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在飞机的方案论证阶段以及尔后飞机与发动机的性能匹配过程中都需要知道桨扇发动机的性能。本文主要讨论桨扇发动机性能的预测方法,并给出计算得到的飞行特性和转速特性。 一、设计点的选取 1.桨扇发动机设计点 起飞和巡航是运输机的主要飞行任务。发动机的尺寸主要也是根据这两个飞行任务选取。以往,涡扇发动机是将海平面上的起飞条件作为设计点,只要起飞推力够了,巡航推力一定满足。但桨扇发动机由于函道比较大(>50),推力随马赫数下降很快,一般选10000米高度上的巡航马赫数作为设计点。
The performance of the paddle fan engine needs to be known both during the aircraft demonstration phase and afterwards in the performance matching between the aircraft and the engine. This paper mainly discusses the prediction method of the performance of the propeller fan engine, and gives the calculated flight characteristics and speed characteristics. First, the selection of design points 1. Paddle fan engine design Take-off and cruise is the transport aircraft’s main mission. The size of the engine is also based on these two missions selected. In the past, the turbofan engine is the take-off conditions at sea level as a design point, as long as the lift thrust enough, cruise thrust must meet. However, because of the relatively large propeller fan engine (> 50), the thrust decreases rapidly with the Mach number, generally selected cruise Mach number 10000 meters as the design point.