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    • 6. 发明授权
    • Laminar-flow airfoil
    • 层流翼型
    • US07093792B2
    • 2006-08-22
    • US10373694
    • 2003-02-27
    • Michimasa FujinoYoshinori Wariishi
    • Michimasa FujinoYoshinori Wariishi
    • B64C3/14
    • B64C3/14B64C2003/149Y02T50/12
    • An upper wing surface of a laminar-flow airfoil for decreasing an undesirable head-lowering pitching moment around an aerodynamic center of the airfoil. The upper wing surface includes: a convex front profile portion extending from a leading edge to a largest-thickness point located corresponding to 38% of a wing chord length. A convex central profile portion extends from the largest-thickness point to a position corresponding to 90% of the wing chord length at which a value obtained by dividing a thicknesswise difference between the position and the largest-thickness point by a distance in a direction of the wing chord from the largest-thickness point is equal to or smaller than 0.12. A concave rear profile portion extends from a position corresponding to 95% of the wing chord length to the trailing edge. The rear profile portion forms a pressure gradient is steeper than that formed by the central profile portion.
    • 层流翼型的上翼面,用于减少围绕翼型的空气动力学中心的不希望的降低俯仰力矩。 上翼表面包括:从前缘延伸到对应于翼弦长度的38%的最大厚度点的凸形前轮廓部分。 凸起的中心轮廓部分从最大厚度点延伸到对应于翼弦长度的90%的位置,在该位置处,通过将位置和最大厚度点之间的厚度差除以距离 最大厚度点的翼和弦等于或小于0.12。 凹形后轮廓部分从对应于翼弦长度的95%的位置延伸到后缘。 后轮廓部分形成的压力梯度比由中心轮廓部分形成的压力梯度更陡。
    • 7. 发明授权
    • Main wing structure
    • 主翼结构
    • US06834830B2
    • 2004-12-28
    • US10373963
    • 2003-02-27
    • Michimasa Fujino
    • Michimasa Fujino
    • B64C300
    • B64C3/28B64C3/14B64C2003/149Y02T50/12
    • A main wing structure comprises at least a leading edge structure and a wing central structure coupled to each other, and has a particular laminar-flow airfoil. The laminar-flow airfoil includes an upper wing surface, a lower wing surface, a leading edge and a trailing edge. The upper wing surface includes: a front profile portion which has a positive curvature radius, and which is provided to extend from the leading edge to a largest-thickness point located at 38% of a wing chord length; a central profile portion which has a positive curvature radius, and which is provided to extend from the largest-thickness point to the vicinity of a position corresponding to approximately 90% of the wing chord length at which a value obtained by dividing a thicknesswise difference between the position and the largest-thickness point by a distance in a direction of a wing chord from the largest-thickness point is equal to or smaller than 0.12; and a rear profile portion which has a negative curvature radius, and which is provided to extend from the vicinity of a position corresponding to approximately 95% of the wing chord length to the trailing edge. Coupled portions between the leading edge structure and the wing central structure are arranged at positions corresponding to approximately 20% of the wing chord length. Thus, it is possible to minimize an increase in drag due to a gap and a step between the coupled portions between the leading edge structure and the wing central structure.
    • 主翼结构至少包括前缘结构和彼此连接的翼中心结构,并且具有特定的层流翼型。 层流翼型件包括上翼面,下翼面,前缘和后缘。 上翼面包括:前轮廓部分,其具有正的曲率半径,并且设置成从前缘延伸到位于翼弦长度的38%的最大厚度点; 具有正曲率半径的中心轮廓部分,并且被设置成从最大厚度点延伸到对应于翼弦长度的大约90%的位置附近,在该位置处, 距离最大厚度点的翼弦方向的位置和最大厚度点的距离等于或小于0.12; 以及具有负曲率半径的后轮廓部分,并且被设置成从对应于翼弦长度的大约95%的位置的附近延伸到后缘。 前缘结构和翼中心结构之间的耦合部分布置在对应于翼弦长度的大约20%的位置处。 因此,可以最小化由于前缘结构和翼中心结构之间的连接部分之间的间隙和台阶而引起的阻力的增加。