航天推进技术研究院主办
[1]陈家成,梁文栋,李子亮,等.液氮非定常空化流动时空演化特征试验[J].火箭推进,2024,50(06):116-126.[doi:10.3969/j.issn.1672-9374.2024.06.010]
CHEN Jiacheng,LIANG Wendong,LI Ziliang,et al.Experimental investigation of temporal and spatial behaviors in liquid nitrogen cavitating flows[J].Journal of Rocket Propulsion,2024,50(06):116-126.[doi:10.3969/j.issn.1672-9374.2024.06.010]
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CHEN Jiacheng,LIANG Wendong,LI Ziliang,et al.Experimental investigation of temporal and spatial behaviors in liquid nitrogen cavitating flows[J].Journal of Rocket Propulsion,2024,50(06):116-126.[doi:10.3969/j.issn.1672-9374.2024.06.010]
液氮非定常空化流动时空演化特征试验
《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]
卷:
50
期数:
2024年06期
页码:
116-126
栏目:
目次
出版日期:
2024-12-25
- Title:
- Experimental investigation of temporal and spatial behaviors in liquid nitrogen cavitating flows
- 文章编号:
- 1672-9374(2024)06-0116-11
- Keywords:
- liquid nitrogen; cavitating flows; schlieren optical system; density gradient; unsteady evolution
- 分类号:
- V431; TV131.32
- 文献标志码:
- A
- 摘要:
- 基于低温介质空化流动实验装置和高速纹影测量系统,研究了液氮非定常空化流动密度分布的时空演化特征。试验中应用高速摄影技术与纹影测量技术对温度为77 K的液氮在不同空化数下的空穴结构与密度分布进行了综合测量。基于试验结果,分析了初生空化、片状空化以及大尺度的云状空化这3种典型低温空化流型的非定常特性与空穴结构演化。研究结果表明:①通过纹影测量系统捕捉到了在背光试验中观察不到的空化引起的密度梯度结构。②在无空化流动时,液氮经过喉口未发生明显的密度变化,在空化条件下,经过喉口的液氮空化流动中观察到了空化流动的密度梯度,且这一区域出现在附着型空穴上方,起始于喉口,离开空穴时消失; ③空化区域汽液混合物声速远小于液相,局部马赫数增大,介质受到压缩后密度发生改变,产生条纹状密度梯度结构; ④条纹结构区域密度梯度的变化对应于当地空化流动时空演化特征。
- Abstract:
- The objective of this paper is to build a schlieren optical system based on the experimental device for cavitation flow in cryogenic fluids, and to study the spatial and temporal characteristics of the density distribution in liquid nitrogen cavitating flows. In the experiment, the structure and density distribution of liquid nitrogen cavities at different cavitation numbers for 77 K were measured by applying high-speed photography and chlieren technology. The unsteady behaviors of incipient cavitation, sheet cavitation, and large-scale cloud cavitation in liquid nitrogen were investigated. The results show that: ① The schlieren optical system can capture the cavitation-induced density gradient that is not observed in backlighting experiments. ② The significant change of density in liquid nitrogen is not observed under the non-cavitation condition. The rectangular structures are observed in the cavitating flows. This demonstrates that the density of the liquid phase changes. The rectangular structure appears above the attached cavity, begins at the throat, and disappears when leaving the cavity. ③ The sound velocity of the vapor-liquid mixture in the cavitation region is much smaller than that of the liquid phase, and the local Mach number increases. The density of the fluid changes as it is compressed, producing a striated density gradient structure. ④ The unsteady characteristics of the rectangular structures are consistent with the cavitating flows.
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备注/Memo
收稿日期:2024- 01- 16修回日期:2024- 08- 14
基金项目:国家自然科学基金(52009001); 北京理工大学科技创新计划(2024CX06078); 重庆市自然科学基金(cstc2021jcyj-msxmX1046)
作者简介:陈家成(1997—),男,博士,研究领域为低温空化与空泡动力学。
通信作者:陈泰然(1990—),男,博士,副教授,研究领域为低温相变与传热。
更新日期/Last Update:
1900-01-01