Studies on vortex interaction mechanism and aerodynamic characteristic of scissors tail rotor

被引：0
|
作者：
Zhu Z. [1 ]
Zhao Q. [1 ]
Wang B. [1 ]
机构：
[1] National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics, Nanjing University of Aeronautics and Astronautics, Nanjing
来源：
Zhao, Qijun (zhaoqijun@nuaa.edu.cn) | 1600年 / Chinese Society of Theoretical and Applied Mechanics卷 / 48期
关键词：
Aerodynamic characteristics; Blade-tip vortex; Flowfield; Helicopter; Navier-Stokes equations; Scissors tail rotor;
D O I：
10.6052/0459-1879-15-338
中图分类号：
学科分类号：
摘要：
The design of the unconventional scissors tail rotor has a powerful influence on the overall aerodynamic performance of helicopter, and the aerodynamic interaction mechanism of the unconventional tail rotor has been investigated due to its complexity. To get the interaction mechanism and aerodynamic characteristic of scissors tail rotor, a numerical method based on computational fluid dynamics (CFD) technique is established to simulate the vortex flowfield of scissors tail rotor in hover. Based on the embedded grid system, a CFD simulation method is developed by solving the compressible Reynolds-averaged Navier-Stokes (RANS) equations. Based on the validation of the CFD method, the evolution laws of position and strength of blade-tip vortex for two different scissors tail rotors are obtained by quantitative analysis in hover. Thus, close vortex-surface interactions, impingement and burst motions in the process of blade-vortex interaction are analyzed in detail, also the interaction and mergence process among the different scales vortex has been captured accurately. Furthermore, the influences of the two configuration parameters (scissors angle and vertical space) on their aerodynamic characteristics have been analyzed in hover. The simulated results demonstrate that the flowfield of the scissors tail rotor is very complicated due to various blade-vortex and vortex-vortex interaction. In addition, the configuration parameters of scissors tail rotor have important effects on its aerodynamic characteristics, and configuration L shows more advantages of improving the aerodynamic performance than configuration U has. © 2016, Editorial Office of Chinese Journal of Theoretical and Applied Mechanics. All right reserved.
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页码：886 / 896
页数：10
相关论文
共 31 条
  • [1] Amer K.B., Prouty R.W., Technology advances in the AH-64 advanced attack helicopter, Vertica, 8, 2, pp. 133-164, (1984)
  • [2] Sonneborn W.G.O., Drees J.M., The scissors rotor, Journal of the American Helicopter Society, 20, 3, pp. 18-27, (1975)
  • [3] Rozhdestensky M.G., Scissors rotor concept: new results obtained, American Helicopter Society 52nd Annual Forum, pp. 1231-1241, (1996)
  • [4] Sullivan B.M., Edwards B.D., Brentner K.S., Et al., A subjective test of modulated blade spacing for helicopter main rotors, Journal of the American Helicopter Society, 50, 1, pp. 26-32, (2005)
  • [5] Xu G.H., Wang S.C., Zhao J.G., Experimental and analytical investigation on aerodynamic characteristics of helicopter scissors tail rotor, Chinese Journal of Aeronautics, 14, 4, pp. 193-199, (2001)
  • [6] Brentner K.S., Edwards B.D., Riley R., Predicted noise for a main rotor with modulated blade spacing, Journal of the American Helicopter Society, 50, 1, pp. 18-25, (2005)
  • [7] Xu G.H., Zhao Q.J., Peng Y.H., Study on the induced velocity and noise characteristics of a scissors rotor, Journal of Aircraft, 44, 3, pp. 806-811, (2007)
  • [8] Fan F., Shi Y., Xu G., Computational research on aerodynamic and aeroacoustic characteristics of scissors tail-rotor in hover, Acta Aeronautica Astronautica Sinica, 34, 9, pp. 2100-2109, (2013)
  • [9] Zhu Z., Zhao Q.J., Numerical analyses for aerodynamic and noise characteristics of helicopter scissors tail rotor, American Helicopter Society 70th Annual Forum, pp. 1186-1198, (2014)
  • [10] Thomas P.D., Middlecoff J.F., Direct control of the grid point distribution in meshes generated by elliptic equations, AIAA Journal, 18, 6, pp. 652-656, (1980)
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