Airworthiness certification of turbo fan engine core duct bird ingestion during climbing phase
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摘要:
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。
Abstract: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.
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Key words:
- turbo fan engine /
- core duct /
- inner duct /
- bird ingestion /
- airworthiness
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表 1 不同撞击位置进入内涵鸟体质量计算结果
Table 1. Bird mass entering into inner duct at different impact positions
编号 内涵吸鸟质量/kg LOC-1 0.76 LOC-2 0.80 LOC-3 0.83 表 2 不同鸟速下的吸鸟工况
Table 2. Bird ingestion conditions at different bird velocities
工况 鸟的种类 鸟速/(m/s) 风扇转速/(r/min) 1 中鸟 130 3 250 2 中鸟 100 3 250 3 中鸟 75 3 250 4 中鸟 50 3 250 表 3 各工况下鸟体切片的质量
Table 3. Mass of bird slice on each condition
工况 质量/g 第一切片 第二切片 第三切片 1 232.1 809.9 767.4 2 183.2 631.3 590.1 3 137.4 478.2 440.7 4 88.5 317.2 253.9 表 4 不同风扇转子转速吸鸟仿真工况
Table 4. Simulation conditions for bird ingestion at different fan rotor velocities
工况 鸟速/(m/s) 风扇转速/(r/min) 代表工况 1 130 3750 起飞 2 130 3250 减推力爬升 3 130 2750 巡航 4 130 2250 进场慢车 表 5 鸟体切片的质量
Table 5. Mass of bird slice
工况 质量/g 第一切片 第二切片 第三切片 1 208.8 693.2 666.4 2 232.1 809.9 767.4 3 263.8 942.0 905.4 4 313.4 1 135.9 916.1 -
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