The objective of this paper is to report the effects of Reynolds number and hub-to-tip ratio on the performance of the impulse turbine for wave energy conversion. The turbine was investigated experimentally under steady and sinusoidally oscillating flow conditions by model testing. As a result, it was found that the critical value of Reynolds number and the optimum hub-to-tip ratio are approximately 4.0× 104 and 0.7, respectively. Furthermore, their effect on starting characteristics have been clarified. © 2004 by ASME.

Sundarm Moses Santhakumar

MATHEMATICAL INSTRUMENTS

Reynolds number

WAVE POWER

IMPULSE TURBINES

Model testing

OFFSHORE STRUCTURES

turbine

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Study of an Impulse Turbine for Wave Power Conversion: Effects of Reynolds Number and Hub-to-Tip Ratio on Performance

Journal of Offshore Mechanics and Arctic Engineering

A bidirectional axial-flow impulse turbine installed in an oscillating water column raises the question of damping at different wave conditions. This article reports unsteady performances of such a turbine in an airflow test rig. The rig has a piston-cylinder arrangement, and the piston, when reciprocating, generates the oscillatory airflow. At a very low wave height (piston stroke length, <0.4 m), the turbine speed is very low. Time series analysis of pressure drop and speed are reported for higher stroke lengths, which shows the rate of increase and decrease in velocity of the turbine. Furthermore, the turbine pressure coefficient and the damping characteristics of the test rig chamber were estimated. Finally, the chamber damping verifies that the turbine-chamber coupling effect is reciprocal. © 2018 John Wiley & Sons, Ltd.

International Journal of Energy Research

Experimental analysis of turbine-chamber coupling for wave energy conversion

Oscillating Water Column based wave energy plants convert wave energy into low pressure pnuematic power in the form of bi-directional air flows. Air turbines which are capable of rotating uni-directionally in bi-directional air flow, otherwise also known as self-rectifying turbines, are used to extract mechanical shaft power which is further converted into electrical power by a generator. This paper reviews the state of the art in self-rectifying impulse air turbines. New results on optimum parameters for the fixed-guide-vane impulse turbine are also presented. Starting characteristics and conversion efficiencies of two types of impulse turbines are compared with the well known Wells turbine. © 2001 Elsevier Science Ltd. All rights reserved.

Renewable Energy

A review of impulse turbines for wave energy conversion

Transactions of the Japan Society of Mechanical Engineers Series B

Study on an Impulse Turbine for Wave Power Conversion.

Journal of Fluid Mechanics

Wave-power absorption by an oscillating water column in a channel

Study of an impulse turbine for wave power conversion: Effects of Reynolds number and hub-to-tip ratio on performance

Journal	Journal of Offshore Mechanics and Arctic Engineering
ISSN	08927219
Open Access	No