EXPERIMENTAL AND APPLICATIVE STUDIES ON CAVITATION BUBBLE DYNAMICS IN CRYOGENIC LIQUID HYDROGEN

低温液氢空化气泡动力学实验与应用研究

• 批准号: 63850018
• 负责人: MAENO Kazuo
• 金额: $ 10.43万
• 依托单位: MURORAN INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63850018/
• 关键词: CRYOGENICS; LIQUID HYDROGEN; CAVITATION; BUBBLE DYNAMICS; CRYOSTAT; LASER-INDUCED BUBBLES; GIANT PULSE LASER; キャビテーション; 気泡; レーザー照射; パルスレーザー

The experimental and analytical investigations have been conducted on the dynamics of cavitation vapor bubbles in cryogenic liquids including liquid hydrogen. With the rapid progress of cryogenic engineerings such as aerospace technology and LNG plants, it becomes necessary to study cavitation phenomena in cryogenic fluids. Laser-induced cavitation bubbles have been investigated by many researchers. By applying the laser-induced bubble generation, the bubble itself is precisely controlled both temporally and spatially. This technique does not cause any large disturbances in the surrounding liquids.In this research, bubbles are produced by focusing a giant pulse of a Q-switched ruby laser into cryogenic liquid (liquid nitrogen, hydrogen, and Ar) in a cryostat. The dynamics of the laser-induced bubbles in cryogenic liquids were studied by means of high-speed photography using a Imacon-790 camera with framing rates of up to 100000frames/s. The impact pressure was measured by PCB piezoelec … More tric transducer. A numerical analysis was also developed for the physical behavior of the bubble in cryogenic liquids. The mathematical formulation takes into account the effects of liquid inertia, the none-equilibrium condensation of vapor, and the heat transfer at the bubble wall. The numerical solutions were compared to the experimental results on single bubble motion in cryogenic liquid. The main results are summarized as follows: (1) The aberration of the focusing lens must be removed, in order to produce a highly spherical bubble in the cryostat. An iris has been used, and the bubble behaviors in cryogenic liquids were observed. (2) Bubble dynamics in liquid nitrogen, hydrogen, and argon were simulated numerically. In the case of including heat transfer at the bubble wall, the bubble indicates a violent behavior. The bubble motion received a very strong influence by the coefficient for evaporation and condensation (non-equilibrium parameters). The numerical results were compared with experimental results. Less

对包括液氢在内的低温液体中空化气泡的动力学进行了实验和分析研究。随着航空航天技术和液化天然气工厂等低温工程的快速发展，研究低温流体中的空化现象变得很有必要。许多研究人员已经研究了激光引起的空化气泡。通过应用激光诱导气泡生成，气泡本身在时间和空间上都受到精确控制。这项技术不会对周围液体造成任何大的扰动。在这项研究中，通过将 Q 开关红宝石激光器的巨大脉冲聚焦到低温恒温器中的低温液体（液氮、氢气和氩气）中来产生气泡。使用帧速率高达 100000 帧/秒的 Imacon-790 相机，通过高速摄影研究了低温液体中激光诱导气泡的动力学。冲击压力由 PCB 压电传感器测量。还对低温液体中气泡的物理行为进行了数值分析。数学公式考虑了液体惯性、蒸汽非平衡冷凝以及气泡壁传热的影响。将数值解与低温液体中单气泡运动的实验结果进行比较。主要结果概括如下： (1)为了在低温恒温器中产生高度球形的气泡，必须消除聚焦透镜的像差。使用虹膜，观察低温液体中的气泡行为。 (2)对液氮、液氢、液氩中的气泡动力学进行了数值模拟。在包括气泡壁处的传热的情况下，气泡表现出剧烈的行为。气泡运动受到蒸发和冷凝系数（非平衡参数）的强烈影响。将数值结果与实验结果进行了比较。较少的

项目成果

Shingo YOKOYAMA et al.: "Shock Wave and Vapor Bubble Collapse in Cryogenic Liquids (Experiments for R-12) (in Japanese)" Abstracts of 29th Meeting of JSME Hokkaido Branch, JSME. No.882-2. 62-63 (1988)

Shingo YOKOYAMA 等人：“低温液体中的冲击波和蒸汽泡破裂（R-12 实验）（日语）”JSME 北海道分会第 29 次会议摘要，JSME。

Kazuo MAENO;et al.: Proceedings of the 16th International Symposium on Space Technology and Science. 787-792 (1988)

Kazuo MAENO；等人：第 16 届国际空间技术与科学研讨会论文集。

Kazuo MAENO et al.: "Shock Wave Propagation in Low Temperature Refrigerant R-12 and Other Gases" Proceedings of the 16th International Symposium on Space Technology and Science. 787-792 (1988)

Kazuo MAENO 等人：“低温制冷剂 R-12 和其他气体中的冲击波传播”第 16 届国际空间技术与科学研讨会论文集。

Kazuo MAENO;et al.: The 2nd Asian Thermophysical Properties Conference(Abstract Accepted). (1989)

Kazuo MAENO；等人：第二届亚洲热物理性质会议（摘要已接受）。

前野一夫他: "極低温流体中のレ-ザ-照射によるキャビテ-ション気泡実験(液体窒素に対する結果)" 第21回流体力学講演会講演集. 252-255 (1989)

Kazuo Maeno 等人：“低温流体中激光照射的空化气泡实验（液氮结果）”第 21 届流体力学会议记录 252-255 (1989)。