摘要
为深化对旋涡热强化效应的认识,针对特殊旋涡——龙卷旋涡开展冷态流动特性的实验研究。测量了不同旋射管进气道面积对龙卷旋涡初始真空度的影响及强旋状态下的速度分布。结果表明:旋射管质量流量对初始真空度具有决定性影响,质量流量越高,初始真空度绝对值越大;龙卷旋涡的各速度分量均可用半经验涡模型统一表征,速度分布随旋流强度的降低出现显著转变;中空结构的出现及维持的根本原因是较高的旋流强度;径向卷吸的出现标志着旋流强度的显著降低。该研究成果丰富了对龙卷旋涡的流体力学认识,为揭示旋流热强化效应机理的研究提供了重要参考。
Vortex thermal-intensification was studied by measuring the cold flow characteristics of a tornado-like vortex.The experiments measured the effect of the inlet channel area of a vortex generator on the initial vacuum and velocity distribution with strong swirl.The results show that the air mass flow rate strongly influences the initial vacuum with the vacuum increasing with the mass flow rate.All the velocity components of the tornado-like vortex can be described by semi-empirical vortex models with the velocity distribution varying significantly as the swirl intensity decreases.A strong swirl intensity is found crucial to the formation and maintenance of the hollow-core structure.The occurrence of radial entrainment indicates a significant decrease in the swirl intensity.These observations extend the understanding of the tornado-like vortex related to vortex thermal-intensification and provide important reference for exploring these mechanisms in the future.
作者
胡羽
龚迎莉
孙新玉
黄兴亮
祁海鹰
HU Yu;GONG Yingli;SUN Xinyu;HUANG Xingliang;QI Haiying(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第3期239-247,共9页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(51176092).
关键词
旋涡热强化
龙卷旋涡
旋射管
速度分布
涡模型
vortex thermal-intensification
tornado-like vortex
vortex generator
velocity distribution
vortex model
