Airfoil for high efficiency/high lift fan
    2.
    发明授权
    Airfoil for high efficiency/high lift fan 失效
    翼型用于高效/高提升风机

    公开(公告)号:US4692098A

    公开(公告)日:1987-09-08

    申请号:US787503

    申请日:1985-10-15

    IPC分类号: F04D29/38 F04D25/08 F04D29/68

    摘要: Airfoil for vehicle fan which operates in low Reynolds number and varying turbulent conditions having a discontinuity formed on the suction surface thereof adjacent to its leading edge to trigger early formation of a laminar flow bubble so that sufficient suction surface remains downstream of the air bubble whereby air circumventing the bubble can reattach to the suction surface for sufficient pressure recovery for high lift and low drag performance.

    摘要翻译: 用于车辆风扇的机翼,其工作在低雷诺数和变化的湍流条件下,在其前缘附近在其吸力表面上形成不连续,以触发早期形成的层流气泡,使足够的吸力表面保持在气泡的下游,从而空气 规避气泡可以重新连接到吸力表面,以获得足够的压力恢复,以实现高提升和低阻力性能。

    Area ruled fan blade ends for turbofan jet engine
    3.
    发明授权
    Area ruled fan blade ends for turbofan jet engine 失效
    涡轮风扇喷气发动机的区域划分风扇叶片末端

    公开(公告)号:US5275531A

    公开(公告)日:1994-01-04

    申请号:US55203

    申请日:1993-04-30

    摘要: An axial flow transonic turbofan jet engine includes a hub (26) from which radiate a plurality of rotor blades (50). A casing (12) surrounds and shrouds the rotor blades (50). Part-span dampers (56) are located between adjacent rotor blades (50) in an annular pattern to stiffen the elongated rotor blades (50) during operation. The distal tips (54) of the rotor blades (50) are convexed and spin within a rub strip (62) embedded within the casing (12). The rub strip (62) includes an annularly troughed contour (60) to closely conform with the convex tips (54) of the rotor blades (50). The hub (26) may also include an annularly troughed contour (60) formed along the roots (52) of the rotor blades (50). The annularly troughed contours (60) in the hub (26) and in the casing (12) are radially aligned with the part-span dampers (56) to reduce drag between the casing (12) and the hub (26) caused by the part-span dampers (56) at transonic speeds.

    摘要翻译: 轴流式跨音速涡轮风扇喷气式发动机包括轮毂(26),辐射多个转子叶片(50)。 壳体(12)围绕并围绕转子叶片(50)。 部分跨度阻尼器(56)以环形图案位于相邻的转子叶片(50)之间,以在操作期间加强细长的转子叶片(50)。 转子叶片(50)的远端(54)在嵌入壳体(12)内的摩擦带(62)内凸起并旋转。 摩擦条(62)包括与转子叶片(50)的凸形尖端(54)紧密一致的环形凹陷轮廓(60)。 毂(26)还可以包括沿着转子叶片(50)的根部(52)形成的环形凹陷轮廓(60)。 轮毂(26)和壳体(12)中的环形齿状轮廓(60)与部分跨度阻尼器(56)径向对准,以减少壳体(12)和轮毂(26)之间的阻力, 跨度阻尼器(56)。