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THE FLOW FIELD AND MAIN GAS INGESTION IN A ROTOR-STATOR CAVITY

机译：转子定子腔中的流场和主要气体摄入

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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：将主流气体摄入涡轮转子 - 定子盘腔并同时摄取，腔气进入主要气体路径是主要的不稳定的三维流场的后果。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向涡轮机中的实验结合在具有计算流体动态（CFD）模拟中。涡轮台级具有叶片，叶片和轴向重叠的径向间隙边缘密封。在本文中，我们在由主空气流速，转子速度，转子速度和吹扫空气流速限定的四个实验条件下，通过粒子图像速度，通过粒子图像速度获得的时间分辨速度图。还呈现了时间平均但是局部局部测量主要空气摄取。在四个实验条件下发生的两个实验条件中的两个显着摄入是吹扫空气流速低的速度，发现高切线（漩涡）速度流体在腔的边缘区域中具有较低的切向速度流体。应说，高切向速度流体由摄入的主空气组成，而下切向速度流体是本土空气。这种解释是通过不稳定的三维CFD仿真的结果来证实的。当吹扫流速高时，没有预期不会发生摄取;而且，在腔流量中出现的大规模结构出现在导​​致大型速度波动中。对于在这种流动中从实验和计算获得时间解析的信息，因为即使叶片相对位置也匹配特定的实验，瞬时流场不一定保持不变。因此，如果询问时间尺度大，则一些流动模式将被涂抹。

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