Radiation investigation behind 4.7 km/s shock waves with nitrogen using a square section shock tube

IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Acta Mechanica Sinica Pub Date : 2024-09-23 DOI:10.1007/s10409-024-24258-x
Senhao Zhang  (, ), Yuzhe Zhang  (, ), Yixin Xu  (, ), Tianrui Bai  (, ), Kai Luo  (, ), Renjie Li  (, ), Qiu Wang  (, ), Xin Lin  (, ), Fei Li  (, )
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Abstract

The thermochemical non-equilibrium phenomena encountered by hypersonic vehicles present significant challenges in their design. To investigate the thermochemical reaction flow behind shock waves, the non-equilibrium radiation in the visible range using a shock tube was studied. Experiments were conducted with a shock velocity of 4.7 km/s, using nitrogen at a pressure of 20 Pa. To address measurement difficulties associated with weak radiation, a special square section shock tube with a side length of 380 mm was utilized. A high-speed camera characterized the shock wave’s morphology, and a spectrograph and a monochromator captured the radiation. The spectra were analyzed, and the numerical spectra were compared with experimental results, showing a close match. Temperature changes behind the shock wave were obtained and compared with numerical predictions. The findings indicate that the vibrational temperatures are overestimated, while the vibrational relaxation time is likely underestimated, due to the oversimplified portrayals of the non-equilibrium relaxation process in the models. Additionally, both experimental and simulated time-resolved profiles of radiation intensity at specific wavelengths were analyzed. The gathered data aims to enhance computational fluid dynamics codes and radiation models, improving their predictive accuracy.

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使用方形截面冲击管对 4.7 km/s 冲击波背后的氮辐射进行研究
高超音速飞行器遇到的热化学非平衡现象给其设计带来了巨大挑战。为了研究冲击波背后的热化学反应流,我们利用冲击管研究了可见光范围内的非平衡辐射。实验使用压力为 20 Pa 的氮气,冲击速度为 4.7 km/s。为了解决与弱辐射有关的测量困难,使用了边长为 380 毫米的特殊方形截面冲击管。高速照相机记录冲击波的形态,摄谱仪和单色仪捕捉辐射。对光谱进行了分析,并将数值光谱与实验结果进行了比较,结果显示两者非常接近。获得了冲击波后的温度变化,并与数值预测进行了比较。研究结果表明,由于模型对非平衡弛豫过程的描述过于简化,振动温度被高估,而振动弛豫时间可能被低估。此外,还分析了特定波长辐射强度的实验和模拟时间分辨曲线。所收集的数据旨在增强计算流体动力学代码和辐射模型,提高其预测准确性。
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来源期刊
Acta Mechanica Sinica
Acta Mechanica Sinica 物理-工程:机械
CiteScore
5.60
自引率
20.00%
发文量
1807
审稿时长
4 months
期刊介绍: Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics
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