迷宫-刷式密封泄漏流动和摩擦传热特性数值研究  

Numerical Investigations on Leakage Flow and Frictional Heat Transfer Characteristics of Labyrinth-Brush Seal

作　　者：张元桥 李军[2] 谢志毅[1] 邓谷雨[1] ZHANG Yuan-qiao;LI Jun;XIE Zhi-yi;DENG Gu-yu(Institute of Computer Application,China Academy of Engineering Physics,Mianyang 621900,China;Institute of Turbomachinery,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]中国工程物理研究院计算机应用研究所,四川绵阳621900 [2]西安交通大学叶轮机械研究所,陕西西安710049

出　　处：《推进技术》2022年第12期89-99,共11页Journal of Propulsion Technology

摘　　要：为了探究结构参数和运行工况参数对迷宫-刷式密封泄漏流动和摩擦传热特性的影响规律,采用数值求解三维Reynolds-Averaged Navier-Stokes(RANS)方程耦合有限元分析(FEA)的方法,数值研究了围栏高度h_(b),前夹板与转子间隙h_(f),转速n和压比R_(p)对迷宫-刷式密封泄漏流动、温度分布以及转子热应力的作用规律。研究结果表明:刷丝束与转子的摩擦生热使得泄漏流量显著降低;R_(p)和h_(b)对接触式迷宫-刷式密封封严性能有着决定性作用。R_(p)和n升高使得摩擦热流密度和转子最高温升显著增大。h_(b)增大使得摩擦热流密度和转子最高温升先增大后减小;h_(f)增大使得摩擦热流密度先略微增大后减小,转子最高温升逐渐减小;转子最高温升随h_(b)或h_(f)增大的变化趋势取决于摩擦热流密度增幅和气流冷却作用增强幅度的相对大小。转子最高热应力随R_(p)和h_(b)升高而增大,随h_(b)增大而先增大后减小,随h_(f)增大而减小。In order to explore the effects of geometrical parameters and working conditions on the leakage flow and frictional heat transfer characteristics of labyrinth-brush seal,a method of solving the three-dimensional Reynolds-Averaged Navier-Stokes(RANS)equations and coupling with finite element analysis(FEA)is adopted to numerically investigate the influences of fence height(h_(b)),clearance between the front plate and the rotor(h_(f)),rotational speed(n)and pressure ratio(R_(p))on the leakage flow,temperature distribution and rotor thermal stress of a labyrinth-brush seal.The results show that the frictional heat generation between the bristles pack and the rotor significantly reduces the leakage flow rate.R_(p) and h_(b) play a decisive role in sealing performance of the interference labyrinth-brush seal.The increasing R_(p) and n observably increase frictional heat flux and maximum temperature rise of the rotor.The frictional heat flux and the maximum temperature rise of the rotor first increase and then decrease with the increase of the h_(b).While due to the increasing h_(f),frictional heat flux first slightly increases and then decreases,and maximum temperature rise of the rotor gradually decreases.The change trend of the maximum temperature of the rotor with the increase of the h_(b) or the h_(f) depends on the relative magnitude of the increase of frictional heat flux and the increase of air cooling effect.The maximum thermal stress of rotor increases with the increase of R_(p) and h_(b),first increases and then decreases because of the increasing h_(b),and decreases with the increase of the h_(f).

关 键 词：迷宫-刷式密封 泄漏流动 摩擦传热 热应力 数值模拟 

分 类 号：TK474.7[动力工程及工程热物理—动力机械及工程]