通过加装一台套单旋翼试验台,与原有的单旋翼试验台组成了双旋翼试验台.基于测力天平和PIV技术,通过改变前后两旋翼的水平和轴向间距,测量了纵列式双旋翼不同气动布局干扰状态下的流场特性和旋翼性能,并与单旋翼情况进行了比较.分别给出了悬停和前飞状态下的旋翼速度场和涡量场分布,对比了不同纵向和轴向间距对双旋翼性能的影响.结果表明:悬停时,后旋翼性能和单旋翼基本一致;前飞时,后旋翼性能比单旋翼差,且随前进比的增加,后旋翼性能与单旋翼性能的差距会更大.%A twin-rotor test rig is assembled by equipping another test rig.Using the balance and PIV technique, experimental investigations on the flow field and performance of tandem model rotors are conducted by altering the longitudinal and axial distance between the twin rotors.Furthermore, comparisons of the flow field and performance between tandem rotor and a single rotor are carried out.The flow field and vortices of model rotor both in hovering and in forward flight are shown, and the effects of different longitudinal and axial distances between the twin model rotors on their performance are compared.As a result, the performance of rear rotor is similar with that of single rotor in hovering, while it is slightly worse than that of single rotor in forward flight.And it becomes worse and worse with the increase of the advance ratio.
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