关键词: 复杂地形, 计算流体力学, 现场实测, 风能评估, 微观选址

Abstract:

To evaluate the wind energy distribution in a complex terrain which is impossible to be done by using traditional methods,two strong wind events with stable wind direction were selected from the field record of a real complex terrain and were used as the researching objects.Then,the wind field in the terrain was meshed into hexahedral grids with two resolutions of 40m×40m and 20m×20m,and two turbulence models,namely SST k-ω and RNG k-ε,were adopted to simulate the wind speed field distribution.The simulation results of the wind indicate that SST k-ω model is superior to RNG k-ω model because it is of higher accuracy of the grid with a horizontal space of 20 m, and that, in the case of SST（20 m） , the mean relative errors between the simulated and the measured wind speeds in 157° and 83° directions are respectively 6.46% and 5.50%. The authors also proposed a fulldirection wind energy evaluation method applicable to complex terrains, which takes into consideration both the wind speeding ratio distribution obtained from CFD simulation and the local normal meteorological data.

Key words: complex terrain, computational fluid dynamics, field measurement, wind energy evaluation, micro-siting