双发布局短距/垂直起降飞机外流气动特性研究

External flow field aerodynamic characteristics of twin-engine S/VTOL aircraft

针对YAK-141和F-35B两种不同推进系统构型的短距/垂直起降飞机,利用流场仿真软件,研究了双发布局短距/垂直起降飞机,分别采用升力发动机+转向喷管和升力风扇+转向喷管推进系统构型时,飞机短距/垂直起降工况下的外流气动特性,包括高温燃气回吸、地面效应和环境影响等。结果表明,升力风扇+转向喷管推进系统构型的短距/垂直起降飞机,在高温燃气回吸和环境影响等方面具有一定的优越性;不同推进系统构型的短距/垂直起降飞机,在短距/垂直起降时存在不同的喷泉流,其位置和气动特性对机身下表面的温度和压力分布有影响。

For YAK-141 and F-35B short/vertical take off landing(S/VTOL) aircraft with different propulsion configurations, flow field simulation software was used to study the external flow field aerodynamic characteristics of twin-engine S/VTOL aircraft with different propulsion systems of ‘lift engine + steering nozzle’ and ‘lift fan + steering nozzle’ under vertical take-off and landing conditions,including high temperature gas suction, ground effect and environmental impact. The results show that the S/VTOL aircraft of the ‘lift engine+steering nozzle’ propulsion system configuration has certain superiority in the aspects of high temperature gas suction and environmental impact;different propulsion configurations of S/VTOL has different fountain flow during vertical landing, and their position and aerodynamic characteristics have an impact on the temperature and pressure distributions on the lower surface of the fuselage.