气浮空气循环机密封轴向气动力研究

Research on Sealing Axial Aerodynamics of Air Flotation Air Circulation Machine

针对传统空气循环机双侧高速转子端的轴向力理论经验公式精度偏低,数值计算耗时长的问题,建立包含双侧高速转子的窄缝间隙计算域几何模型,并通过试验校核了模型的准确性。对含双侧高速转子的窄缝间隙内部流场进行数值计算,探讨窄缝间隙对轴向气动力的作用规律,并对传统机械轴向气动力的计算公式进行修正,提出适用于气浮ACM轴向气动力计算公式。结果表明:提出的公式在压气机端的最小误差由原来的59%降低到13%,最大误差由原来的261%降低到75%,在涡轮端最小误差由原来的63%降低到2%,最大误差由原来的98%降低到8%,表明修正后轴向气动力公式减小了轴向力的计算误差,因此提出的公式更加适用于气浮空气循环机的轴向气动力计算。

In view of the low accuracy of the theoretical empirical formula of axial force at the double-sided high-speed rotor end of the traditional air circulation machine,the numerical calculation takes a long time,this paper establishes a narrow gap calculation domain geometric model including double-sided high-speed rotor,and checks the accuracy of the model through experiments.On the basis of axial aerodynamic generation,the axial force is compared and calculated by theoretical formula method and CFD numerical calculation method.Based on the numerical simulation results of axial force,the calculation formula of axial force on the back side of the existing wheel is partially corrected,and a new set of axial aerodynamic calculation formula suitable for air flotation ACM is proposed,and the results show that the minimum error at the compressor end is reduced from 59% to 13% of the original formula,the maximum error is reduced from 261% to 75% of the original formula,the minimum error at the turbine end is reduced from 63% to 2% of the original formula,and the maximum error is reduced from 98% to 8% of the original formula.The new calculation method greatly reduces the error value of the axial force and aims to solve the problem that plagues the engineering side of how to accurately calculate the pneumatic axial force.