Читать книгу Wind Energy Handbook - Michael Barton Graham - Страница 83

If the rotational speed of a turbine is maintained at a constant level, then the tip speed ratio is continuously changing, and a blade optimised for a fixed tip speed ratio would not be appropriate. Closed‐form solutions have been derived for optimum wind turbines; see Peters and Modarres (2013) and Jamieson (2018).

No simple technique is available for the optimal design of a blade operating at constant rotational speed. Non‐linear (numerical) optimisation techniques may be used to solve the problem of maximising energy capture at a given site incorporating the data on its specific wind speed distribution. Alternatively, a design tip speed ratio can be chosen corresponding to the wind speed at the specified site that contains the most energy, or, more practically, the pitch angle for the whole blade can be adjusted to maximise energy capture.