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- W2604812268 abstract "An unsteady model of a rotor is devised in this chapter. The analytical model can be used to investigate dynamic inflows and the unsteady evolution of the velocity field in the domain. It is based on the superposition of cylindrical vortex wake models under finite tip-speed ratios presented in Chap. 18. The term unsteady is here understood as a change in time of the rotor circulation between two azimuthally constant circulation distributions. This case can correspond to a uniform change of wind speed on the rotor area, or, a synchronous pitching of the blades. The chapter begins with a brief literature review on the topic of dynamic inflow and vorticity-based methods. Similar to the approach chosen in Chap. 18, an elementary system is introduced first before presenting a superposition of elementary systems. The results from the model are compared with measurements and with results from an unsteady BEM code for a case where the wind turbine blades follow a pitch step. The results from the unsteady vortex model are consistent with both the measurements and the BEM results. The advantage of the model is that it does not depend on empirical parameters nor on the time step used for the simulation. Such dynamic inflow information is important for the tuning of wind turbine controllers. Results from this chapter are published in the article titled “Superposition of vortex cylinders for steady and unsteady simulation of rotors of finite tip-speed ratio” (Branlard and Gaunaa, 2015, [3]). The chapter is based on results derived in Chap. 18." @default.
- W2604812268 created "2017-04-14" @default.
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- W2604812268 date "2017-01-01" @default.
- W2604812268 modified "2023-09-27" @default.
- W2604812268 title "Model of a Wind Turbine with Unsteady Circulation or Unsteady Inflow" @default.
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- W2604812268 doi "https://doi.org/10.1007/978-3-319-55164-7_26" @default.
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