高 翔.分排涡扇发动机冲刷阻力对标准净推力影响的数值计算[J].航空发动机,2023,49(2):99-104
分排涡扇发动机冲刷阻力对标准净推力影响的数值计算
Numerical Calculation of the Influence of Scrubbing Drag on Standard Net Thrust forSeparate-flow Turbofan Engine
  
DOI:
中文关键词:  分排涡扇  安装推力  标准净推力  冲刷阻力  控制体  数值计算  航空发动机
英文关键词:separate-flow turbofan  installed thrust  standard net thrust  scrubbing drag  control volume  numerical calculation  aeroengine
基金项目:航空动力基础研究项目资助
作者单位
高 翔 中国飞行试验研究院西安 710089 
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中文摘要:
      为了确定分排涡扇发动机短舱、吊挂及内、外涵排气尾流造成的冲刷阻力,明确其对发动机标准净推力的影响,以某分 排涡扇发动机为研究对象,选取控制体对发动机内、外部冲刷阻力及安装推力进行受力分析,开展不同飞行状态及不同发动机状 态下的数值仿真计算,总结各类冲刷阻力的影响因素及变化趋势,在发动机标准净推力的基础上给出了安装推力的计算结果。结 果表明:分排涡扇发动机的冲刷阻力主要来源于被排气尾流浸润的吊挂、内涵喷管外壁面、内涵排气中心锥、外部吊挂及短舱冲刷 阻力,各部分冲刷阻力随飞行高度、飞行马赫数及发动机状态变化而变化;在发动机大状态下,冲刷阻力造成的推力损失可达2%~ 3%;在慢车状态下,冲刷阻力造成的推力损失可达10%以上。
英文摘要:
      In order to determine the scrubbing drag caused by the nacelle,pylon,core/bypass exhaust flow of separate-flow turbofan engines,and clarify the influence on the standard net thrust,control volume was set up for force analysis on the internal/external scrub? bing drag,installed net thrust for a separate-flow turbofan engine. Then numerical investigations were conducted under different flight con? ditions and engine power settings,and the influencing factors and variation trends of different scrubbing drags were summarized. Finally, the calculation result of installed net thrust was given on the basis of standard net thrust. The results show that the scrubbing drag of the separate-flow turbofan engine mainly comes from the pylon wetted by the exhaust flow,the outer surface of the core cowl,the exhaust plug,the external pylon,and the nacelle scrubbing drag. The scrubbing drag of each part varies with the flight altitude,the flight Mach number,and the engine status. Under high power settings,the scrubbing drag can reach 2% to 3% of standard net thrust,and under idle conditions,the scrubbing drag can reach more than 10% of standard net thrust.
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