公开(公告)号：US20070276601A1

公开(公告)日：2007-11-29

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： G06F19/00

CPC分类号： G01L5/133 ,  G01M15/14

摘要： In a method for determining the free field thrust of a gas turbine engine the gas turbine engine is attached to a movable support means in an enclosed gas turbine engine test facility, and is operated at a selected engine operating point. The thrust applied by the engine to the thrust cradle is measured via thrust measurement means. Calculations are performed to determine 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 means of the thrust cradle, the base drag generated as a result of accelerating nozzle ejector airflow, a pre-stream tube 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. Also forces due to forward anemometer plane and nozzle static pressures and a nozzle exit buoyancy force and determined, and all of these forces are summed according to their respective positive and negative values to determine the free field thrust of the engine at the selected engine operating point.

摘要翻译： 在用于确定燃气涡轮发动机的自由场推力的方法中，燃气涡轮发动机附接到封闭的燃气涡轮发动机测试设备中的可移动支撑装置，并且在选定的发动机工作点操作。 发动机施加到推力支架上的推力通过推力测量装置测量。 执行计算以确定由气流进入燃气涡轮发动机进气口产生的燃气涡轮发动机进气动量阻力，由气流通过推力支架的可移动支撑装置产生的推力支架拖曳力，由于加速喷嘴产生的基础阻力 喷射器气流，与进气通道中的流线的转动相关的预流管力，与喇叭口拉脱力相关的预流管力。 还由于前风速计平面和喷嘴静压力和喷嘴出口浮力而产生的力并确定，并且所有这些力根据它们各自的正值和负值相加以确定发动机在所选择的发动机工作点处的自由场推力 。