摘要
实验研究了冲角对某高负荷环形正弯扩压叶栅壁面静压的影响,结果表明,正冲角时直叶栅吸力面具有趋势明显的反"C"型压力分布,这种分布趋势随弯角增大而增强,并导致低能流体向叶展中部的积聚逐渐增多;由于吸力面具有较强的流向逆压梯度,叶展中部气流易分离,从而致使损失激增;在高负荷压气机叶栅中,负冲角和零冲角时采用正弯曲设计对减小分离、降低损失的效果要好于正冲角时,且弯曲角度不宜太大。
An experimental study has been conducted of the effect of an incidence on the wall surface static pressure of a high-load annular positively-bent diffusion cascade.The results of the study show that when the incidence is positive,the suction surface of a straight-blade cascade exhibits an evident tendency of reverse 'C' shaped pressure distribution,which will be intensified with an increase of the bending angle and result in a gradual accumulation of low-energy fluid in the middle of the blade span.Due to a relatively strong reverse pressure gradient streamwise on the suction surface,the air flow in the middle blade span is prone to be separated,thus causing a sharp increase of losses.In a high-load compressor cascade,when the incidence is negative and zero,the adoption of a positively-bent blade design will lead to a better effectiveness in reducing separation and losses than in the case when the incidence is positive.In addition,an excessively large bending angle should be avoided.
出处
《热能动力工程》
EI
CAS
CSCD
北大核心
2008年第5期468-472,553,共5页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金资助项目(50236020)
关键词
高负荷叶栅
正弯曲
冲角
静压
experimental study,high-load cascade,positive bending,incidence,static pressure
