爬升阶段涡扇发动机核心流道吸鸟适航审定

Airworthiness certification of turbo fan engine core duct bird ingestion during climbing phase

研究涡扇发动机核心流道吸鸟对发动机的影响,分析核心流道吸鸟与风扇叶片鸟击的损伤模式及关键要素的差异。采用光滑粒子流体动力学方法开展某发动机风扇增压级内涵的吸鸟数值模拟,研究吸鸟位置、鸟速和风扇转速等关键参数对鸟体碎片轨迹及质量分布的影响,确定核心流道吸鸟最严苛工况条件。结果显示:鸟撞击进口导流叶片中心位置时鸟体切片质量较大;在较高鸟速和较低风扇转速下进入内涵的鸟体切片质量较大。研究结果支撑了某型涡扇发动机核心流道吸鸟专用条件的制定,要求在典型的爬升阶段允许的最大爬升速度以及最小风扇转速条件下开展吸鸟试验,同时试验用到的这只鸟的撞击位置应该使吸入核心流道的鸟的质量最大。

The effect of core duct bird ingestion on turbo fan engine was analyzed,the differences of damage mode and key factors between core duct bird ingestion and fan blade bird strike were determined.Core duct bird ingestion was simulated by using smooth particle hydrodynamic method to study the impact of bird ingestion location,bird ingestion velocity and fan rotor speed.The critical parameter of the most severe operating conditions for core duct bird ingestion was determined.The results showed that the center of the inlet guide vane was the most critical position which led more bird ingested.At higher bird ingestion speed and lower fan speed,the mass of the bird body slices entering the inner duct was greater.The research results support the formulation of special conditions for the core duct bird ingestion of a certain turbo fan engine.The bird ingestion test should be carried out under the conditions of the minimum fan speed at maximum climbing speed in the typical climbing stage,at the same time,the impact position of the bird used in the test should maximize the mass of the bird ingesting into the core duct.