指尖封严的转子轴心轨迹与泄漏特性的试验

Experiment on axis locus of rotor and leakage characteristics of finger seal

对间隙、过渡、过盈3种配合状态的指尖封严组件的转子轴心轨迹和泄漏特性进行了试验.转子的轴心轨迹采用电涡流传感器进行测量,其测量结果表明:转速越大,转子轴心的偏移越小;在不考虑磨损的情况下轴心偏移对配合状态基本没有影响.由此确保了封严试验台的安全性和有效性.在此基础上,试验研究了转子转速、上下游压差以及封严间隙对泄漏特性的影响.结果表明:泄漏系数随转速增加略有减小;过渡和间隙配合时,在压差小于0.3MPa时泄漏系数随压差增加而增大,压差达到0.3MPa后,泄漏系数趋于平缓;过盈配合时压差对泄漏系数没有明显的影响;泄漏系数随封严间隙的减小而减小,随过盈量的增大而减小.

Experimental research on the axis locus of rotor and leakage characteristics of finger seal tests of clearance,transition and interference fit was conducted.The axis locus of rotor was measured by eddy current sensors.The results show that the higher the rotor rotation speed,the smaller the offset of the axis.And the offset does not affect the fit state if the wear is not considered,which assured the reliability of the test rig.And then the influences of factors such as the rotation speed,the pressure drop and the sealing clearance on the leakage characteristics was studied.The results show that the leakage coefficient slightly decreases with the increase of the rotation speed.For the case of clearance and transition fit,the leakage coefficient increases with the increase of the pressure drop which is below than 0.3MPa and then almost keeps constant while the pressure drop exceeds 0.3MPa.For the case of interference fit the pressure drop almost has no influence on leakage coefficient.The leakage coefficient reduces with the decrease of the sealing clearance and with the increase of interference.