关于螺旋桨桨叶有利迎角的探讨

通过桨叶的性质角与迎角关系的数学模型，对桨叶有利迎角进行了分析研究。当桨叶迎角和桨叶性质角变化时，桨叶极线图和桨叶总空气动力向拉力轴靠近或离开，由此找出桨叶的最有利状态。通过分析得出，桨叶迎角接近桨叶临界迎角时最有利。最后通过桨叶极线图和桨叶总空气动力方向变化的模型实验验证了此结论的正确性。

Study of the Optimum Angle of Attack for the Propeller Blade

In this article, the optimum angle of attack of the propeller blade is analysed on the basis of the study of the mathematical model which demonstrates the relationship between the characteristic angle and the angle of attack of the propeller blade. When the angle of attack and the characteristic angle vary, the polar curve of the propeller blade and total blade aerodynamic will draw close to or be away from the thrust axis, thus we will get the most advantageous state of the propeller blade. From the analysis above, we can conclude that it is the most advantageous when the angle of attack of the propeller blade is close to the critical angle of attack. In the end, the conclusion is verified through the model experiment demonstrating the directional change of the polar curve of the propeller blade and total aerodynamic of the blade.