it has been found that the Wells turbine has hysteretic characteristics in an unsteady flow in unstalled condition (Inoue et al. (1987), Setoguchi et al. (1990) and Alcorn & Beattie (1998...

... the validity of two-dimensional approach. Results were compared to other experimental data, for instance Setoguchi et al (2001)''s extensive set of data, and found to be well demonstrating the usefulness of 2-D analysis. Advantages and disadvantages of each method were also evaluated. INTRODUCTION Because...

.... guide vane turbine characteristic wave energy conversion well turbine sustainability sustainable development hub-to-tip ratio reynolds number ocean energy diameter engg conf impulse turbine social responsibility kaneko wave power conversion turbine conversion setoguchi wert renewable...

... energy may be achieved by a number of devices. The representative wave energy converter using the principle of OWC is the navigational light-buoy invented in Japan (Setoguchi and Takao, 2001). More than one thousand navigation buoys have been produced since 1965 and marketed worldwide. Some of them have...

..., Ireland and other countries (moue et al., 1986a, 1986b, 1988; Raghunathan and Tan, 1982; Setoguchi et al., 1998; White, 1995). According to these results, the Wells turbine has inherent disadvantages: lower efficiency, poorer starting torque, higher noise level and higher axial thrust in comparison...

... coefficient social responsibility variation impulse turbine turbine characteristic modeling & simulation conversion efficiency setoguchi flow condition reservoir simulation ocean energy rpm sustainable development unsteady flow condition guide vane real sea condition de iq A. R...

... characteristic social responsibility sinusoidally rotor blade energy conversion sustainability guide vane rotational speed ocean energy efficiency setoguchi flow condition sustainable development inner guide vane Performance of a Radial Turbine for Wave Power Conversion M. Takao and K. Itakura...

... with oscillating water column (OWC). There are many reports which describe the performance of the Wells turbine both at starting and running characteristics (Gato and Falcão, 1988; Inoue et al., 1986a, 1986b, 1988; Raghunathan and Tan, 1982; Setoguchi et al., 1998; White, 1995). According to these results...

... characteristics of Wells turbine by a quasisteady analysis. However, it results in inaccurate predictions of the performance, as the Wells turbine has a hysteretic behavior in an unsteady flow (Setoguchi et al., 1990; Alcorn and Beattie, 1998). Dynamic stall phenomena are well-known as an unsteady aerodynamics...

... simple structure at present. In early researches, the design data and estimation of capacity of Wells turbine were obtaiwd by the model turbine tests under steady flaw state. However, Setoguchi et al. (1998) reported the importance of unsteady flow characteristics. The hysteresis characteristic...

... development efficiency setoguchi university impulse turbine wave power conversion renewable energy conversion flow condition proceedings offshore well turbine rotor coefficient Proceedings of the Eleventh (2001) hlternational Offshore and Polar Engineering Conference Stavanger, Norway, June 17...