改进型CLOR桨尖旋翼气动特性试验研究及数值分析

doi:10.7527/S1000-6893.2013.0027

Abstract

Abstract:

Wind tunnel test and numerical simulation are performed to investigate the aerodynamic characteristics of rotors with an improved CLOR (CLOR-Ⅱ)blade-tip in hover and forward flight. Taking into consideration the unsteady characteristics of the rotor flowfield, and aiming at advanced aerodynamic performance of the rotors in both hover and forward flight, the aerodynamic shape of the rotor blade is redesigned using aerodynamic analysis based on the investigations of rotors with CLOR tip. It mainly includes the optimal allocation of airfoils on the spanwise direction of the rotor blade for improving such properties as advancing blade compressibility and retreating blade dynamic stall, and the shape of the blade tip is designed meticulously taking into account the dynamic characteristics of the blade in forward flight. The three types of rotors are measured in a wind tunnel under multi-conditions. Based on these, the aerodynamic characteristics of rotors under the same conditions with the tests are simulated by computational fluid dynamics (CFD) and the calculated results are compared with the experimental results. Additionally, higher speed rotation conditions are also computed. Results show that the obvious advantages of the rotors with CLOR-Ⅱ tip in suppressing the transonic strength and increasing the stall angle of attack are demonstrated by comparing with the other two types of rotors, and the characteristics of the rotors in hover and forward flight are comprehensive improved.

Key words: aerodynamic characteristics, rotors, experiments, new type blade-tip, helicopters, computational fluid dynamics

CLC Number:

V211.52

WANG Bo, ZHAO Qijun, ZHAO Guoqing, XU Guohua. Experimental Research and Numerical Analysis on Aerodynamic Characteristics of Rotors with Improved CLOR Blade-tip[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(2): 235-245.

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Experimental Research and Numerical Analysis on Aerodynamic Characteristics of Rotors with Improved CLOR Blade-tip

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