Micro-scale Analysis of Non-equilibrium Phenomena in Highly Rarefied Gas Flows

高度稀薄气流中非平衡现象的微观分析

• 批准号: 13450072
• 负责人: NIIMI Tomohide
• 金额: $ 10.11万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450072/
• 关键词: Micro-Scale; Highly Rarefied Gas Flow; REMPI; Gas-Surface Interaction; Free Molecular Flow; PSP; Non-Equilibrium; Temperature Measurement; 共鳴多光子イオン化法(REMPI); ファントム粒子モデル; 面一分子干渉

In this study, we develop the experimental system for 2R+2 N_2-REMPI and apply it to measurement of rotational temperature in a supersonic free molecular nitrogen flow. In the 2R+2 N_2-REMPI technique, nitrogen molecules are ionized, the nitrogen ions are detected as a signal and its spectra depending on the wavelength of an irradiated laser beam are analyzed to measure the rotational temperature through the Boltzmann plot. However, it is found from the experimental results that the number of molecules in the rotational states is not given by the Boltzmann distribution at the measurement point, showing the so-called non-Boltzmann distribution. Now, we are carrying out experiments changing the source pressure and the measurement point as parameters, to clarify the transition from the equilibrium to non-equilibrium in the rotational mode and to obtain the functional form of the non-Boltzmann distribution.The pressure range of Pressure sensitive paints (PSP) has been limited above 1 Torr (133.3 Pa) and there is no application to lower pressure range because the pressure sensitivity seems to be not so high in that range. In this study, we apply three types of PSP to the rarefied gas flow mainly lower than 1 Torr and examine those fundamental property, such as pressure/temperature sensitivity and time decay of luminescence and so on. Both PtTFPP/poly(TMSP) and Bath-Ru/AA have high sensitivity in the range of pressure lower than 1 Torr. Since the absolute luminescence intensity of PtTFPP/poly(TMSP) is higher than that of Bath-Ru/AA, however, it may better to use the former, judging from a point of S/N.Using laser induced fluorescence (LIF) of NO seeded in the carrier gas N_2 and a pressure sensitive paint [PtTFPP/poly(TMSP)], we visualize and analyze the flow field structures around the linear-type aerospike nozzle and the complicated pressure distribution on the spike surface successfully.

在本研究中，我们开发了2R+2 N_2-REMPI实验系统，并将其应用于超音速自由分子氮流中旋转温度的测量。在2R+ 2n_2 - rempi技术中，氮分子被电离，氮离子作为信号被检测，并通过玻尔兹曼图分析其随辐照激光束波长的光谱来测量旋转温度。然而，从实验结果中发现，处于转动态的分子数并不是由测点的玻尔兹曼分布给出的，表现为所谓的非玻尔兹曼分布。现在，我们正在进行改变源压力和测量点作为参数的实验，以阐明旋转模式下从平衡到非平衡的转变，并获得非玻尔兹曼分布的函数形式。压敏涂料（PSP）的压力范围被限制在1torr （133.3 Pa）以上，并且没有应用于更低的压力范围，因为在该范围内压力灵敏度似乎不是那么高。在本研究中，我们将三种类型的PSP应用于主要低于1 Torr的稀薄气体流，并研究了其基本性质，如压力/温度敏感性和发光时间衰减等。PtTFPP/poly（TMSP）和Bath-Ru/AA在低于1 Torr的压力范围内均具有较高的灵敏度。然而，由于PtTFPP/poly（TMSP）的绝对发光强度高于Bath-Ru/AA，从S/N的角度来看，使用前者可能更好。利用载气N_2中注入NO的激光诱导荧光（LIF）和压敏涂料[PtTFPP/poly(TMSP)]，成功地可视化和分析了线性气刺喷嘴周围的流场结构和喷嘴表面复杂的压力分布。

项目成果

新美 智秀: "低密度気体流中におけるPSPの評価と応用"可視化情報. Nol.21,(Suppl.). 317-320 (2002)

Tomohide Niimi：“PSP 在低密度气流中的评估和应用”可视化信息，（增刊）217-320。

T.Niimi, H.Mori, T.Ishida, A.Takasu, K.Niwa: "Application of REMPI to Highly Rarefied Gas Flows"19^<th> Int.Congress on Instrumentation in Aerospace Simulation Facilities. 2001-8. 256-261 (2001)

T.Niimi、H.Mori、T.Ishida、A.Takasu、K.Niwa：“REMPI 在高度稀薄气流中的应用”第 19 届航空航天模拟设施仪表国际大会。

新美 智秀: "Application of REMPI to Highly Rarefied Gas Flows"19^<th> int. Congress on Instrumentation in Aerospace Simulation Facilities. 256-261 (2001)

Tomohide Niimi：“REMPI 在高度稀薄气流中的应用”第 19 届航空航天模拟设施仪表大会。

新美 智秀: "可視化情報ライブラリー3,光学的可視化法"朝倉書店. 178 (2001)

新见智秀：“可视化信息库3，光学可视化方法”朝仓书店178（2001）。

新美 智秀: "低密度気体流中におけるPSPの評価と応用"可視化情報. Vol.21, Suppl.. 317-320 (2002)

Tomohide Niimi：“低密度气流中 PSP 的评估和应用”可视化信息，第 21 卷，增刊 317-320 (2002)。