NONEEQUILIBRIUM PHNOMENA OF LOW-DENSITY JETS IN SPACE

太空低密度射流的非平衡现象

• 批准号: 08044155
• 负责人: NISHIDA Michio
• 金额: $ 6.66万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044155/
• 关键词: Space; Jets; Low Density; Nonequilibrium; Rarefied Gas Dynamics; 希薄気体力学; Jet; Space; Low Density; Nonequilibrium

The following results were obtained :1) The DSMC analysis for investigating the free jet structure issuing from an orifice into a low-pressure circumstance has been established, whreby the free jet structure for various Knudsen numbers has been revealed.2) Jet impingement problems in space have been solved using the DSMC and the flow fields of nomal, parallel and oblique jet impingements have been numerically analyzed. The numerical results have been compared with the experiments made in German Aerospace Research Establishment and good agreements have been obtained.3) Nonequilibrium phenomena in arc-heated high-temperature gas jet considered for an arc jet thruster and thermal protection system experiment have been numerically investigated using a six temperature model, namely in a case of air, translational temperature, nitrogen vibrational temperature, oxygen vibrational temperature, nitric oxide vibrational temperature, nitric oxide ion vibrational temperature and electron temperature. Numerical results show that there exists thermal nonequilibrium.4) REMPI (Resonantly Enhanced Multiohoton Ionization) technique has been developed and the fundamental properties of the REMPI spectra have been investigated. The modeling of the ionization process is derived and the ion current is predicted from the solution. In addition, the theoretical REMPI spectra are calculated and compared with the experiments.5) Flow visualization technique using a laser-induced fluorescence method has been developed and applied to the investigation of three-dimensional free jet structure.

获得以下结果：1）建立了研究从孔口进入低压环境的自由射流结构的DSMC分析，从而揭示了不同努森数下的自由射流结构。2）利用DSMC解决了空间射流冲击问题，并对法向、平行和倾斜射流冲击的流场进行了数值分析。数值结果与德国航空航天研究所的实验进行了比较，得到了良好的一致性。 3)采用空气、平移温度、氮气振动温度、氧气振动温度、一氧化氮六种温度模型，对电弧喷射推进器和热保护系统实验中考虑的电弧加热高温气体射流中的非平衡现象进行了数值研究。 振动温度、一氧化氮离子振动温度和电子温度。数值结果表明存在热非平衡。4)发展了REMPI(共振增强多光子电离)技术并研究了REMPI谱的基本性质。推导出电离过程的模型，并根据解预测离子电流。此外，还计算了理论REMPI光谱，并与实验进行了比较。5)开发了利用激光诱导荧光方法的流动可视化技术，并将其应用于三维自由射流结构的研究。

项目成果

松本尚之、山本靖人、西田迪雄: "超音速非平衡自由噴流の計算に及ぼす温度モデルの効果" 日本機械学会論文集(B編). 62・600. 3058-3063 (1997)

Naoyuki Matsumoto、Yasuto Yamamoto、Michio Nishida：“温度模型对超音速非平衡自由射流计算的影响”日本机械工程学会会刊（编辑 B）3058-3063（1997 年）。

T.Niimi: "Visualization of a Supersonic Flow Using 02-LIPF" JSME Int.J.39-3. 533-539 (1997)

T.Niimi：“使用 02-LIPF 实现超音速流的可视化”JSME Int.J.39-3。

H.Oguchi, T.Soga: "Computation of Rarefied Gas Flows at Near-Equilibrium State by Discrete-Velocity Ordinate Method" Rarefied Gas Dynamics(Peking univ.Press). 285-290 (1997)

H.Oguchi、T.Soga：“用离散速度纵坐标法计算近平衡状态下的稀薄气体流动”稀薄气体动力学（北京大学出版社）。

新美 智秀: "02-LIPFによる超音速流れの可視化" 日本機械学会論文集(B編). 62-594. 628-636 (1996)

Tomohide Niimi：“使用 02-LIPF 实现超音速流的可视化”日本机械工程师学会会议录（B 版）628-636（1996 年）。

M.Nishida,M.Matsumoto: "Thermochemical Nonequilibrium in Rapidly Expanding Flows of High-Temperature Air" Zeitschrift fuer Naturforschung. (in press). (1997)

M.Nishida，M.Matsumoto：“高温空气快速膨胀流中的热化学非平衡”Zeitschrift fuer Naturforschung。