跨声压气机动叶弯、掠对静叶静压脉动的影响

Effect of bowed and swept rotors on stator pressure fluctuation in a transonic compressor

对一单级跨声压气机采用了三种弯、掠动叶后设计工况下的非定常流场分别进行了数值模拟,分析了动叶弯、掠对下游静叶表面静压非定常脉动的影响.研究结果表明:三种弯、掠动叶都减轻了静叶前缘顶部和根部的静压脉动,使静叶前缘所受到的静压扰动沿径向分布更为均匀,尤其是弯掠动叶的作用最为明显;除去叶片前缘区域,三种弯、掠动叶对下游静叶的顶部压力面和吸力面的扰动都有所减弱,仍然以弯掠动叶的作用最为显著,而在静叶的中部和根部前缘区域之外的表面,动叶的弯、掠对压力扰动的影响不明显.

The unsteady 3-D flow fields in a transonic compressor at design point were simulated numerically to study the effect of the bowed and swept rotors on stator surface static pressure fluctuation.The results show that,all three types of bowed or swept rotors,especially the bowed-swept rotor,could weaken the static pressure fluctuation on the top and bottom of stator leading edge compared with the baseline.As a result,the stator surface pressure fluctuation near leading edge area becomes more uniform in radial direction.Expect for the stator leading edge area,the amplitude of pressure fluctuation decreases on the top of pressure and suction surface downstream the bowed and swept rotors,but the effect at mid-span and hub is insignificant.