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breakup Structure of Two-phase Jets with Various Momentum Flux from a Porous Injector

Journal of Thermal Science 2014年第1期23卷 60-67页

作者： Inchul Lee Dohun Kim Jaye Koo Graduate Student Korea Aerospace University School of Aerospace and Mechanical Engineering Korea Aerospace University

Spray structure and atomization characteristics were investigated through a comparison of a porous and a shear coaxial injector. The porous injector shows better atomization performance than the shear coaxial injector. To in- crease atomization performance and mixing efficiency of two-phase jets, a coaxial porous injector which can be applicable to liquid rocket combustors was designed and tested. The characteristics of atomization and spray from a porous and a shear coaxial injector were characterized by the momentum flux ratio. The breakup mechanism of the porous injector is governed by Taylor-Culick flow and axial shear forces. Momentum of injected gas flow through a porous material which is composed of sintered metal is radically transferred to the center of the liquid column, and then liquid column is effectively broken up. Although the shapes of spray from porous and shear co- axial jets were similar for various momentum ratio, spray structures such as spray angle and droplet sizes were different. As increasing the momentum flux ratio, SMD from the porous injector showed smaller value than the shear coaxial injector

关键词： Porous injector Shear coaxial injector breakup mechanism Momentum flux ratio

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Transformation of single drop breakup from binary to ternary and multiple in turbulent jet flows

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Chinese Journal of Chemical Engineering 2021年第6期34卷 32-39页

作者： Wenjun Liang Dengfei Wang Meijuan Qian Ziqi Cai Zhipeng Li Zhengming Gao Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Chemical Resource Engineering School of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China Daqing Petrochemical Research Center Petrochemical Research InstituteChina National Petroleum CorporationDaqing 163714China

By releasing liquid drops in turbulent jet flows,we investigated the transformation of single drop breakup from binary to ternary and *** oil and deionized water were the dispersed phase and continuous phase,*** probability of binary,ternary,and multiple breakup of oil drops in jet flows is a function of the jet Reynolds *** address the underlying mechanisms of this transformation of drop breakup,we performed two-dimensional particle image velocimetry(PIV)experiments of single-phase jet *** the combination of drop breakup phenomenon and two-dimensional PIV results in a single-phase flow field,these transformation conditions can be estimated:the capillary number ranges from 0.17 to 0.27,and the Weber number ranges from 55 to 111.

关键词： Drop Multiple breakup Jet flows PIV breakup mechanism

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Relative probabilities of breakup channels in reactions of^(6.7)Li with^(209)Biat energies around and above the Coulomb barrier

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Chinese Physics C 2021年第5期45卷 141-148页

作者： Yong-Jin Yao Cheng-Jian Lin Lei Yang Nan-Ru Ma Dong-Xi Wang Gao-long Zhang Guang-Xin Zhang Hui-Ming Jia Feng Yang Fu-Peng Zhong Pei-Wei Wen Xiu-Bo Qin Hong-Ming Zhao State Key Laboratory of Software Development Environment Beihang UniversityBeijing 100191China School of Physics Beihang UniversityBejing 100191China China Institute of Atomic Energy Beijing 102413China Guangxi Normal University Guangxi 541004China X Lab the Second Academy of CASICBejjing 100854China

Coincidence measurements of breakup fragments in reactions of^(6.7)with^(209)Bi at energies around and above the Coulomb barrier were carried out using a large solid-angle covered detector *** the Q values along with the relative energies of the breakup fragments,different breakup components(prompt breakups and delayed breakups)and different breakup modes(α+t,α+d,α+p,andα+α)are distinguished.A new breakup mode,α+t,is observed in^(6)Li-induced reactions at energies above the Coulomb *** between breakup modes and breakup components as well as their variations with the incident energy are *** results will help us better understand the breakup effects of weakly bound nuclei on the suppression of a complete fusion,particularly for the above-barrier energies.

关键词： breakup mechanism coincidence measurement weakly bound nucleus

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单晶铝中微喷射的分子动力学研究

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Acta Mechanica Sinica 2023年第3期39卷 7-25页

作者：杨鑫赵晗高学军雷刚陈臻林 College of Environment and Civil Engineering Chengdu University of TechnologyChengdu 610059China School of Intlligent Manufacturing Chengdu Technological UniversiyChengdu 611730China Faculty of Quality Management and Inspection Yibin UniversityYibin 644000China

采用非平衡分子动力学模拟方法,研究了方形冲击波在含有圆锥和正弦缺陷的单晶铝中一维和二维的微射流演化.利用正向和反向粒子追踪技术获得了微射流的粒子源,发现微射流不同部位的粒子源结构与缺陷类型密切相关,微射流的形成是从缺陷表... 详细信息

采用非平衡分子动力学模拟方法,研究了方形冲击波在含有圆锥和正弦缺陷的单晶铝中一维和二维的微射流演化.利用正向和反向粒子追踪技术获得了微射流的粒子源,发现微射流不同部位的粒子源结构与缺陷类型密切相关,微射流的形成是从缺陷表层到内层的分层聚集过程.锥形情况下的射流头部速度最初急剧增加,然后快速下降至恒定速度;锥形和正弦情况下的喷射体积先经历非线性增加,后保持不变.通过进一步对喷射粒子数量、密度、速度和温度之间的关系分析,发现在圆锥和正弦情况下,当冲击速度为6 km/s时喷射物速度在冲击方向上基本呈线性变化,且射流最大速度位于射流头部;但在正弦情况下,当冲击速度为2 km/s时喷射物速度在冲击方向上波动变化,射流头部速度低于为头部后侧的速度.更重要的是,本文揭示了两种机制,即一维射流的颈缩与二维射流的孔洞增长和贯穿,它们主导了射流的破碎.实际上,速度、温度和压力的扰动都有助于射流破碎,其中速度扰动对其破碎具有最重要影响.此外,速度梯度会引起孔洞边界变厚,从而导致射流头部密度增加.

关键词： Non-equilibrium molecular dynamics Single crystal Al Micro jet Ejecta source breakup mechanism

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