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首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.4 pt.B; 20070514-17; Montreal(CA) >THE FLOW FIELD AND MAIN GAS INGESTION IN A ROTOR-STATOR CAVITY
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THE FLOW FIELD AND MAIN GAS INGESTION IN A ROTOR-STATOR CAVITY

机译：定子静腔中的流场和主要气体吸收

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摘要

The ingestion of mainstream gas into turbine rotor-stator disk cavities and simultaneously, the egress of cavity gas into the main gas path are consequences of the prevailing unsteady, three-dimensional flow field. To understand these processes, we are carrying out a study that combines experiments in a model single-stage axial turbine with computational fluid dynamic (CFD) simulations. The turbine stage features vanes, blades, and axially overlapping radial clearance rim seal. In this paper, we present time-resolved velocity maps, obtained by particle image velocimetry, of the flow in the disk cavity at four experimental conditions as defined by the main air flow rate, rotor speed, and purge air flow rate. Time-averaged but spatially local measurement of main air ingestion is also presented. Significant ingestion occurred at two of the four experimental conditions where the purge air flow rate was low -it is found that high tangential (swirl) velocity fluid intersperses with lower tangential velocity fluid in the rim region of the cavity. It is argued that the high tangential velocity fluid is comprised of the ingested main air, while the lower tangential velocity fluid is the indigenous cavity air. This interpretation is corroborated by the results of the unsteady, three-dimensional CFD simulation. When the purge flow rate was high, no ingestion occurred as expected; also, large-scale structures that were unsteady appeared in the cavity flow giving rise to large velocity fluctuations.It is necessary to obtain time-resolved information from experiments and computation in such a flow because even when the vane-blade relative position is matched during a particular experiment, the instantaneous flow field does not necessarily remain the same. As such, some of the flow patterns will be smeared out if the interrogation time scale is large.
机译：主流气体被吸入涡轮转子-定子盘腔中，同时腔体气体进入主气体路径是普遍存在的不稳定三维流场的结果。为了理解这些过程，我们正在进行一项研究，该研究将模型单级轴流式涡轮机中的实验与计算流体动力学（CFD）仿真相结合。涡轮级具有叶片，叶片和轴向重叠的径向间隙边缘密封。在本文中，我们展示了通过颗粒图像测速技术获得的时间分辨速度图，该图是在四个实验条件下（主要空气流量，转子速度和吹扫空气流量）定义的，磁盘腔中的流动。还介绍了主要空气摄入的时间平均但空间局部测量。在吹扫空气流速较低的四个实验条件中的两个条件下，发生了明显的吸入-发现在腔体的边缘区域中，高切向（旋流）速度的流体散布着较低切向速度的流体。有人认为，切线速度高的流体是由摄入的主空气组成，而切线速度低的流体是本征腔空气。不稳定的三维CFD模拟结果证实了这种解释。当吹扫流速高时，没有发生如预期的摄入。同样，在空腔流中会出现不稳定的大型结构，从而引起较大的速度波动。在这种流中，即使从叶片和叶片的相对位置匹配，也有必要从实验和计算中获得时间分辨信息。在特定的实验中，瞬时流场不一定保持不变。这样，如果询问时间尺度很大，某些流型将被抹去。

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