Using the zonal calibration algorithm with adaptive inner boundary to improve the measurement accuracy of five-hole probe

IF 2.3 3区工程技术 Q2 ENGINEERING, MECHANICAL

Experiments in Fluids Pub Date : 2024-09-26 DOI:10.1007/s00348-024-03883-0

Haideng Zhang, Tangyi Zhang, Yun Wu

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Abstract

Zonal calibration algorithm is the most widely used method to extend the measurement range of five-hole probes. However, large measurement error will be aroused near the boundary between two neighboring zones and this is acknowledged as the inner boundary measurement problem of zonal calibration algorithm. To tackle this problem, a two-dimensional uniform flow model is developed in this paper to describe the relationship between pressure from holes and flow angles. Based on this model, a method to adjust the boundary between two neighboring zones automatically with respect to inlet flow conditions is developed. With this novel method, the data extrapolation of zonal calibration algorithm at measurement stations near the boundary between two neighboring zones is avoided, and the corresponding large measurement error is eliminated. According to the experimental data, maximum measurement error of total pressure and flow angle can reach 7.5% and 3.2°, and will be reduced to 0.89% and 0.12° by the novel method. Resultantly, the inner boundary measurement problem of zonal calibration algorithm is solved. Influences of several key parameters on the measurement accuracy of the novel method are investigated too, and criteria to adjust the boundary between two neighboring zones are given. Conclusions of this paper can be used to further improve the accuracy of five-hole probes in measuring large angle flows.

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使用带自适应内边界的分区校准算法提高五孔探头的测量精度

分区校准算法是扩大五孔探头测量范围最广泛使用的方法。然而，在两个相邻区域的边界附近会产生较大的测量误差，这被认为是分区校准算法的内边界测量问题。为解决这一问题，本文建立了一个二维均匀流模型来描述孔压力与流角之间的关系。基于该模型，本文提出了一种根据入口流动条件自动调整两个相邻分区之间边界的方法。有了这种新方法，就避免了在两个相邻区域边界附近的测站采用分区校准算法进行数据外推，并消除了相应的较大测量误差。根据实验数据，总压和流角的最大测量误差可达 7.5%和 3.2°，而采用新方法后将分别减小到 0.89%和 0.12°。从而解决了分区校准算法的内边界测量问题。本文还研究了几个关键参数对新方法测量精度的影响，并给出了调整两个相邻分区之间边界的标准。本文的结论可用于进一步提高五孔探头测量大角度流动的精度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experiments in Fluids 工程技术-工程：机械

CiteScore

5.10

自引率

12.50%

发文量

157

审稿时长

3.8 months

期刊介绍： Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.