Transactions of Nanjing University of Aeronautics & Astronautics
Special Issue for Wind Turbine
Simulation of SLD Impingement on Wind Turbine Blade Airfoil
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Abstract:
Prediction of droplet impingement on wind turbine blade accurately is one of the most important premises of anti-icing and de-icing system design. In SLD conditions, droplet no longer maintains the sphere shape, it may deform, break up, and splash when it is moving or impinging on the surface. Semi-empirical models of droplet dynamic behaviours are embedded into the Eulerian droplet model to improve the accuracy of the numerical simulation of droplet impingement limits and local collection efficiency. Eulerian droplet model ( Model1) for small droplets and improved Eulerian droplet model ( Model2) for large droplet are both validated by comparing to the wind tunnel experiment results. Using the methods mentioned in this paper, droplet impingement limitation and local collection efficiency on the S809 airfoil are calculated in various conditions. A detailed derivation of Model1 and Model2 is presented along with a comparison of numerical trajectories, drag coefficient and collection efficiency distributions. The results show that droplet dynamic behaviours including splashing, breaking up and deforming must be considered to accurately simulate the impingement behaviour in SLD conditions. And with the increasing of the droplet diameters, the effects of the droplet dynamic behaviors on the impingement characteristics are more obvious.
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