Study on Instabilities of Two-Phase He II/vapor flow in a pipe

管道内两相He II/蒸气流不稳定性研究

• 批准号: 13555265
• 负责人: KAMIJO Kenjiro
• 金额: $ 8.13万
• 依托单位: Tohoku 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 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13555265/
• 关键词: cryogenic fluid; multiphase flow; flow instability; thermodynamic effect; cavitation model; drift-flux model; supersaturated state; 液体ロケット; 液体酸素; 高密度化; キャビテーション; 気泡核; ターボポンプ; インデューサ

The aim of this research is to investigate the instability of supersaturated cryogenic two-phase flow experimentally and theoretically. This analysis is useful to the improvement of cryogenic apparatus such as turbopumps of rocket engine.In this year numerical simulations are performed about the two-phase flow in the nozzle. The drift-flux model is used as the cavitation model and axisymmetric system is also used. The phase change is considered. As the results, the effect of phase change on flow field of cryogenic fluid appears the suppression of the increase of void fraction at the center of wake vortex generated downstream of nozzle throat. Moreover, it is confirmed that the counter flow generates at the wall of the nozzle as the wake vortex downstream of the nozzle throat grows up.Next, experiments are performed about the visualization of two-phase flow of supersaturated cryogenic fluid. The data of both instability flow and stability one are obtained. As the results, the cavitating flow at saturated state is comparatively stable and the successive generation of bubble is observed. On the contrary, the cavitating flow at supersaturated state is very unstable and arbitrary generation of bubble is observed.

本文旨在从实验和理论两方面研究过饱和低温两相流的不稳定性。本文对喷管内的两相流动进行了数值模拟，并对喷管内的两相流动进行了数值模拟。空化模型采用漂移流模型，并采用轴对称系统。考虑了相变。结果表明，相变对低温流体流场的影响表现为抑制喷管喉部下游尾迹涡中心含气率的增加。此外，还证实了随着喷管喉部下游尾涡的增长，喷管壁面上会产生逆流。接下来，进行了过饱和低温流体两相流的可视化实验。得到了不稳定流和稳定流的数据。结果表明，饱和状态下的空化流动比较稳定，并观察到气泡的连续生成。而过饱和状态下的空化流动则非常不稳定，可以观察到气泡的任意生成。

项目成果

徳増崇, 小原拓, 上條謙二郎: "分子動力学法による二原子分子液体の熱伝導率の検討"日本機械学会論文集B編. 69巻683号. 1644-1650 (2003)

Takashi Tokumasu、Taku Ohara、Kenjiro Kamijo：“使用分子动力学方法研究双原子液体的导热性”，日本机械工程学会会刊，B 版，第 69 卷，第 683 期。1644-1650（2003 年）。

S.Tsuda, T.Tokumasu, K.Kamijo, Y.Matsumoto: "Molecular Dynamics Study of Heterogeneous Bubble Nucleation in Liquid Oxygen Including Helium, Nitrogen, or Argon"Proceedings of ASME FEDSM'02. 31022 (2002)

S.Tsuda、T.Tokumasu、K.Kamijo、Y.Matsumoto：“液氧（包括氦、氮或氩）中异质气泡成核的分子动力学研究”ASME FEDSM02 论文集。

徳増崇, 上條謙二郎, 小原裕, 松本洋一郎: "二原子分子流体の熱物性に関する分子動力学的研究(分子の回転自由度の物性に及ぼす影響)"日本機械学会論文集B編. (掲載予定).

Takashi Tokumasu、Kenjiro Kamijo、Yutaka Ohara、Yoichiro Matsumoto：“双原子分子流体热性质的分子动力学研究（分子旋转自由度对物理性质的影响）”日本机械工程学会论文集，卷 B。（待发表））。

Takashi Tokumasu, Yumiko Sekino, Kenjiro Kamijo: "A New Modeling of Sheet Cavitation Considering the Thermodynamic Effects"Proceedings of CAV2003. GS-16-003 (2003)

Takashi Tokumasu、Yumiko Sekino、Kenjiro Kamijo：“考虑热力学效应的片状空化的新模型”CAV2003 论文集。

津田伸一, 徳増崇, 高木周, 松本洋一郎: "不純物混入液体における気泡核生成の分子動力学的研究"日本機械学会2003年度年次大会講演論文集. 4巻. 183-184 (2003)

Shinichi Tsuda、Takashi Tokumasu、Shu Takagi、Yoichiro Matsumoto：“杂质污染液体中气泡成核的分子动力学研究”日本机械工程师学会 2003 年年会论文集 4. 183-184（2003）。