Geared Turbofan Engine Having a Reduced Number of Fan Blades and Improved Acoustics
    12.
    发明申请
    Geared Turbofan Engine Having a Reduced Number of Fan Blades and Improved Acoustics 审中-公开
    具有减少风扇叶片数量和改进声学的齿轮涡轮风扇发动机

    公开(公告)号:US20160003049A1

    公开(公告)日:2016-01-07

    申请号:US14769408

    申请日:2014-02-21

    CPC classification number: F01D5/141 F05D2220/36 Y02T50/671 Y02T50/673

    Abstract: A rotor blade comprises an airfoil extending radially from a root section to a tip section and axially from a leading edge to a trailing edge, the leading and trailing edges defining a curvature therebetween. The curvature determines a relative exit angle at a relative span height between the root section and the tip section, based on an incident flow velocity at the leading edge of the airfoil and a rotational velocity at the relative span height. In operation of the rotor blade, the relative exit angle determines a substantially flat exit pressure ratio profile for relative span heights from 75% to 95%, wherein the exit pressure ratio profile is constant within a tolerance of 10% of a maximum value of the exit pressure ratio profile.

    Abstract translation: 转子叶片包括从根部到尖端部分径向延伸并且从前缘到后缘的轴向延伸的翼型件,前缘和后缘在它们之间限定曲率。 基于在翼型的前缘处的入射流速和在相对跨度高度处的旋转速度,曲率确定根部和尖端部分之间相对跨度高度处的相对出射角。 在转子叶片的操作中,相对出口角度确定了从75%到95%的相对跨度高度的基本上平坦的出口压力比分布,其中出口压力比分布是恒定的,在公差范围内的最大值的10% 出口压力比。

    Low pressure ratio fan engine having a dimensional relationship between inlet and fan size

    公开(公告)号:US11286811B2

    公开(公告)日:2022-03-29

    申请号:US16391476

    申请日:2019-04-23

    Abstract: According to an example embodiment, a gas turbine engine assembly includes, among other things, a fan section including a fan, the fan including a plurality of fan blades, a diameter of the fan having a dimension D that is based on a dimension of the fan blades, each fan blade having a leading edge, and a forward most portion on the leading edges of the fan blades in a first reference plane, a geared architecture, a turbine section including a high pressure turbine and a low pressure turbine, the low pressure turbine driving the fan through the geared architecture, a nacelle surrounding the fan, the nacelle including an inlet portion forward of the fan, a forward edge on the inlet portion in a second reference plane, and a length of the inlet portion having a dimension L measured along an engine axis between the first reference plane and the second reference plane. A dimensional relationship of L/D is between 0.20 and 0.40.

    Variable area fan nozzle for gas turbine engine

    公开(公告)号:US10808648B2

    公开(公告)日:2020-10-20

    申请号:US14472849

    申请日:2014-08-29

    Abstract: A nacelle assembly according to an exemplary aspect of the present disclosure includes, among other things, a core nacelle defined at least partially about a core engine, a fan nacelle mounted at least partially around the core nacelle to define a fan bypass flow path, and a variable area fan nozzle in communication with the fan bypass flow path. The variable area fan nozzle has a first fan nacelle section and a second fan nacelle section downstream of the first fan nacelle section. The first fan nacelle section and the second fan nacelle section are axially movable relative to one another to define an auxiliary port to vary a fan nozzle exit area and adjust fan bypass airflow. The auxiliary port is defined between the first fan nacelle section and the second fan nacelle section. The first fan nacelle section comprises a first acoustic system which provides an acoustic impedance configured to attenuate a noise characterized by a leading edge of the second fan nacelle section. The first acoustic system is defined at least in part within a trailing edge region of the first fan nacelle section. A method of reducing a total effective perceived noise level of a gas turbine engine with a variable area fan nozzle is also disclosed.

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