Numerical and Experimental Study on the Cavitating Flow Characteristics of Pressurized Liquid Nitrogen in a Horizontal Rectangular Nozzle
Numerical and Experimental Study on the Cavitating Flow Characteristics of Pressurized Liquid Nitrogen in a Horizontal Rectangular Nozzle
复制标题
DOI：
10.1115/1.1928916
复制
发表时间：
2005-11
影响因子：
1
通讯作者：
J. Ishimoto;M. Onishi;K. Kamijo
中科院分区：
文献类型：
--
作者：
J. Ishimoto;M. Onishi;K. Kamijo
基于非定常热、非平衡双流体模型的数值分析以及流动可视化测量，对水平矩形喷嘴中加压液氮的低温空化流动特性的热力学效应进行了精确研究。根据数值模拟和实验结果，提出了极具实用价值的成果，以实现一类低温两相冷却系统的进一步发展和高性能。通过数值模拟和实验发现，低温空化起始发生在入口喉部壁面附近，且空化泡在此处生长。研究还发现，加压液氮中空化起始、云状空化泡生长以及气相扩散行为随时间的连续过程和表现，不仅受气相动量方程中几种附加力的主导，还受低温流体固有特性对空化泡产生的热力学效应的影响。特别是在相同温度和云状空化泡相同纵横比的条件下，尽管空化数较大，但在高雷诺数区域常常能发现类似的空化产生行为。
The thermodynamic effect on cryogenic cavitating flow characteristics Of pressurized liquid nitrogen in a horizontal rectangular nozzle is precisely investigated by numerical analysis based on an unsteady thermal, nonequilibrium two-fluid model and by flow visualization measurement. According to the numerical and experimental snick', the sufficiently useful results are proposed to realize the further development and high performance of a type of cryogenic two-phase cooling system. It is numerically and experimentally found that the inception of cryogenic cavitation occurs and the cavity grows in the vicinity of the wall surface of the inlet throat section. It is also found that the continuous process and behavior of cavitation inception, cloud cavity growth, and gas phase diffusion behavior with time in pressurized liquid nitrogen are dominated not only by several additional forces in the gas-phase momentum equation, but also by the thermodynamic effect that acts on the cavitation bubbles due to the inherent properties of cryogenic fluid. Especially under conditions of the same temperature and same aspect ratio of the cloud cavity, similar generating behavior of cavitation can be often found in the high Reynolds number region in spite of large cavitation number.