高速齿轮箱迷宫密封泄漏量正交仿真试验优化

Orthogonal Simulation Test and Optimization for Leakage of Labyrinth Seal in High Speed Gear Box

以某型号高速动车组传动齿轮箱大齿轮电机端的迷宫密封结构为研究对象,运用Fluent建立带有扩散空腔的迷宫密封二维轴对称有旋流动模型,对迷宫密封泄漏量进行模拟仿真,指出现有结构存在密封间隙略大、齿顶角度较大、空腔深度较浅的不足。采用Design-expert 8.0软件设计仿真方案,通过分析密封间隙、齿形角度、密封齿数、密封空腔深度及传动轴转速对迷宫密封泄漏量的影响,得到一组使泄漏量最低的最优参数。结果表明:单因素对迷宫密封泄漏量影响的强弱顺序依次为密封间隙、空腔深度、齿数、角度,转速对泄漏量几乎没有影响;交互作用影响因素中,密封间隙和空腔深度对泄漏量影响大于密封间隙和齿数。通过重新建模仿真验证了利用Design-Expert 8.0软件设计迷宫密封泄漏量仿真试验方案和进行迷宫密封参数优化是可行的。

Taking the labyrinth seal structure of the gear motor end of a high-speed EMU gearbox as the research object,the two-dimensional axisymmetric rotational flow model of the labyrinth seal with a diffusion cavity was established by using Fluent to simulate the leakage of labyrinth seals.The structural deficiencies of this labyrinth seal,such as a slightly larger seal gap,a larger tip angle,and a shallower cavity depth,were pointed out. A simulation program was designed by using Design-expert 8. 0 software to analyze the effects of seal gap,tooth angle,number of seal teeth,depth of sealed cavity,and rotation speed of the drive shaft on the leakage of labyrinth seal,and a set of optimal parameters were obtained to minimize leakage.The results show that the order of the influence of single factor on the leakage of labyrinth seal is seal gap,depth of cavity,number of teeth,and angle. Rotational speed has almost no effect on leakage. Among the influencing factors of interaction,the influence of seal clearance and cavity depth on leakage is greater than that of seal clearance and tooth number.Through remodelling and simulation,it is verified that it is feasible to use Design-Expert 8. 0 software to design the simulation test scheme of labyrinth seal leakage and optimize the parameters of labyrinth seal.