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.

利用紫外诊断系统，利用自由活塞双隔膜激波管同时观测高达12km/s的超高速激波后空气的总辐射及其光谱辐射，对低密度空气中强激波后的非平衡辐射特性进行了实验研究。对自由活塞、双隔膜激波管的流动和运行特性进行了数值和实验研究。结果表明，压缩过程和膜片断裂时间对总管特性存在影响。这些结果提高了试管数据的总再现性。同时测量了低密度空气中强激波背后的非平衡、化学反应空气中的总辐射和光谱辐射。其中，阐明了单峰至双峰强度的总辐射分布图，反映了测试气体中污染物化学反应产生辐射的可能性。利用新的激波管仪器和气体监测系统对试验段的净化条件和试验气体进行改进实验，获得了更精确的紫外光谱和总辐射数据。从试验气体组成效应的角度讨论了所得的辐射剖面。利用Navier-Stokes方程结合热化学不平衡对平板强激波诱导流动中的辐射现象进行了数值分析。结果表明，激波边界层存在强烈的非平衡辐射。

项目成果

森岡敏博,他2名: "CCDカメラシステムによる衝撃波発光の可視化"可視化情報学会誌(特集記事). 第19巻 第75号. 17-22 (1999)

Toshihiro Morioka 等 2 人：“使用 CCD 相机系统实现冲击波发射的可视化”《可视化信息学会杂志》（特刊）第 19 卷第 75 期。17-22（1999 年）。

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。

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.

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）。