考虑进口预旋的阶梯型迷宫密封转子动力特性

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考虑进口预旋的阶梯型迷宫密封转子动力特性

更新时间：2025-07-09

- 考虑进口预旋的阶梯型迷宫密封转子动力特性
- Issue 3, Pages: 117-123(2022)
- 作者机构：
  
  1. 西安交通大学机械结构强度与振动国家重点实验室
  2. 东方汽轮机有限公司产品研发中心
- 作者简介：
- 基金信息：
- DOI：
  CLC： TH136
- Published：2022
- 稿件说明：
移动端阅览
[J]. 2022, (3): 117-123.
DOI：

[J]. 2022, (3): 117-123. DOI：

摘要

针对阶梯型迷宫密封转子动力特性受进口预旋影响的问题，提出了考虑进口预旋的阶梯型迷宫密封动力特性计算方法。基于Murphy小位移涡动原理建立气流激振力-转子位移-转子速度的控制方程；采用计算流体力学(CFD)数值模拟方法对不同预旋比的全环密封流道进行计算，通过频域内求解控制方程得到了刚度和阻尼等动力特性参数，研究了不同预旋比的情况下阶梯型迷宫密封的动力特性；绘制了流道内的压力分布和流速矢量图，研究了阶梯型迷宫密封的流场特性。数值仿真结果表明：随着预旋比的增加，直接刚度在低频部分增大，在高频部分减小，交叉刚度几乎不变，交叉阻尼随预旋增加而减小；气流预旋明显降低了直接阻尼，相较于预旋比λ=0的情况，λ=0.255及λ=0.516的工况下直接阻尼的预估值平均减小了16.9%和21.4%;随着节流次数增加，气流经过密封齿的压降逐渐增加，分别为0.25、0.374和0.499 MPa

密封齿顶的流速也逐渐增加，分别为79.5、88.36和106.0 m/s;由于密封齿阶梯式的排列增加了主流道的复杂性，阶梯密封流道分为节流区、射流区和涡流区，涡流区2个转向相反的旋涡增加了流道内气流动能的耗散。

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