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    Thrust correction
    3.
    发明授权
    Thrust correction 有权
    推力校正

    公开(公告)号：US07565269B2

    公开(公告)日：2009-07-21

    申请号：US11802507

    申请日：2007-05-23

    申请人： Robert N Parfitt ,  Martin R Turville ,  Maurice C Bristow ,  Stephen G Brown

    发明人： Robert N Parfitt ,  Martin R Turville ,  Maurice C Bristow ,  Stephen G Brown

    IPC分类号： G01M15/00 ,  G06F19/00

    CPC分类号： G01L5/133 ,  G01M15/14

    摘要： To determine free field thrust of a gas turbine engine, the gas turbine engine may be attached to a movable support, and operated at a selected engine operating point. The thrust applied by the engine to the thrust cradle is measured. The gas turbine engine intake momentum drag generated by airflow into the gas turbine engine intake, the thrust cradle drag force generated by airflow past the moveable support of the thrust cradle, the base drag generated as a result of accelerating nozzle ejector airflow, a pre-streamtube force related to turning of stream lines in the intake air path, a pre-stream tube force related to a bell mouth pull-off force are calculated. Forces due to forward anemometer plane and nozzle static pressures, and a nozzle exit buoyancy force are summed according to respective positive and negative values to determine the free field thrust at the selected engine operating point.

    摘要翻译： 为了确定燃气涡轮发动机的自由场推力，燃气涡轮发动机可以附接到可移动支撑件，并且在选定的发动机工作点操作。 测量由发动机施加到推力支架上的推力。 燃气涡轮发动机进气动量阻力由气流引入燃气轮机发动机进气口，推力支架产生的气流通过推力支架的可动支撑产生的拖曳力，由于加速喷嘴气流而产生的底座阻力， 计算与进气通道中的流线的转动相关的流动力，计算与喇叭口拉脱力相关的预流管力。 由于正向风速计平面和喷嘴静压力引起的力和喷嘴出口浮力根据相应的正值和负值相加，以确定所选发动机工作点的自由场推力。