Spiral-grooved gas face seal for steam turbine shroud tip leakage reduction: Performance and feasibility analysis

Spiral-grooved gas face seal for steam turbine shroud tip leakage reduction: Performance and feasibility analysis
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用于减少汽轮机护罩尖端泄漏的螺旋槽气体面密封:性能和可行性分析

DOI:
10.1016/j.triboint.2016.02.035
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发表时间:
2016-06
影响因子:
6.2
通讯作者:
Yang Jiangang
Yang Jiangang
中科院分区:
工程技术1区
文献类型:
--
作者:
Xu Wanjun;Yang Jiangang

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为了最大限度地减少汽轮机叶冠泄漏及其对气动损失的影响,利用螺旋槽气面密封理论,提出了一种新的叶冠密封设计方法。为了验证该方法的有效性,通过流动数值模拟研究了新型叶冠密封对汽轮机转子排气动损失的影响。结果表明,与传统的双齿迷宫密封相比,新型叶冠密封的泄漏量减少了99.3%,转子排效率提高了1.9%。在此基础上,对气膜的升力、刚度、主环的跟踪响应和配合环的变形进行了可行性分析。目前的设计是进一步提高涡轮级性能的潜在途径。
In order to minimize shroud leakage and its effect on aerodynamic loss of steam turbines, a new shroud seal design by employing spiral-grooved gas face seal theory is presented. To verify the method, a flow numerical simulation was conducted to investigate the effect of the new shroud seal on aerodynamic loss in steam turbine rotor row. The results show, compared with a traditional two-tooth labyrinth seal, the new shroud seal leakage is reduced by 99.3%, and the rotor row efficiency is improved by 1.9%. Furthermore, a feasibility analysis including lift and stiffness of gas film, tracking response of primary ring and deformation of mating ring was presented. The present design is a potential approach to further improve turbine stage performance.
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