Numerical Investigations on Unsteady Mainstream Ingestion Characteristics of Turbine Rim Seals

doi:10.7652/xjtuxb201401010

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Numerical Investigations on Unsteady Mainstream Ingestion Characteristics of Turbine Rim Seals

更新时间：2025-07-09

- Numerical Investigations on Unsteady Mainstream Ingestion Characteristics of Turbine Rim Seals
- Vol. 48, Issue 1, Pages: 53-59(2014)
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201401010
  CLC： TK474.7
- Online First：10 January 2014，
  
  Published：2014
- 稿件说明：
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Numerical Investigations on Unsteady Mainstream Ingestion Characteristics of Turbine Rim Seals[J]. 2014, 48(1): 53-59.
DOI：

Numerical Investigations on Unsteady Mainstream Ingestion Characteristics of Turbine Rim Seals[J]. 2014, 48(1): 53-59. DOI： 10.7652/xjtuxb201401010.

摘要

采用附加示踪变量的方法

通过数值求解URANS和SST紊流模型的方法研究了轮缘密封非定常燃气入侵特性和封严效率

计算了不同冷气量下定常和非定常时均径向轮缘密封的封严效率

并与实验值进行了比较

验证了非定常数值方法研究轮缘密封燃气入侵特性的有效性

对比分析了径向和径向-轴向轮缘密封中等冷气量下定常和非定常的燃气入侵特性。结果表明:静叶尾迹和动叶前缘附近的压力势场的非定常干涉效应及盘腔中非定常的压力分布会强化主流燃气入侵; 相比非定常计算

定常分析会低估轮缘密封的燃气入侵量及燃气入侵对盘腔流场的影响; 相比径向轮缘密封

径向-轴向轮缘密封可以显著提高涡轮盘腔的封严效率。

Abstract

The mainstream ingestion characteristics of turbine radial and radial-axial rim seals in an experimental model turbine stage were numerically investigated by solving the unsteady Reynolds-averaged Navier-Stokes(URANS)equations and the SST turbulence model. The additional passive tracer was used to simulate the distribution of mainstream ingestion and its mixing with the sealing flow. The averaged unsteady sealing efficiency of the radial rim seal agrees well with the experimental data. The effectiveness of the utilized URANS approach to investigate the mainstream ingestion characteristics of the turbine rim seal was verified. The steady and unsteady mainstream ingestion characteristics were compared and analyzed at moderate cooling flow. The numerical results show that the unsteady interaction between the vane trailing wake and the blade bow wave will strengthen the mainstream ingestion of rim seals. Unlike the unsteady simulations

the steady simulations will underestimate the mainstream ingestion and its influence on the wheel cavity flow field for two rim seals. The sealing efficiency of the inner cavity will be significantly improved by applying the radial-axial rim seal.

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references

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SUN Jining, LUO Xiang, LIU Jinnan, et al. Volume fraction technique for measuring the minimum value of mass flow in turbine rotor-stator disk cavities[J]. Journal of Aerospace Power, 2012, 27(5): 981-985.

高庆, 陶加银, 宋立明, 等. 涡轮轮缘密封封严效率的数值研究[J]. 西安交通大学学报, 2013, 47(5): 12-17.

GAO Qing, TAO Jiayin, SONG Liming, et al. Numerical investigation on the sealing efficiency of the turbine rim seal[J]. Journal of Xi'an Jiaotong University, 2013, 47(5): 12-17.

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