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A Performance Study of a Cross-flow Air Turbine Utilizing an Orifice for OWC WEC
강홍구,김병하,이영호 한국유체기계학회 2017 한국유체기계학회 논문집 Vol.20 No.3
A cross-flow air turbine is a candidate for usage of a self-starting turbine due to its characteristic, which are high coefficient at a low tip speed ratio, excellent stability and low noise. With its characteristics this turbine can be more suitable for OWCs (Oscillating Water Columns) which require low noise and high maintenance compared to typical commercialized air turbines such as Wells and impulse turbine. The investigation of a cross-flow air turbine, in this research, for OWC wave energy converter have been undertaken. First, a numerical analysis of the full-scaled turbine by CFD have been conducted in order to acquire its performance characteristics in various range of the flow rate with different rotational speed of the rotor. Model scale analysis was then proposed to design and compare with experimental model, and 1/16 model scale was determined. In addition, an orifice plate as substitute was adopted not only to simulate the behavior of the turbine by numerical analysis and experiment but also to verify the CFD result by the experiment result. The size of the orifice plate was determined by matching between the pressure drop across the upstream and downstream of the turbine and orifice. With the entire result, the comparative study between orifice plates and turbine simulation have been proposed.