Design and Performance Evaluation of an Open Loop Wind Tunnel at NIS

IF 1 4区工程技术 Q4 INSTRUMENTS & INSTRUMENTATION

MAPAN Pub Date : 2025-01-09 DOI:10.1007/s12647-024-00791-w

Fatma A-M. Kassem, Ahmed Farouk AbdelGawad, Mefreh M. Nassief, A. E. Abu El-Ezz, Mohamed Adel

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引用次数: 0

Abstract

This study presents the design and evaluation of wind tunnel performance at the National Institute of Standards in Egypt. Flow contraction in the convergent nozzle of a subsonic wind tunnel is one of the most effective means of reducing the level of turbulence intensity in the testing section. Accordingly, this study is based on designing a contraction ratio of 7, and comparing this ratio with previous studies in terms of turbulence intensity. The construction steps for the major components of the wind tunnel and calibration procedure are described. The calibration results show that the present wind tunnel provides a good repeatability of ± 0.003 m/s. In addition, reproducibility conditions provide a high confidence level in the results obtained from long-term investigations, with satisfactory performance. The results of the experimental study on the influence of flow contraction on the mean turbulence intensity in the convergence nozzle of an open-loop subsonic wind tunnel were less than 0.5%. In addition, the accuracy and stability of the wind tunnel design were verified using statistical evaluation of the normalized error value (En-value). The results indicate that the maximum normalized error of the measurement at the end of the test section was 0.8.

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NIS开环风洞设计与性能评价

本研究介绍了埃及国家标准研究所风洞性能的设计和评估。亚音速风洞收敛喷口内的流动收缩是降低试验段湍流强度的最有效手段之一。因此，本研究的基础是设计一个7的收缩比，并将该收缩比与以往研究的湍流强度进行比较。介绍了风洞主要部件的施工步骤和标定过程。标定结果表明，该风洞具有良好的重复性，可达±0.003 m/s。此外，再现性条件为长期调查所得结果提供了高可信度，并具有令人满意的性能。流动收缩对开环亚音速风洞收敛喷口平均湍流强度影响的实验研究结果小于0.5%。此外，利用归一化误差值（En-value）的统计评价，验证了风洞设计的准确性和稳定性。结果表明，试验段末端测量的最大归一化误差为0.8。

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来源期刊

MAPAN 工程技术-物理：应用

CiteScore

2.30

自引率

20.00%

发文量

审稿时长

3 months

期刊介绍： MAPAN-Journal Metrology Society of India is a quarterly publication. It is exclusively devoted to Metrology (Scientific, Industrial or Legal). It has been fulfilling an important need of Metrologists and particularly of quality practitioners by publishing exclusive articles on scientific, industrial and legal metrology. The journal publishes research communication or technical articles of current interest in measurement science; original work, tutorial or survey papers in any metrology related area; reviews and analytical studies in metrology; case studies on reliability, uncertainty in measurements; and reports and results of intercomparison and proficiency testing.