特种车辆涡轮增压器内部流动特性分析

涡轮增压器是特种动力装备的重要动力部件，良好的密封是保证涡轮增压器正常工作的关键因素，而叶轮高速运转引发的压力不均则是泄漏的重要原因.基于流体力学分析方法建立有限元模型，研究了一种离心泵式密封结构的内部流场分析及流动特性，探讨了压气机端泄漏量、内部压力在不同转速和窄隙出口负压等工况下的变化规律，验证了该密封结构的油气密封性能.结果表明，受高速离心效应影响，该密封结构具备良好的防止压气机端漏油效果，高速运转时会产生漏气.研究结果为改进涡流增压器密封结构提供了参考依据.

Analysis on Internal Flow Characteristics of Special Vehicle Turbocharger

Turbocharger is an important power component of special power equipment. Better sealing is the key factor to ensure the normal operation of the turbocharger. Uneven pressure caused by high speed operation of the impeller is usually an important cause of leakage. Based on the fluid mechanics analysis method, a finite element model was established. The internal flow field analysis and flow characteristics of a centrifugal pump seal structure were studied. The variations of compressor leakage and internal pressure at different speeds and narrow outlet negative pressure were discussed. The sealing performance of the seal structure was verified. The results show that the sealing structure has a good effect of preventing oil leakage at the compressor end due to high-speed centrifugal effect, and leakage occurs at high speed. The research results provide reference for improving the sealing structure of vortex booster.