Based on Simplic algorithm and SST κ-ωturbulence model, using numerical simulation software Fluent 6.3, the 3D aerodynamic flow field of a new type of small double-rotor wind turbines has been studied and compared with that of single-rotor wind turbines in same size. Results show that compared with single-rotor wind turbine, the turbulence intensity of new double-rotor wind turbine strengthens along with the increase of blade number of rear rotor, and its operation stability reduces to a certain extent; however, the rear rotor with a reasonable number of blades has little influence on the front rotor, which can capture the air leakage of the front rotor effectively, and therefore enables the wind turbine to simulta- neously have a larger windward area and maintain a higher rotating speed, and subsequently helps it to achieve two grade utility of wind energy, improve the power generation efficiency and raise the wind power utilization coefficient.%基于Simplic算法，采用SST κ-ω湍流模型，利用Fluent6．3数值模拟软件对新型的小型双风轮风力机的气动特性进行了三维流场研究，并与同规格单风轮风力机的三维流场进行了比较．结果表明：与单风轮风力机相比，随着后风轮叶片数目的增加，新型双风轮风力机的湍流强度变大，风力机运行的稳定性在一定程度上有所降低；当后风轮的叶片数目合理时，后风轮对前风轮的影响较小，且可以有效地捕捉到前风轮的漏风，使得新型双风轮风力机的风轮在获得较大迎风面积的同时可以保持较高的转速，进而能够高效地实现风能的两级利用，明显提高发电功率和增大风能利用系数．
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