Measurement of Vibrational/Rotational Temperatures of Nitrogen in the Flow behind Strong Shock Wave by Time-resolving CARS Method

时间分辨CARS法测量强冲击波后流动中氮气的振动/旋转温度

• 批准号: 13305064
• 负责人: MAENO Kazuo
• 金额: $ 35.11万
• 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: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13305064/
• 关键词: strong shock waves; plasma spectroscopy; radiation nonequilibrium; CARS; hypervelocity flow; pulse laser; vibrational & rotational temperatures; spectral matching; レーザー; 自由ピストン2段膜衝撃波管; 時間分解分光; 高温空気

The novel application by CARS(Coherent Anti-Stokes Raman Spectroscopy) method has been performed to the measurement of vibrational and rotational temperatures in high temperature, hypervelocity, and radiative non-equilibrium flow behind strong shock waves in low density air over the shock velocity range of 5km/sec. The system consists of YAG laser(pumping beam), dye laser(Stokes beam), optical arrangement, and II-CCD spectroscopy instrument for ultraviolet range. The CARS signal can be obtained successively both from the steady low density air and hypervelocity flow behind the strong shock wave.1.After the preliminary experiment for the steady and low density air, the spot CARS signal could be obtained from hypervelocity air behind strong shock wave of the velocity over 10km/s by using a narrow band Stokes beam of dye laser. The signal was obtained from the newly contrived trigger system and optics. Then by the broadband Stokes beam of dye laser the CARS signal that is wide enough for … More measuring the spectroscopic information of vibrational and rotational temperature has been obtained.2.Then a spectroscopic matching method is applied to the measured CARS signal with considering the parameters of optical and spectroscopic system. In the matching process the least square method is adopted in parametric shooting of vibrational and rotational temperatures. In particular non-resonant term of third-order nonlinear susceptibility is taken into account for the spectral estimation.3.From the contrived and advanced technique for the CARS measurement to our hypervelocity and radiative non-equilibrium flow, we have succeed to obtain the CARS signal data, which have enough strength and width in frequency range for the temperature decision. The vibrational and rotational temperatures have been obtained precisely by the spectroscopic matching method of measured CARS data and theoretically estimated spectroscopy for the shock velocity range over 5km/s, which is corresponding to Mach number range over 15. The precise spatial distributions of vibrational and rotational temperatures in the radiating hypervelocity flow behind the strong shock wave front have been obtained.The results have been reported in both domestic and international symposium, where strong interest and discussion have been concentrated to our novel research results. Less

利用相干反斯托克斯拉曼光谱（汽车）技术测量了低密度空气中5 km/s范围内的高温、超高速、强激波后辐射非平衡流的振动和转动温度。该系统由YAG激光器（泵浦光）、染料激光器（斯托克斯光）、光学装置和II-CCD紫外光谱仪组成。通过对稳定低密度空气的初步实验，利用窄带Stokes染料激光束，可以在速度大于10 km/s的强激波后的超高速空气中获得点汽车信号。信号是从新设计的触发系统和光学系统中获得的。然后利用染料激光器的宽带Stokes光束， ...更多信息 2.在考虑光学系统参数和光谱系统参数的基础上，对CARS信号进行光谱匹配，得到了CARS信号的振动和转动温度的光谱信息。在匹配过程中，采用最小二乘法进行振转温度的参数拟合。特别是在谱估计中考虑了三阶非线性极化率的非共振项。3.利用先进的汽车测量技术，对超高速非平衡辐射流场进行了测量，获得了具有足够强度和频率宽度的汽车信号数据。在激波速度大于5 km/s的范围内（对应马赫数大于15的范围），用汽车数据和理论估算光谱的光谱匹配方法精确地获得了振动和转动温度。得到了强激波阵面后辐射超高速流中振动温度和转动温度的精确空间分布，并在国内外学术会议上发表，引起了人们的广泛关注和讨论。少

项目成果

Preliminary test of coherent Anti-Stokes Raman spectroscopy for strong shock waves

强冲击波相干反斯托克斯拉曼光谱初步测试

• 发表时间: 2005
• 期刊: AIAA Aerospace Meeting, Reno AIAA-Reno
• 作者: Kazuhiro Toyoda;Hisao Sato;Hiroyuki Ando;Katsumi Miyazaki;Kazunori Takada;Kazuo Maeno
• 通讯作者: Kazuo Maeno

Moment solution of comprehensive kinetic model for plane shock wave problem

平面激波问题综合动力学模型的矩解

• 发表时间: 2004
• 期刊: "Shock Waves", Proceedings of 24th International Symposium on Shock Waves(Beijing), Springer PaperNo.2121(CD ROM)
• 作者: Ryoichi Nagai;Kazuo Maeno;Hiroki Honma;Akira Sakurai
• 通讯作者: Akira Sakurai

Trajectory angles for Mach reflection of strong shock waves in air

空气中强冲击波马赫反射的轨迹角

• 发表时间: 2002
• 期刊: Proceedings of 23^<rd> International Symposium on Shock Waves, Fort Worth, USA (CD-ROM) Proc.
• 作者: Toshihiro Morioka;Kazuo Maeno;Hiroki Honma
• 通讯作者: Hiroki Honma

高マッハ数で伝播する衝撃波背後のCARS法による気体分子振動・回転温度計測

使用 CARS 方法测量高马赫数冲击波传播的气体分子振动和旋转温度

• 发表时间: 2004
• 期刊: 平成16年度宇宙航行の力学シンポジウム(H16年12月、JAXA-ISAS) 講演集
• 作者: 前野一夫;豊田和弘;安藤広行;宮崎勝巳
• 通讯作者: 宮崎勝巳

衝撃波発生装置及びそれを用いた分光システム

冲击波发生器和使用它的光谱系统

• 发表时间: 2004