著者

糸賀 紀晶 井星 正氣 沖田 理香 佐藤 旭

出版者

一般社団法人 日本航空宇宙学会

雑誌

日本航空宇宙学会論文集 (ISSN:13446460)

巻号頁・発行日

vol.61, no.6, pp.174-180, 2013 (Released:2014-06-27)

参考文献数

7

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To land a helicopter on a flight deck of a ship is said to be one of difficult operations even for experienced pilots because the helicopter rotor is affected by complex flows, e.g. ship airwakes and interference flows formed between the rotor and superstructures, in addition to ship motions. Therefore, it is important to grasp quantitatively influence of these complex flows on the helicopter rotor for securing the safe deck-landing. In this paper, CFD analysis of helicopter rotor operating over a flight deck is done by solving unsteady 3D compressible Euler equations with an overlapped grid system. The superstructure on a flight deck is modeled by a simple sharp edged bluff body. Parameters for numerical analysis are landing spot and relative wind speed to the rotor and ship. Effects of these parameters on the rotor torque, flowfields around the rotor and inflow distributions on the rotor disc are clarified.

著者

井星 正氣 糸賀 紀晶 前田 孝一 J. V. R. Prasad

出版者

一般社団法人 日本航空宇宙学会

雑誌

日本航空宇宙学会論文集 (ISSN:13446460)

巻号頁・発行日

vol.52, no.606, pp.302-308, 2004 (Released:2004-08-05)

参考文献数

15

被引用文献数

1 3

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Modern day helicopters are frequently required to operate close to non-uniform ground surfaces. During operations above a moving ship deck, it can be foreseen that the hovering performance of the rotor has very different behavior compared with the cases of hovering above stationary flat ground plane. In this report, the hovering performance of the rotor above the moving ground in full ground effect is experimentally studied in order to provide qualified database for the validation of analytical study on dynamic ground effect. The moving ground is simulated by means of harmonic rolling and heaving motions of ground effect plate with variable amplitude and frequency. The thrust, torque and blade flap angle of the rotor were measured at rotor height from 0.4 to 1.5. It is shown that motion types of the ground and the amplitude and frequency of the moving ground have important effects on the variable loads in and out of the rotor disk in dynamic ground effect.