|关键词: 组合压气机 确定性动能 非定常 尾迹 势流
|Superposition of Influences from Wake and Potential Field with Equal and Unequal Frequency in an Axial-Radial Combined Compressor
ZHAO Ben1, YANG Ce1, LAO Da-zhong2, ZHANG Wei-zheng1
1.School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;2.School of Aerospace Scientific Engineering, Beijing Institute of Technology, Beijing 100081, China
|A numerical investigation in an axial-radial combined compressor was performed to study the superposition of rotor/stator and stator/rotor interaction and to indicate the variations of the flow angle at inlet of the downstream rotor. Three configurations, R/S/R rig with unequal moving blade numbers, R/S rig and R/S/R rig with identical moving blade numbers, were included in this research project. Efforts were focused on the superposed interaction in the stator channel, specifically the changes in the deterministic kinetic energy caused by changing blade numbers and rotor clocking. Besides, a useful mathematical model for analyzing these changes was presented. Results show that, for the compressor with unequal moving blade numbers, the position of the excitation/suppression changes with time whereas it keeps fixed position for the rig with identical moving blade numbers. But the position can be modulated by clocking when the rotors have equal blade numbers. In addition, the blade numbers and clocking position also decide the inlet flow angle for downstream radial rotor.
|Key words: Axial-radial combined compressor Deterministic kinetic energy Unsteady Wake Potential field