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Volume 32 Issue 02
Feb.  2006
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Journal of Beijing University of Aeronautics and Astronautics  > 2006  >  32(02): 176-180.
Zeng Hongjiang, Hu Jizhong. Parameter influence analysis of free-wake numerical method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2006, 32(02): 176-180. (in Chinese)
Citation: Zeng Hongjiang, Hu Jizhong. Parameter influence analysis of free-wake numerical method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2006, 32(02): 176-180. (in Chinese)
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Parameter influence analysis of free-wake numerical method

  • School of Aeronautic Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • Received Date: 20 Jan 2005
  • Publish Date: 28 Feb 2006
    Abstract
  • The parameter influence of rotor free-wake method was presented, including blade discrete segments, vortices grid density and wake length. Several areas were made from blade root to blade tip. The inside area was segmented coarsely but the tip area was segmented more densely. The segment density of inside area has lower influence on the numerical result than that of tip area. Vortices were used to model unsymmetrical aerofoil. The density of vortices can affect the numerical result obviously. Proper density is needed and too dense vortices grid can not improve the accuracy of numerical result. For the hover and low speed flight state, 9 loops of wake is enough to get accurate numerical result, and for climb and high speed flight state 7 loops of wake is enough. The influence of time cost of these parameters was also discussed and wake length has the most influence.

     

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  • [1] 高 正. 直升机空气动力学的新成果[M] 北京:航空工业出版社, 1999. 20~22 Gao Zheng. New work of helicopter aerodynamics[M] Beijing:Aviation Industry Press, 1999. 20~22(in Chinese) [2] 曾洪江,胡继忠. 涡核对自由涡计算的影响研究 . 见:2004直升机年会论文集 .北京:中国航空学会, 2004. 553~559 Zeng Hongjiang, Hu Jizhong. The effect of vortex core in free wake calculation . In:Annual Forum of the China Helicopter . Beijing:Chinese Society of Aeronautics and Astronautics, 2004. 553~559(in Chinese) [3] 曾洪江,胡继忠.一种新的自由涡尾迹计算方法[J] 航空学报, 2004, 25(6):546~550 Zeng Hongjiang, Hu Jizhong. A new method of free-wake calculation[J] Chinese Journal of Aeronautics, 2004, 25(6):546~550(in Chinese) [4] Caradonna F X, Tung C. Experimental and analytical studies of a model helicopter rotor in hover[J] Vertica, 1981, 5(2):149~161 [5] Leishman J G, Baker A, Coyne A. Measurements of rotor tip vortices using three-component laser doppler velocimetry[J] Journal of the American Helicopter Society, 1996,41(4):342~353
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