齿间浅槽结构对直通篦齿封严特性影响的实验  

Experiments of leakage effects of rub-grooves on straight-through labyrinth seals

作　　者：纪国剑[1] 吉洪湖[2] 王政伟[1] 

机构地区：[1]常州大学机械与能源工程学院,常州213016 [2]南京航空航天大学能源与动力学院,南京210016

出　　处：《航空动力学报》2011年第3期558-562,共5页Journal of Aerospace Power

摘　　要：在早期研究的结果上,提出了一种齿间浅槽结构的直通齿衬套,即在与篦齿齿腔正对的衬套上加工制成浅槽.这种齿间浅槽破坏了壁面射流附面层的轴向连续性,导致射流流经浅槽后向篦齿齿腔发生小角度偏转,这样能有效地降低直通篦齿的透气效应,进而降低泄漏量.实验结果表明,相比于传统的光滑衬套,浅槽泄漏系数显著降低,其中矩形浅槽下降15%,平行四边形浅槽下降30%,封严性能大大提高,这进一步说明迎来流方向,较小的迎风角有利于射流偏转,而当射流离开浅槽时,较大的开槽角度增加了射流的流动阻力,更利于射流的偏转.Based on early studies,a straight-through labyrinth seal was developed,which has a bush with a rub-groove machined opposite the teeth cavity.The rub-groove manufactured on the smooth bush opposite to the tooth cavity destroys the continuity of the wall jet boundary layer,which lead to the jet flow change it direction and greatly improve sealing effect.The experimental studies show that it has a better sealing effect.The leakage coefficient of labyrinth seal with the rectangle rub-grooves is decreased 15% and the parallelogram rub-grooves 30%.Little windward angle of rub-grooves leads to jet deflection and big leeward angle of rub-grooves is beneficial to increase the resistance of the jet and also leads to jet deflection.

关 键 词：直通篦齿 衬套 壁面射流 齿间浅槽 泄漏系数 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]