提高四冲程点燃式重油航空发动机抗爆性措施

Measures to improve anti-knock quality for four-stroke ignited kerosene aviation engine

应用GT-Power软件,对某四冲程点燃式航空活塞增压发动机进行使用不同燃料的一维性能仿真分析,针对低辛烷值燃料易发生爆震的特性,分别采用添加抗爆添加剂、调整发动机的压缩比、增压压力、空燃比、缸径、点火提前角等参数,在抑制爆震的前提下尽可能实现发动机功率恢复。将原93#汽油燃料换成辛烷值为61的特种煤油燃料后,在不扩大气缸直径和扩大气缸直径两种方案下,发动机功率恢复分别达到原型机的89%和95%,油耗率分别增加5.4%和6.1%,排气温度分别提高11.4%和13.4%。

A one-dimensional performance simulation for a four-stroke ignited turbocharging aviation engine with different fuels was made by an engine performance simulation software GT-Power to optimize the anti-knock quality.Through the reasonable adjustment of the compression ratio,boost pressure,air-fuel ratio,cylinder diameter,ignition timing,knock tendency of the engine using the new fuel was optimized,and engine＇s main output parameters were roughly maintained.When replacing the No.93 gasoline fuel with a new type fuel of 61 octane number,the power can reach 89% of the original power output after using the method without expanding the diameter of the cylinder and 95% after using the method of expanding the diameter of the cylinder;the specific fuel consumption increased about 5.4% and 6.1%,respectively;and the exhaust temperature increased about 11.4% and 13.4%,respectively.