浮环密封结构弹性对间隙泄漏量和动力学系数的影响

Effects of Structure Elasticity on Leakage and Rotordynamic Coefficients of Floating Ring Seals

关键词:  浮环密封  结构弹性  Bulk flow  泄漏量  动力学系数

Key words:  Floating ring seal  Structural elasticity  Bulk flow  Leakage  Rotordynamic coefficients

摘要:

为了研究高压条件下浮环密封结构弹性变形对间隙流体激励产生的影响，基于bulk flow模型、有限单元法和位移-位移耦合模式，建立密封间隙流体激励和浮环结构耦合模型。通过与文献和商业软件对比，验证耦合模型的正确性和计算方法的准确性。研究结果表明高压条件下浮环结构弹性导致密封间隙明显缩小，对心条件下，入口处弹性变形达到21.43%，泄漏量减小19.2%。同时，主刚度降低，交叉刚度相对增加，锁死偏心率越大，结构弹性的影响越明显，导致转子临界转速降低和振动响应增大。

Abstract:

To study the effects of elastic deformation of floating ring seals on hydrodynamic forces under high pressure，a coupled model of flow field in the seal clearance and elastic structure of the floating ring is established，by making use of bulk flow model，finite element method and displacement-displacement coupled method. By comparison with reference and commercial software result，the coupled model and calculation procedure are proved to be accurate. The results show that structural elasticity of floating ring seals results in narrowing clearance height with 21.43% deformation at the seal entrance and leakage reducing 19.2%. Direct stiffness decreases and coupled stiffness increases relatively when structural elasticity is taken into consideration. With eccentricity ratio increasing，the effect of structural elasticity becomes much evident. Elastic deformation of floating ring seals results in the decrease of the critical speed of rotor decreases and the increase of vibration amplitude.