• Title/Summary/Keyword: 관절형 허브

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An Experimental Study on Flapping Motion of Forward Flight Condition used to Articulated Hub Rotor (관절형 허브 로터를 이용한 전진비행조건에서의 플래핑 운동에 대한 실험적 연구)

  • Ryi, Jae-Ha;Back, Dong-Min;Rhee, Wook;Choi, Jong-Soo;Song, Keun Woong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.4
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    • pp.261-267
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    • 2013
  • In this paper, wind tunnel test and analytical prediction are compared for result of flapping motion in helicopter forward flight condition. Tests were performed at low speed wind tunnel at Chungnam National University, test section of wind tunnel has 1.8 by 1.8 meter open-jet test section area. According to the results of measured data for aerodynamic performance of model rotor in forward flight. It has to observed the difference of analytical and measured results of power coefficient for fixed thrust coefficient. And calculated and measured data of helicopter rotor flapping angles in forward flight are compared for a model rotor in a wind tunnel. A test was conducted to verify the measured data of coning and lateral/longitudinal flapping angle with predicted values.

Experimental Study on the Evolution of Tip Vortex Structures Generated by a Two-Bladed Rotor (2개의 블레이드로 구성된 회전익 끝와류들의 간섭 특성)

  • Sohn, Yong-Joon;Park, Byung-Ho;Han, Yong-Oun
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.7
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    • pp.709-715
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    • 2011
  • In order to observe the wake interaction between tip vortices generated by a two-bladed rotor with slightly different pitch angles, the velocity components of the tip vortices were measured by using a two-dimensional LDV system. It was observed that the swirl velocity components of the ensuing blade deviated from the Vatistas' n = 2 vortex model and the axial velocity components of the preceding blade deviated from the Gaussian profile. It was also found that in the wake-age range of $200^{\circ}$ to $240^{\circ}$, the filament of the ensuing blade tip vortex was stretched as result of the closing in of two vortices. The results from these observations suggest the possibility that a similar wake interaction is generated in actual rotor blades, especially, in the ones with articulated hubs.