A numerical study on performance improvement of counter-rotating type tidal stream power unit

29th IAHR Symposium on Hydraulic Machinery and Systems

Jung, Hoyun^1 ; Kanemoto, Toshiaki^1 ; Liu, Pin^1 ; Murakami, Tengen^1

Institute of Ocean Energy, Saga University, Saga

840-8502, Japan^1

关键词: Counter rotating;    Inlet conditions;    Numerical optimization algorithms;    Response surface method;    Rotational speed;    Single objective optimization;    Tidal stream energy;    Tidal stream power;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/5/052013/pdf
DOI  :  10.1088/1755-1315/240/5/052013

来源: IOP

【 摘 要 】

One of the forms of ocean energy, tidal stream energy is attracting attention as a sustainable, predictable and eco-friendly ocean energy source. Unique tandem propellers that can counter-rotate have been designed to generate electric power effectively from a tidal stream. This type of power unit has several advantages compared to the conventional unit with a single propeller and the increase in efficiency of counter-rotating type tidal stream power unit has already been proven. The counter-rotating type tidal stream power unit has a complex interrelationship between the front and rear propeller contrary to the conventional single propeller type tidal turbine. Such as, the no-load area on the front propeller, the diameter ratio of front and rear propeller and the rotational speed of each propeller, etc.. And the inlet condition of the rear propeller is very important to improve the efficiency. Thus, we have to consider these parameters to optimize tidal stream power unit. In this research, the numerical optimization algorithm with response surface method and adaptive single-objective optimization method are applied to obtain desirable propeller performance.