摘要
某型航空发动机在停车后的冷却过程中,其高压转子会产生较大的热弯曲。当再次启动时,高压转子产生较大的热振动,进而威胁到发动机的安全运行。采用流-热-固-动力学开放式半耦合系统,对停车后不同时刻的瞬态温度场对某航空发动机高压转子系统的瞬态热启动特性的影响进行了探讨并和试验值进行了比较。结果表明,高压转子的停车时间位于65min～90min时,其转子的最大振速超过了最大临界安全振速80mm/s,因此热启动时应当尽量避开这一时间段,或者在这一时间段冷运转后再启动减小热弯曲对瞬态振动的影响。计算结果为航空发动机高压转子系统的优化设计和热弯曲故障诊断提供了理论依据。
Great thermal bending in an aeroengine,especially in high pressure(HP)rotor,is existing frequently in course of cooling after parking.When the rotor system starts up again,it brings relative big thermal vibrations which threaten the safe operation of the aeroengine.Here,the thermal vibration characteristics of a HP rotor system of a certain aeroengine were studied by means of the coupling theory of flow-thermal-structure-dynamics.The effect of temperature in different parking times on the dynamic characteristics of the HP rotor was discussed.At same time the caculated results were compared with experiment data.The results showed that during 65～90min of parking period,the maximum vibration velocity ofthe HP rotor exceeded the critical safe vibration velocity of 80mm/s.So when the rotor starts up after parking,it should avoid the period of 65 ～90min after parking to minish thermal vibration.Or after a cooling running,the rotor starts up again.The calculated results were references for design and fault diagnosis of HP rotors to avoid thermal vibra-tion.
出处
《振动与冲击》
EI
CSCD
北大核心
2009年第7期33-37,共5页
Journal of Vibration and Shock
基金
国家高技术研究发展计划(863计划)项目(2006AA04Z408)
国家自然科学基金资助项目(50275024)
关键词
航空发动机
高压转子系统
瞬态热振动
数值模拟
aeroengine
high pressure(HP)rotor system
transient thermal vibration
multiple fields coupling
