Performance prediction of an Impulse turbine under real sea conditions using numerical simulation techniques

摘要

This paper presents the work carried out to predict the behavior of arn0.6m Impulse turbine with fixed guide vanes with 0.6 hub to tip (H/T)rnratio under real sea conditions. Water surface elevation verses timernhistory based on Pierson Moskowitz Spectra was used as the input data.rnA typical Oscillating Water Column (OWC) geometry has been used forrnthis simulation. Standard numerical techniques were employed to solvernthe non-linear behavior of the sea waves. Considering the quasi-steadyrnassumption, unidirectional steady flow experimental data was used tornsimulate the turbine characteristics under irregular unsteady flowrnconditions. The test rotor used for this simulation consisted of 30 bladesrnwith elliptical profile with a set of symmetric, fixed guide vanes on bothrnup-stream and down-stream sections of the rotor, with 26 vanes each.rnThe results show that the performance of this type of turbine is quiternstable and is similar to the behavior of the turbine under steady flowrnconditions. The objective of this paper is to predict the behavior of thernImpulse turbine under irregular, unsteady conditions for wave powerrnconversion using numerical simulation.