基于X2TD高速直升机的前行桨叶概念旋翼翼型指标设计方法

An indicator design method of advancing blade concept rotor airfoil based on X2TD aircraft

  • 摘要: 为准确模拟高速旋翼机桨叶剖面气动特性,发展了基于CFD/CAMRAD Ⅱ耦合算法的直升机旋翼翼型工作环境分析方法,并对方法进行了验证。在此基础上针对直升机旋翼桨叶变迎角、变马赫数的工作特点,构建了基于“α-Ma平面升阻比等高线”的全方位/全剖面旋翼翼型指标设计方法。从研究前行桨叶概念旋翼大反流、强径向流、强压缩性流场特点和升力偏置、变转速工作方式入手,针对X2TD直升机高速飞行状态下上/下旋翼、前/后行侧桨叶翼型剖面的气动特征,有针对性地提出旋翼翼型选择标准或设计、改进方向,并与国外设计结果进行了对比分析,得到了一些有意义的结论。所建立的翼型指标设计方法和计算分析结果可为高速直升机旋翼气动设计的深入研究提供参考。

     

    Abstract: In order to simulate the aerodynamic characteristics of high speed helicopter blade sections, an operating condition analysis method for helicopter rotor airfoil is developed and verified based on the CFD and CAMRAD Ⅱ method. And an airfoil indicator design method, named “α-Ma plane lift-drag ration contour”, is constructed, taking into account of the characteristics of Mach number and angle of attack of a rotating blade. The method is suitable for the airfoil indicator design in full azimuth and full span blade sections, and is used to analyze the Advancing Blade Concept rotor airfoils. Based on the study of ABC rotor flow field characteristics of large reverse flow field, strong radial flow, strong compressible flow, lift offset and variable rotation speed as well as the further analysis of the aerodynamic characteristics of advancing and retreating side blade airfoil section for both upper and lower rotors, the improvement of airfoil selection criteria and design indicator have been done. The computational results are in good agreements with the reference results. The airfoil indicator design method and computational results are useful for the intensively studying of ABC rotor aerodynamic design.

     

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