Unsteady cavitation characteristics of liquid nitrogen flows through venturi tube
Unsteady cavitation characteristics of liquid nitrogen flows through venturi tube
复制标题
液氮流经文丘里管的非定常空化特性
DOI：
10.1016/j.ijheatmasstransfer.2017.04.036
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发表时间：
2017-09
影响因子：
5.2
通讯作者：
Si Minqiang
中科院分区：
文献类型：
--
作者：
Zhu Jiakai;Xie Huangjun;Feng Kesong;Zhang Xiaobin;Si Minqiang
在可变压比风洞中对液氮流过透明文丘里管的动态空化特性进行了实验研究。给出了不同压比条件下的温度、压力和流量随时间和空间的变化规律，以及利用高速摄像机对空化非定常特性的直观观察。通过对实测动压数据和动压图像的分析发现，随着压比的增大，空泡脱落频率和空泡长度呈线性增大，而压力幅值呈指数增大。特别地，当压比超过2.23时，观察到激波诱导的凝结前缘在附连空腔内向上游传播。波是由空泡云的溃灭产生的，被认为是空泡脱落的主要机制。建立了考虑热效应的一维凝结前沿速度理论方程。并且，基于冷凝波速度的Strouhal数被发现对于水和液氮空化都接近0.5，这可以用来估计低温和室温流体的脱落频率。研究了初始空化的发展过程和特性。本研究的数据可以作为CFD代码验证的基准。
The dynamic cavitation characteristics of liquid nitrogen flow through a transparent venturi tube are experimentally investigated in a variable pressure ratio tunnel. The common results are presented at different pressure ratio, including the temporal and spatial changes of the temperature and pressure as well as the flow rate, together with the visual observation of the cavitation unsteady behaviors using the high-speed camera. The analyses on the measured dynamic pressure data and images reveal that the shedding frequency and length of cavity linearly increases, while the pressure amplitude exponentially increases, as the pressure ratio increases. Specially, a shock wave induced condensation front is observed propagating upstream within the attached cavity when the pressure ratio approximately exceeds 2.23. The wave generates from the collapse of the cavitation cloud and is considered to be the predominate mechanism of the cavitation shedding. A one dimensional theoretical equation in consideration of thermal effect is developed to estimate the speed of condensation front. And, the Strouhal number based on the condensation wave speed is found to be close to 0.5 for both water and liquid nitrogen cavitation, which can be utilized to estimate shedding frequencies for both cryogenic and room-temperature fluids. The initial cavitation development and characteristics are also investigated. The data from the present study can be used as a bench mark for CFD code validations.
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影响因子：
7.2
作者：
zhang
通讯作者：
zhang
文丘里管中整体空化动态行为的实验研究，特别强调空腔长度变化
影响因子：
3.8
作者：
Long Xinping;Zhang Junqiang;Wang Jiong;Xu Maosen;Lyu Qiao;Ji Bin
通讯作者：
Ji Bin
影响因子：
3.9
作者：
Shanshan Xu;Y. Qiao;Xiaodong Liu;C. Church;M. Wan
通讯作者：
Shanshan Xu;Y. Qiao;Xiaodong Liu;C. Church;M. Wan
影响因子：
2.1
作者：
K. Ohira;T. Nakayama;T. Nagai
通讯作者：
K. Ohira;T. Nakayama;T. Nagai
影响因子：
1.5
作者：
Hoseyn Sayyaadi
通讯作者：
Hoseyn Sayyaadi