知识与财富的链接
根据飞行速度、需用拉力、螺旋桨转速等参数,设计了某型飞机的三叶螺旋桨,获得了弦长和桨叶角沿着径向的分布.制造了三叶复合材料螺旋桨（直径为1.75m）,在螺旋桨试验台上测试了不同转速下螺旋桨的拉力.为了获得螺旋桨的动态性能,制造了螺旋桨的缩比模型（直径为0.96m）,在西北工业大学NF-3风洞的三元试验段测试了螺旋桨的气动性能数据,包括:拉力、扭矩、功率、效率.结果表明:螺旋桨最大效率为85.63%,所设计的三叶复合材料螺旋桨适用于螺旋桨需用功率为70kW左右的发动机（比如Rotax912）,提出的螺旋桨设计方法具有较好的应用价值.
According to the flight velocity, the required thrust and rotation speed of propeller, the three-blade propeller of an aircraft was designed, and the chord length and pitch angle distribution along the radial direction of propeller were obtained. The three-blade composite propeller (diameter of 1.75m) was manufactured based on the designed results, and the thrust of this propeller under various rotation speeds was measured using a propeller test rig. In order to obtain the dynamic performance of propeller, the scaled propeller(diameter of 0.96m) was manufactured, while the aerodynamic performance data of thrust, torque, power and efficiency were measured at the three-dimension test section of Northwestern Polytechnical University NF-3 wind tunnel. Results show that the maximum efficiency of propeller is 85.63%, this three-blade propeller is suitable for the 70kW engine (for example: Rotax 912), so this designed method of propeller has good applicable value.
