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采用基于两控制容积Bulk Flow理论和可压缩理想气体模型开发的计算程序对孔型密封转子的动力特性进行了分析,计算了在不同进口预旋、密封间隙和孔深时孔型密封转子的动力特性系数,并将其与已有的实验数据进行了比较.结果表明:增大进口预旋会使有效刚度和有效阻尼减小,交叉刚度增大,对转子稳定性不利;过大或过小的密封间隙尺寸均对孔型密封的总体性能不利;孔型密封的有效刚度和穿越频率对孔深的变化不敏感,但有效阻尼随孔深的减小而显著增大.计算结果与实验值吻合良好.
The dynamic characteristics of a sealed rotor with a hole are analyzed by using a calculation program developed on the basis of two Bulk Volume Theory and a compressible ideal gas model. The dynamic characteristics of a sealed rotor with different inlet pre-rotation, seal clearance and hole depth are calculated. The results show that increasing the pre-rotation of the inlet decreases the effective stiffness and the effective damping and increases the cross-rigidity, which is unfavorable to the stability of the rotor. The oversize or undersize Of the seal gap size are not conducive to the overall performance of the hole seal; hole seal effective stiffness and frequency of penetration is not sensitive to changes in the hole depth, but the effective damping increases significantly with the decrease of the hole depth.The calculated results and experimental values Good fit.