Effect of Ingress on Turbine Disks
Effect of Ingress on Turbine Disks
复制标题
入口对涡轮盘的影响
DOI：
10.1115/1.4031436
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Cho G
中科院分区：
文献类型：
--
作者：
Cho G
热气体通过燃气轮机轮缘密封的入口取决于涡轮环隙内主流气流与密封径向内侧轮隙主流气流之间的压差。本文描述了在密封流加压的轮空中，入口对定子和转子盘的影响的实验测量。红外(IR)传感器被开发和校准，以准确地测量旋转圆盘表面在瞬变实验期间的温度历史，从而导致绝热效果。根据绝热效率随密封流量的变化，评价了四种通用(虽然具有发动机代表性)单间隙和双间隙密封的性能。测量确定了所谓的热缓冲效应，即转子上的边界层保护磁盘免受进入的影响。结果表明，所有轮缘密封的转子效率显著高于定子的等效效率。尽管通过轮缘密封的入口是一个非定常的三维流场的结果，压力和密封效果之间的因果关系也很复杂，但时间平均的实验数据显示出了相对简单的半经验模型，这些模型在另一篇文章中描述。设计者特别感兴趣的是，重要的入口可以在转子感觉到它的影响之前进入车轮空间。
The ingress of hot gas through the rim seal of a gas turbine depends on the pressure difference between the mainstream flow in the turbine annulus and that in the wheel-space radially inward of the seal. This paper describes experimental measurements which quantify the effect of ingress on both the stator and rotor disks in a wheel-space pressurized by sealing flow. Infrared (IR) sensors were developed and calibrated to accurately measure the temperature history of the rotating disk surface during a transient experiment, leading to an adiabatic effectiveness. The performance of four generic (though engine-representative) single- and double-clearance seals was assessed in terms of the variation of adiabatic effectiveness with sealing flow rate. The measurements identify a so-called thermal buffering effect, where the boundary layer on the rotor protects the disk from the effects of ingress. It was shown that the effectiveness on the rotor was significantly higher than the equivalent stator effectiveness for all rim seals tested. Although the ingress through the rim seal is a consequence of an unsteady, three-dimensional flow field, and the cause–effect relationship between pressure and the sealing effectiveness is complex, the time-averaged experimental data are shown to be successfully predicted by relatively simple semi-empirical models, which are described in a separate paper. Of particular interest to the designer, significant ingress can enter the wheel-space before its effect is sensed by the rotor.
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影响因子：
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