Design and flow characterization of the Mach 5 shock tunnel at New Mexico State University

IF 1.8 4区工程技术 Q3 MECHANICS

Shock Waves Pub Date : 2025-05-06 DOI:10.1007/s00193-025-01226-4

L. Saenz, J. Frankel, A. Gross, F. Shu

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Abstract

This paper provides a comprehensive discussion on the flow characterization and design of the Mach 5 shock tunnel facility at the Hypersonic Research Center of New Mexico State University (NMSU). It reviews the operational principles of low-enthalpy shock tunnels as well as the measurement techniques employed for the facility characterization. The material and thickness of the secondary diaphragm are shown to significantly affect the stability of stagnation properties. Stagnation conditions are determined through an analysis of pressure–time history data measured in the driven tube. Schlieren flow visualizations over a 10\(^\circ \) half-angle straight cone and a sphere are used to estimate the freestream Mach number. Additionally, femtosecond laser electronic excitation tagging (FLEET) velocimetry is conducted to measure instantaneous velocities in the freestream and turbulent boundary layer flows within the test section. The shock tunnel has a total temperature ranging between 610 and 630 K, with a freestream Mach number of 5.1. The steady test time, as indicated by pitot pressure measurements, ranges from 2 to 2.5 ms, while velocimetry and wall-static pressure data suggest that driver gas arrival in the test section occurs approximately 30 ms after flow stabilization. The facility was made available for use in undergraduate courses in Fall 2022.

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新墨西哥州立大学5马赫激波隧道的设计与流动特性

本文对新墨西哥州立大学高超声速研究中心5马赫激波隧道装置的流动特性和设计进行了全面的讨论。它回顾了低焓激波隧道的工作原理以及用于设施表征的测量技术。二级隔膜的材料和厚度对滞止性能的稳定性有显著影响。通过分析在驱动管内测量的压力-时间历史数据，确定了滞止条件。采用10 \(^\circ \)半角直锥和球面上的纹影流可视化来估计自由流马赫数。此外，采用飞秒激光电子激励标记测速（FLEET）技术测量试验段内自由流和湍流边界层流动中的瞬时速度。激波通道的总温度在610 ～ 630 K之间，自由流马赫数为5.1。根据皮托管压力测量，稳定测试时间范围为2至2.5 ms，而测速和壁面静压数据表明，在流动稳定后约30 ms，驱动气体到达测试段。该设施于2022年秋季开始用于本科课程。

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来源期刊

Shock Waves 物理-力学

CiteScore

4.10

自引率

9.10%

发文量

审稿时长

17.4 months

期刊介绍： Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.