A New Stall Delay Model for HAWT Based on Inviscid Theory
Aeroelastic analysis of wind turbine blade is one of the most important studies, which is a typical phenomenon of the fluid–structure interaction. In order to increase the accuracy of the aeroelastic analysis, in this paper, we developed a new three-dimen
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Abstract Aeroelastic analysis of wind turbine blade is one of the most important studies, which is a typical phenomenon of the fluid–structure interaction. In order to increase the accuracy of the aeroelastic analysis, in this paper, we developed a new three-dimensional (3D) stall delay model for horizontal axis wind turbine (HAWT), which is inviscid stall delay model (ISDM). The model is derived from the Navier–Stokes equations, in which we treat the stall delay effects differently by the delay of the separation point on the airfoil, and aim to capture the further negative pressure reduction in the separation area due to the span wise flow driven by the centrifugal force on the rotating blade. Based on the analytical solution, the ISDM is created and the correction factor S is analyzed. In order to validate ISDM, the model is applied to the NREL Phase VI wind turbine blade. Both the corrected lift and drag coefficients and the power/torque results are compared with the experimental data. From the comparison it can be concluded that ISDM gives reasonable predictions of the 3D lift and drag coefficients as well as the corresponding power and thrust force obtained from blade element and moment (BEM) computation.
1 Introduction The BEM theory is widely applied to the aeroelastic analysis of the wind turbine, which is a typical fluid–structure interaction phenomenon during the operation of wind turbine. However, as one important hypothesis of BEM, the span wise flow is Y. Xu (&) J. Z. Xu Key Laboratory of Wind Energy Utilization, Chinese Academy of Sciences, Beijing, China e-mail: [email protected] Q. Wang Graduate School of Chinese Academy of Sciences, Beijing, China
Y. Zhou et al. (eds.), Fluid-Structure-Sound Interactions and Control, Lecture Notes in Mechanical Engineering, DOI: 10.1007/978-3-642-40371-2_52, Springer-Verlag Berlin Heidelberg 2014
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ignored and the local flow field is treated as two-dimensional (2D). For a rotating wind turbine blade, the stall delay effect is usually associated with the span wise flow, which may play an important role in determining the loads and output power, especially for the stall regular wind turbine (Hand et al. 2001). In order to take stall delay effect into consideration, it is necessary to add a 3D stall delay model in BEM computation. During the past decades, different 3D stall delay models have been developed. Snel et al. analyzed the 3D boundary layer on wind turbine blade by dimensional analysis and set up a stall delay model which has quadratic relationship with the local ratio between the chord length and the span wise position (Snel et al. 1994). Based on his work, Chaviaropoulos and Hansen used a quasi-3D Navier-Stocks (N–S) solver to analyze the rotational effects of wind turbine blade and added the influence of the local twist angle to their stall delay model (Chaviaropoulos and Hansen 2000). Snel’ work was also developed by Du and Selig by assuming the velocity profile in the boundary layer to be Pohlhausen type (Du and Selig 1998). Du’
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