지면효과익선 개발을 위한 기초 실험 연구

Abstract

본 논문에서는 차세대 해상고속 운송체의 하나로 각국에서 개발되고 있는 WIG에 사용되고 있는 익형에 대한 공력특성을 통하여 연구하였다.

NACA 계열의 익형 9종과 S-type의 익형 4종에 대해 풍동실험을 통하여 지면효과에 대한 특성을 조사 하였으며, 실험에 사용된 익형 중 구 소련에서 해면효과익선용으로 개발한 익형(DHMTU 계열 : Department of Hydromecbanics of Marin Technical University)의 2종류와 양력특성이 우수한 NACA 6409익형에 대해 보다 자세한 실험 연구를 행하였다. 모형?? 가로세로비가 1.5이고 스팬(span)이 450㎜ 시위(chord)가 300㎜인 모형을 제작하여 실험에 사용하였다.

지면에 접근할 때 양항비의 경우 각 받음각에 대해 4˚ 부근에서의 값이 가장 크게 나타났고 NACA 6409의 경우 약 8에서 12정도이고 DHMTU 8에서 10정도이다. 피칭모우멘트에 있어서는 공력중심인 시위의 1/4근방에서 DHMTU계열의 익형이 NACA 6409보다 절대값이 매우 작게 나타났다.

따라서 WIG와 같은 수송체는 세로 운동특성이 매우 중요한 인자이기 때문에 세로운동자세 제어에 용이한 피칭모우멘트값이 작은 DHMTU 계열이 유리한다.

In recent years, various kinds of high speed vehicle have been developing for marine transportation in many countries. A Wing-in-ground effect ship(WIG) is expected for candidate as a super high speed vehicle in the future. WIG is sustained by the aerodynamic lift generated by cambered-airfoil wing, and flies just above the sea surface.

In this paper, the aerodynamic characteristics of two different type of cambered airfoils in ground effect are investigated through wind tunnel tests, to select better suitable airfoils for WIG. One is highly cambered airfoil NACA 64 series and the other is DHMTU series which have already been used to the EKRANO PLAN, a Russian WIG, developed by Department of Hydrmechanics of Marin Technical University. As result, it is shown that NACA 64 series are more effective in the lifting force, but DHMTU have smaller pitching moment about the quarter chord point, which can produce easier control of longitudinal motion

In recent years, various kinds of high speed vehicle have been developing for marine transportation in many countries. A Wing-in-ground effect ship(WIG) is expected for candidate as a super high speed vehicle in the future. WIG is sustained by the aerodynamic lift generated by cambered-airfoil wing, and flies just above the sea surface.

In this paper, the aerodynamic characteristics of two different type of cambered airfoils in ground effect are investigated through wind tunnel tests, to select better suitable airfoils for WIG. One is highly cambered airfoil NACA 64 series and the other is DHMTU series which have already been used to the EKRANO PLAN, a Russian WIG, developed by Department of Hydrmechanics of Marin Technical University. As result, it is shown that NACA 64 series are more effective in the lifting force, but DHMTU have smaller pitching moment about the quarter chord point, which can produce easier control of longitudinal motion