冲角对高负荷正弯叶栅壁面静压影响的实验研究  

Experimental Study of the Effect of an Incidence on the Wall-surface Static Pressure of a High-load Positively-bent Cascade

作　　者：陈绍文 卞兆喜 刘顺隆[1] 

机构地区：[1]哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨150001 [2]哈尔滨哈电电气公司,黑龙江哈尔滨150001

出　　处：《热能动力工程》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)

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.

关 键 词：高负荷叶栅 正弯曲 冲角 静压 

分 类 号：TK474.8[动力工程及工程热物理—动力机械及工程]