基于松弛自由尾迹方法的旋翼性能计算和优化.pdf

南京航空航天大学硕士学位论文

摘要
旋翼性能的研究是直升机空气动力学领域的基本课题之一。本文基于松弛自由尾迹分析,
建立了一个同时适合于悬停、垂直爬升及水平前飞的旋翼性能计算方法和模型,并通过多种算
例的计算,验证了该计算模型的可靠性。在计算旋翼性能的基础上,也对旋翼性能进行了优化
分析。具体研究内容如下:
作为前提和背景,在第一章简要介绍了旋翼尾迹方法、性能计算及其优化的国内外研究现
状,指出了采用自由尾迹方法进行旋翼性能估算的必要性和重要意义。
在第二章中,基于旋翼桨叶空气动力模型、卷起桨尖涡模型及旋翼配平模型,建立了一个
旋翼自由尾迹计算的方法。并在此基础上,建立了一个用于旋翼性能计算与分析的模型.
第三章,应用本文发展的旋翼性能计算方法和程序,分别针对全尺寸旋翼和模型旋翼在悬
停时的旋翼性能进行了计算,并验证了压缩性修正方法对旋翼性能计算的有效性。为表明该方
法对新型桨尖旋翼的适用性,本文还计算了尖削和尖削/后掠组合桨尖旋翼的性能。
在第四章,将上面的悬停状态旋翼性能计算模型拓展至适合于垂直爬升及平飞状态下的旋
翼性能计算,并研究了轴向来流对垂直飞行时旋翼尾迹形状的影响以及前飞速度对旋翼性能的
影响。
本文的第五章,通过耦合建立的旋翼性能计算模型和序列线形规划,建立了一个旋翼性能
优化分析的方法,并针对悬停状态的旋翼性能进行了优化分析。



关键词:直升机,气动性能,自由尾迹,旋翼,优化









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基于松弛自由尾迹方法的旋翼性能计算和优化

ABSTRACT
The investigation of rotor performance has continuously been one of the basic concerns in the field
of Helicopter Aerodynamics. In this thesis, a rotor performance prediction method and model, which
could be used to evaluate rotor performance in hover and vertical climb as well as forward flight, has
been developed based on a relaxation free-wake analysis. Different numerical examples are calculated
and the method is validated. Also, the optimization of rotor performance is included on the basis of
rotor performance calculations. The major research work in the thesis is as follows:
As the background of the current work, the domestic and overseas research results on the rotor
wake, rotor performance and its optimization have been introduced briefly in Chapter 1, and it is
pointed out that the free wake method is necessary for the research of helicopter rotor performance.
In Chapter 2, based on the blade aerodynamic model, rotor tip-vortex rolled-up model and rotor
trim model, a rotor free-wake method is developed. By using the free-wake method, a rotor
performance prediction and analysis model is presented.
In Chapter 3, applying putation model and codes developed in this thesis, the performance
calculations on the full-scale rotors and