旋转冲压发动机高速动静混合气体轴承性能分析

Performance analysis of high-speed hybrid gas bearings for rotating ramjet

关键词:  动静混合气体轴承  有限差分法  牛顿迭代  承载能力

Key words:  Hybrid gas bearings  Finite difference method  Newton method  Load capacity

摘要:

为了满足旋转冲压发动机对高速支撑的要求,本文对动静压混合高速气体轴承进行理论分析与数值研究。首先通过旋转冲压发动机的工作条件确定了气体轴承的供气压力,对描述轴承内气体流动的雷诺方程采用牛顿迭代与有限差分法进行求解,获得不同偏心、不同转速下轴承内气体压力分布并分析动静压耦合机理。同时分析了不同供气孔排数对压力分布与承载能力的影响,给出了不同转速、不同供气孔排数下轴承所能支撑的最大转子重量,为下一步旋转冲压发动机转子系统设计奠定基础。

Abstract:

The performance of high-speed hybrid gas bearings for rotating ramjet was studied theoretically and numerically to fulfill the requirement of bearing support for rotating ramjet.The gas supply pressure was determined firstly by the work condition of the rotating ramjet.By employing the Newton method and finite difference method,the Reynolds equations for the gas flow in the bearings were solved.The pressure distributions of the hybrid bearings with different eccentricities and rotating speed were obtained and the coupling mechanics of aerostatic and aerodynamic was analyzed.And also the number of orifices sets,which has effect on the pressure distribution and load capacity,was discussed.The maximum rotor weights for different rotating speeds and orifices set numbers,which the hybrid gas bearings could provide,were listed to establish the foundation for the design of rotating ramjet rotor system.