지면효과 속에 놓인 이중로터의 공력 특성에 대한 수치적 연구 (NUMERICAL STUDY ON AERODYNAMIC CHARACTERISTICS OF DOUBLE ROTORS IN-GROUND-EFFECT)

서지정보

· 발행기관 : 한국전산유체공학회
· 수록지 정보 : 한국전산유체공학회지 / 27권 / 3호 / 60 ~ 67페이지
· 저자명 : 김훈재, 장호준, 정지인, 김병수

초록

Multi-copters are used in various fields as unmanned aerial vehicles. Consequently, the stability of the operation conditions of the unmanned aerial vehicle and the improvement of aerodynamic characteristics are required. Therefore, this study is intended to examine the effect of the wake interaction between rotors in ground effect when a set of double rotors is positioned adjacent to the ground through an unsteady numerical analysis. For this reason, the rotor is positioned adjacent to the ground, and the thrust ratio is measured while changing the distance between the rotors which are rotating at a fixed rotational speed. With the ground height as z and the rotor radius as R, the smaller the height ratio(z/R), the higher the thrust. As the distance between the rotors became smaller, the collision and interaction between wing tip vortices of the rotor blades got stronger, and the flow was not properly propagated into the direction of the wake. It is shown that when the rotor gets closer to the ground, the flow could not be fed back in after flowing along the ground, so the thrust ratio due to the ground effect tends to decrease. With these results and analysis, the effect of wake interference between rotors on the ground effect could be confirmed.

영어초록

Multi-copters are used in various fields as unmanned aerial vehicles. Consequently, the stability of the operation conditions of the unmanned aerial vehicle and the improvement of aerodynamic characteristics are required. Therefore, this study is intended to examine the effect of the wake interaction between rotors in ground effect when a set of double rotors is positioned adjacent to the ground through an unsteady numerical analysis. For this reason, the rotor is positioned adjacent to the ground, and the thrust ratio is measured while changing the distance between the rotors which are rotating at a fixed rotational speed. With the ground height as z and the rotor radius as R, the smaller the height ratio(z/R), the higher the thrust. As the distance between the rotors became smaller, the collision and interaction between wing tip vortices of the rotor blades got stronger, and the flow was not properly propagated into the direction of the wake. It is shown that when the rotor gets closer to the ground, the flow could not be fed back in after flowing along the ground, so the thrust ratio due to the ground effect tends to decrease. With these results and analysis, the effect of wake interference between rotors on the ground effect could be confirmed.

참고자료

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