Development and Implementation of a Technique for Fast Five-Hole Probe Measurements Downstream of a Linear Cascade
Development and Implementation of a Technique for Fast Five-Hole Probe Measurements Downstream of a Linear Cascade
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线性级联下游快速五孔探针测量技术的开发和实施
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
R. Niehuis
中科院分区：
文献类型：
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作者：
R. Gomes;J. Kurz;R. Niehuis
使用线性压气机或涡轮机叶栅的流量测量是一种成熟的技术，以一定程度的抽象来表征涡轮机中的流动。获得流动的一般特性的常用方法是用五孔探针测量叶栅下游的流动，例如，总压力损失和流动转向。气动五孔探头用于捕获稳定或时间平均流量，如果没有其他规定。根据探头几何形状、测量设置和流动特性，这种测量可能非常耗时。为了减少测量时间，在文献中提出了各种技术，但是对于某些应用，实现这种技术所需的努力可能超过增强的测量速度。在本文中，其他作者提出的方法相结合，并扩展到允许快速或瞬态五孔探针测量在强烈变化的流动条件。该方法的有效性的压气机叶栅下游的流动测量与附着和失速流（通过改变雷诺数），以及与稳定和周期性非定常来流。新方法可以将测量时间缩短90%，而不会影响测量精度。实际上，由于新方法具有较高的空间分辨率，因此可以更好地分辨叶栅下游的流动。
Flow measurement using a linear compressor or turbine cascade is a well-established technique to characterize the flow in turbomachines with a certain degree of abstraction. A common way to obtain a general characterization of the flow is to measure the flow downstream of the cascade with a five-hole probe, obtaining, e.g., total pressure losses and flow turning. Pneumatic five-hole probes are used to capture steady or time-averaged flow quantities, if not specified otherwise. In dependency of probe geometry, measurement set-up and flow properties, such measurements can be very time-consuming. Various techniques, in order to decrease the measurement time, are proposed in literature but for certain applications the efforts required to implement such techniques can outweigh the enhanced measurement speed. In this paper, methods proposed by other authors are combined and extended to allow for fast or transient five-hole probe measurements at strongly varying flow conditions. The effectiveness of this method is presented for flow measurements downstream of a compressor cascade with attached and stalled flow (by varying the Reynolds number) as well as with steady and periodically unsteady inflow. The new method allows to reduce the measurement time by up to 90 percent without compromising measurement accuracy. In fact, due to higher spatial resolution, the flow downstream of the cascade can be better resolved with the new method.