民用飞机反推力格栅出流模式设计与试验

通过给定各块格栅上气流的折流角,反推力格栅出流模式描述了反推气流方向沿发房周向的分布。出流模式的定义需要考虑使反推系统满足反推效率,重吸入特性和有效面积方面的要求,还应使反推气流对机体气动特性的影响最小化。格栅出流模式设计是否满足反推效率和有效面积的要求,可由单独反推系统的静态试验来进行验证,而重吸入特性和发动机/飞机气动干扰则必须通过全机反推力风洞试验来进行考察。

Design and Test of Cascade Efflux-pattern for Civil Aircraft Thrust Reversers

By defining the deflection angles of exhaust flow on each cascades, efflux-pattern describes the circumferential distribution of the exhaust flow from the thrust reverser around a nacelle. The determination of the efflux pattern must take into account the requirements for efficiency, re-ingestion characteristics and effective area,as well as the impact imposed by the exhaust flow on the aircraft aerodynamic characteristics. Whether or not certain efflux design provides sufficient thrust efficiency and effective area can be evaluated by separate thrust reverser static test while re-ingestion characteristics and engine/aircraft aerodynamic interference can only be studied in an installed wind tunnel test.