摘要
某型涡扇发动机插板式进气畸变实验中,当插板升高到35%以上,进气截面各个测点畸变扰动出现约为32 Hz大幅振荡.用气流压力波动方程计算了进气道容腔谐振频率为34 Hz.表明该谐振是由插板与发动机之间的容腔引起的.不同转速和流量下,计算和实验的结果都基本稳定.由分析可知:150 Hz以下脉动压力是大幅稳定和周期性的.高频部分主要是小幅随机压力脉动,其速率和加速度变化比较剧烈.在发动机喘振前,谐振频率压力振荡能量大大增加,其它低频和高频成分能量迅速减少,形成典型的谐振型压力振荡.
Some observations from measuring the inserted-board airflow inlet distortion dynamic pressure field were presented in this paper.When the inserted-board rose above 35%,the inlet airflow disturbance occurred at about 32Hz.The pressure wave equation calculation shows that the Phase1 syntonic frequency is 34Hz.This syntony lies between the engine and inserted-board.Its frequency is steady at different rotor speeds and fluxes.The follow-on analysis indicates that the low frequency pulse pressure of component be...
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2009年第9期2057-2062,共6页
Journal of Aerospace Power
关键词
动态进气畸变
发动机
扰流插板
谐振
低频
喘振
dynamic air inlet flow distortion
engine
disturbed inserted-board
syntony
low frequency
surge
