Characteristics of Nonequilibrium Radiation behind Strong Shock Waves in Low-Density Air

低密度空气中强冲击波背后的非平衡辐射特征

• 批准号: 09305064
• 负责人: MAENO Kazuo
• 金额: $ 22.34万
• 依托单位: Chiba University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A).
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09305064/
• 关键词: strong shock waves; free piston shock tube; radiation; high-speed photography; plasma spectroscopy; hyper velocity; imaging spectrograph; ultraviolet spectroscopy; 大気圏再突入; サンプル・リターン

Nonequilibrium radiation characteristics behind strong shock waves in low-density air is experimentally investigated by the ultraviolet diagnostic system for simultaneous observation of the total radiation and its spectral radiation of the air behind the hypervelocity shock wave of up to 12km/s by using the free-piston, double-diaphragm shock tube.1. The characteristics of the free-piston, double-diaphragm shock tube flows and tube operation is investigated numerically and experimentally. From the results obtained it is elucidated that there exist the effects of compression process and diaphragm rapture duration on the total tube characteristics. Total reproducibility of the tube data has been increased by these results.2. Simultaneous measurements of total radiation and the spectral radiation in the nonequilibrium, chemically reacting air behind the strong shock waves in low-density air are performed. Among the results the total radiation profiles of one-peak to two-peaks in strength are elucidated to reflect the possibility of radiation from the chemical reactions by contaminants in test gas.3. Doing the improved experiments by purified conditions of the test section and the test gas by new instruments of shock tube and gas monitoring system, the more precise data of ultraviolet spectral and total radiation are obtained. The obtained radiation profiles are discussed in view of test gas composition effects.4. Numerical analysis for radiation phenomena in the strong shock induced flow along a flat plate is investigated by Navier-Stokes equation coupled with thermochemical nonequilibrium. The results indicates the existence of intense nonequilibrium radiation in shock induced boundary layer.

紫外线诊断系统在实验中研究了强密度空气中强冲击波背后的非平衡辐射特征，以同时观察总辐射及其在高速度冲击波后面的空气光谱高达12公里/s后面的空气辐射。活塞，双峰式冲击管1。在数值和实验中研究了自由活塞，双轴线冲击管的特征和管操作的特征。从获得的结果可以阐明，有压缩过程和diaphragm apruture持续时间对总管特征的影响。通过这些结果增加了管数据的总可重复性。2。在低密度空气中，同时测量了非平衡的总辐射和光谱辐射，化学反应空气。在结果中，阐明了一峰至两峰强度的总辐射谱，以反映测试气体中污染物从化学反应中辐射的可能性。3。通过测试部分的纯化条件以及通过冲击管和气体监测系统的新仪器进行测试气体进行改进的实验，获得了紫外光谱和总辐射的更精确的数据。根据测试气体组成效应，讨论了获得的辐射谱。4。 Navier-Stokes方程与热化学非平衡相结合，研究了沿平板的强休克感引起的沿平板的辐射现象的数值分析。结果表明在冲击感应边界层中存在强烈的非平衡辐射。

项目成果

Morioka,T.,Sakurai,N.,Maeno,K.,and Honma,H.: "Imaging spectroscopy of radiation behind strong shock waves in air"Theoretical and Applied Mechanics (Eds.) Yagawa,G.and Miki,C.. Vol.46. 307-315 (1997)

Morioka,T.、Sakurai,N.、Maeno,K. 和 Honma,H.：“空气中强冲击波背后的辐射成像光谱”理论与应用力学（编辑）Yakawa,G. 和 Miki,C.

Watanabe N., Maeno K., Honma H.: "A Numerical Analysis for Nonequilibrium, Viscous Flow in A Shock Tube Problem"CD-ROM Proceedings of the 22nd International Symposium on Shock Waves. Paper No.1453. (1999)

Watanabe N.、Maeno K.、Honma H.：“激波管问题中非平衡粘性流的数值分析”第 22 届国际激波研讨会论文集 CD-ROM。

Hiroki Honma他4名: "A Shock Tube Study on Nonequilibrium Radiation of Strong Shock Waves in Low-Density Air" Proc.International Conference on Fluid Engineering. Vol.1. 379-384 (1997)

Hiroki Honma 和其他 4 人：“低密度空气中强冲击波非平衡辐射的激波管研究”Proc.国际流体工程会议第 379-384 卷（1997 年）。

S.A.Bystrov 他7名: "Density reconstruction from laser schlieren signal in shock tube experiments" Shock Waves(International J.of Shock Waves). Vol.8. 183-189 (1998)

S.A.Bystrov 和其他 7 人：“激波管实验中激光纹影信号的密度重建”《冲击波》（International J.of Shock Waves）第 8 卷（1998 年）。

森岡敏博他6名: "空気中の強い衝撃波背後の発光特性-第1報-全放射発光観測" 日本航空宇宙学会誌. 45巻・523号. 453-457 (1997)

Toshihiro Morioka 等 6 人：“空气中强冲击波背后的光发射特性 - 第 1 部分 - 总辐射发射观测”日本航空航天学会杂志，第 45 卷，第 523 期。453-457（1997 年）。