采用数值模拟方法进行了FB-4000-1000与FB-4000-2000钝后缘翼型的后缘减阻装置研究.分析了后缘减阻隔板安装位置对翼型气动特性的影响.其中后缘台阶中部安装隔板,以升力的小幅损失为代价实现中小迎角范围内减阻约35％,而在较大迎角时减阻约20％.%The numerical code base on coupling of large-eddy simulation ( LES) and discrete element method ( DEM ) is developed. Three dimensional transport of gas-solid two phase aeolian sand is simulated with the code. Ve locities and angles of incident and lift-off sand particles near the surface of sand bed are analyzed statistically. The re sults show that the code is able to simulate the features of motion of sand particles in aeolian sand flow. The lognormal function can be used to express the distribution of incident and lift-off velocities of sand particle. The value of distribu tion functions in a more focused with the increase of wind speed. Angle of incident and lift - off concentrate in 10 and 15 degree separately. This indicate that the momentum of sand particles tend to transfer to the vertical direction.Spanwise velocities of sand are more significant with the increase of wind speed.
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