论文信息 - Cavitation inception and simulation in blade element momentum theory for modelling tidal stream turbines

Cavitation inception and simulation in blade element momentum theory for modelling tidal stream turbines

Blade element momentum theory (BEMT) is an analytical modelling tool that describes the performance of turbines by cross-referencing one-dimensional momentum theory with blade element theory. Each blade is discretised along its length and the dynamic properties of torque and axial force are determined. A compatible cavitation detection model is introduced to indicate any cavitating blade elements. Cavitation occurrence is dependent on proximity to the free surface, the incident flow velocity and inflow angle and the blade cross-section aerofoil shape. The shock waves associated with cavitation can significantly damage the blade surface and reduce performance; therefore, this model is a useful addition to BEMT and can be used in turbine design to minimise cavitation occurrence. The results are validated using the cavitation experiment observations.

[1] Anthony F. Molland,et al. The prediction of the hydrodynamic performance of marine current turbines , 2008 .

[2] Ian Masters,et al. A robust blade element momentum theory model for tidal stream turbines including tip and hub loss corrections , 2011 .

[3] M. Giles,et al. Viscous-inviscid analysis of transonic and low Reynolds number airfoils , 1986 .

[4] Ian Masters,et al. Incorporating Turbulent Inflow Conditions In a Blade Element Momentum Model of Tidal Stream Turbines , 2011 .

[5] Ervin Bossanyi,et al. Wind Energy Handbook , 2001 .

[6] C. Waltz. Validation study. , 1988, NLN publications.

[7] R. K. Rajput,et al. Fluid Mechanics and Hydraulic Machines , 1998 .

[8] M. Drela. XFOIL: An Analysis and Design System for Low Reynolds Number Airfoils , 1989 .

[9] P. L. Fraenkel,et al. Power from marine currents , 2002 .

[10] R. T. Griffiths,et al. Performance of the optimal wind turbine , 1978 .

[11] Anthony F. Molland,et al. Measurements and predictions of forces, pressures and cavitation on 2-D sections suitable for marine current turbines , 2004 .

[12] Anthony F. Molland,et al. Power and thrust measurements of marine current turbines under various hydrodynamic flow conditions in a cavitation tunnel and a towing tank , 2007 .