螺旋槽止推气体轴承承载能力的数值分析

摘要

The distribution of air film pressure fields was solved by using computational fluid dynamics software,and the simulation method proposed was validated by comparison of the calculation data of loading force with published results.The effects of the number of grooves,the spiral angle,the groove depth,the ratio of groove length and width on the loading force were investigated.The results indicate that a high pressure area is observed as the gas flowing through the groove is com-pressed,which eventually forms the loading force.The loading force is increased gradually and tends to a constant value with the number of grooves increased,and there is an optimum value for the spiral angle,the groove depth,the ratio of groove length and width to make the loading force the maximum.%运用Fluent流体计算软件，求解螺旋槽止推气体轴承气膜压力分布，将计算得到的承载力与文献结果进行比较，验证计算方法的正确性。分析螺旋槽槽数、螺旋角、槽深、槽长比及槽宽比对轴承承载力的影响。结果表明：在槽区气体因受到压缩存在高压区并因此形成承载力；随着槽数的增加承载力逐渐增大并趋于定值；而对于螺旋角、槽深、槽长比和槽宽比，均存在最佳值使承载力最大。