Experimental study to the influences of rotational speed and blade shape on water vortex turbine performance

15th Asian Congress of Fluid Mechanics

物理学;力学

Kueh, T.C.^1 ; Beh, S.L.^2 ; Ooi, Y.S.^1,3 ; Rilling, D.G.^4

Centre for Advanced Materials and Green Technology, Multimedia University, Melaka

75450, Malaysia^1

University of Southampton Malaysia Campus, No. 3, Persiaran Canselor 1, Nusajaya, Johor.S

79200, Malaysia^2

Faculty of Engineering and Technology, Multimedia University, Melaka

75450, Malaysia^3

Studiendekan School of Engineering and Technology Management, Akad University, Stuttgart

70469, Germany^4

关键词: Free-surface vortices;    Improvement analysis;    Literature studies;    Maximum Efficiency;    No-load conditions;    Power plant system;    Turbine performance;    Velocity triangles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/822/1/012066/pdf
DOI  :  10.1088/1742-6596/822/1/012066

学科分类：力学，机械学

来源: IOP

【 摘 要 】

Water vortex turbine utilizes the natural behaviour of water to form free surface vortex for energy extraction. This allows simple construction and ease of management on the whole water vortex power plant system. To our findings, the literature study specifically on water vortex turbine is inadequate and low efficiency was reported. Influences of operating speed and blade shape on turbine performance are the two parameters investigated in this study. Euler Turbomachinery Equation and velocity triangle are used in the improvement analysis. Two turbines with flat blades and curved blades are tested and compared. Both turbines show similar rotational speed at no load condition. This suggested that the circulation force of the water vortex has more dominant effect on the turbine rotational speed, compared to the turbine's geometry. Flat-blades turbine showed maximum efficiency of 21.63% at 3.27 rad/s whereas curved-blades turbine showed 22.24% at 3.56 rad/s. When operating load is applied, the backward-leaning curve helps the turbine blades to reduce the disturbance on the water vortex, and hence provide a better performance.