CAJ | 학술논문

对带直板式浮升力垫片的指式封严的浮升力特性进行数值分析，探讨转子表面线速度、封严间隙和进出口压差对浮升力垫片下表面的压力分布及浮升力和浮升力系数的影响。研究的封严结构由两层封严片（每层周向有72个指）组成，计算时将包含一个完整的浮升力垫片和其相邻间隙的三维扇区模型作为计算域，并将封严片组处理为多孔介质。研究结果表明：进出口压差越大，浮升力越大；浮升力随封严间隙的增大而减小；转子表面线速度增大，浮升力缓慢增大；浮升力系数随进出口压差的增大而减小；浮升力系数随封严间隙的增大而减小；转子表面线速度增大，浮升力系数减小，封严间隙越小这种趋势越明显。
대대직판식부승력점편적지식봉엄적부승력특성진행수치분석，탐토전자표면선속도、봉엄간극화진출구압차대부승력점편하표면적압력분포급부승력화부승력계수적영향。연구적봉엄결구유량층봉엄편（매층주향유72개지）조성，계산시장포함일개완정적부승력점편화기상린간극적삼유선구모형작위계산역，병장봉엄편조처리위다공개질。연구결과표명：진출구압차월대，부승력월대；부승력수봉엄간극적증대이감소；전자표면선속도증대，부승력완만증대；부승력계수수진출구압차적증대이감소；부승력계수수봉엄간극적증대이감소；전자표면선속도증대，부승력계수감소，봉엄간극월소저충추세월명현。
The lifting-force characteristics of finger seal with flat lifting-pad were analyzed by numerical simulation,and the effects on pressure distribution of the lower surface of lifting-pads,lifting-force and lifting-force coefficient by the rotor speed,clearance of finger seal and pressure drop were investigated.The seal structure was consisted of two slice layers with 72 fingers per layer around its circumference,which were treated as the porous medium,and the three-dimensional (3-D)computation model included one lifting-pad and its nearby clearance.The research results indicate that the lifting-force is increased with the increase of pressure drop,and decreased with the increase of seal clearance,and increased slowly with the increase of rotor speed.The lifting-force coefficient is decreased with the increase of pressure drop,and decreased with the increase of seal clearance.Along with the increase of rotor speed,the lifting-force coefficient is de-creased,especially when the seal clearance is smaller.