Effect of Ingestion on Temperature of Turbine Disks
Effect of Ingestion on Temperature of Turbine Disks
复制标题
吸入对涡轮盘温度的影响
DOI：
10.1115/1.4007503
复制
发表时间：
2013
影响因子：
1.7
通讯作者：
J. Owen
中科院分区：
文献类型：
--
作者：
Oliver J Pountney;C. Sangan;G. Lock;J. Owen
本文描述了一个研究装置的实验结果，该装置对热气进入带有轴向间隙边缘密封的轴向涡轮机级的叶轮空间进行了实验建模。热致变色液晶（TLC）用于确定摄入对旋转盘传热的影响;据作者所知，这是第一次公布摄入对绝热温度的测量影响。定义了转子的绝热有效性，该定义用于确定转子何时首次经历进入效应。定子上的浓度测量用于确定边缘密封的密封有效性，加热密封空气的瞬态传热试验用于确定转子的绝热有效性。热缓冲比，这是定义为密封流量的比率时，第一次发生的入口，当它是第一次经历的转子，被证明取决于湍流参数。在转子上测得的局部努塞尔数Nu明显小于自由盘的努塞尔数;随着密封流速的降低和入口的相应增加，局部努塞尔数Nu也随之降低。在这些实验中获得的Nu值和绝热效率为计算流体动力学代码的验证提供了数据，但如果将它们（特别是Nu值）外推到发动机工况，则需要谨慎。
This paper describes experimental results from a research facility which experimentally models hot-gas ingress into the wheel-space of an axial turbine stage with an axial-clearance rim seal. Thermochromic liquid crystal (TLC) was used to determine the effect of ingestion on heat transfer to the rotating disk; as far as the authors are aware, this is the first time that the measured effects of ingestion on adiabatic temperature have been published. An adiabatic effectiveness for the rotor was defined, and this definition was used to determine when the effect of ingress was first experienced by the rotor. Concentration measurements on the stator were used to determine the sealing effectiveness of the rim seal, and transient heat transfer tests with heated sealing air were used to determine the adiabatic effectiveness of the rotor. The thermal buffer ratio, which is defined as the ratio of the sealing flow rate when ingress first occurs to that when it is first experienced by the rotor, was shown to depend on the turbulent flow parameter. The local Nusselt numbers, Nu, which were measured on the rotor, were significantly smaller than those for a free disk; they decreased as the sealing flow rate decreased and as the ingress correspondingly increased. The values of Nu and adiabatic effectiveness obtained in these experiments provide data for the validation of CFD codes but caution is needed if they (particularly the values of Nu) are to be extrapolated to engine conditions.