Wake Numerical Simulation of Wind Field Based on Two Modified Wind Engineering Models

With the assumption of the Park model that the wake region is in linear expansion and the cross-wind is in multinomial and Gaussian distribution in wake region, one develops the Park-polynomial model and the Park- Gaussian model to numerically simulate the wake flow field for a single wind turbine. Compared with the measured data of wind farm and the wind tunnel test, it shows that the prediction precision of wake field has been improved obviously under the modified initial wake radius. Moreover, both of the newly modified two models could well simulate the wind velocity in wake region, because the predicted results is approximately consistent with the test result, and the cross-wind distribution conforms to that of the real flow field. The two models have still inherited many advantages of engineering models, such as simple form, easy-to-code, and high computational efficiency. Particularly, the Park-Gaussian model is the best in overall performance among them.