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| 1 | Modeling of rotational supercavitating evaporator and the geometrical characteristics of supercavity within显示文摘In this paper,a rotational supercavitating evaporator(RSCE)was at first modeled by means of theoretical analysis approach.The geometrical characteristics of supercavity in the modeled RSCE were then studied through numerical simulations.The current research objectives consist in determination of shape of the supercavitator(which in the plane of rotation generates supercavity occupying the most volume between blades),and location of the area suitable for steam extraction by revealing the inner structure of supercavity.Analytical analysis was performed by solving empirical equations for the shape of RSCE,through which an evaluation of two-dimensional relative position of supercavity trailing edge for different shapes of the supercavitator has been realized.Numerical simulation was then carried out,by numerically solving the unsteady Navier-Stokes equations in their conservation form coupled with the Rayleigh-Plesset cavitation and Shear-Stress Transport turbulence models,for verification of the results obtained from empirical equations.Despite unreliable assumption of applicability of empirical equations we have confirmed similarity of the supercavity shapes obtained by both methods for the same RSCE.Therefore,the shape of supercavitator calculated by using empirical equations is acceptable,which provides a simple but reliable approach for design of RSCE.The inner structure of supercavity obtained by numerical simulation has indicated position and parameters for steam extraction openings for further numerical and experimental studies on the performance of RSCE.Practical application of steam or gas extraction is suggested for solving of some problems associated with cavitating pumping of cryogenic liquid. | LIKHACHEV Dmitriy S. LI FengChen | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，3： | 9 |
| 2 | 文氏管中低温流体汽蚀过程可视化实验研究显示文摘搭建了一套液氮可视化汽蚀试验台,借助高速摄像机观察了液氮汽蚀文氏管云状汽蚀的非稳态特性。给出了云状汽蚀在不同时刻的汽蚀结构,发现不同于水汽蚀有清晰的气液界面,液氮汽蚀呈两相混合云雾状。云状汽蚀表现为高度的不稳定性,除了尾部汽蚀在二次射流和湍流作用下周期性脱落外,中心汽蚀区还在二次射流作用下做上下周期性摆动。发现二次射流为非轴对称分布,对二次射流导致汽蚀区脱离壁面及摆动机理进行了分析。同时发现汽蚀的非稳态特性导致压力和流量相应非稳态波动,压力在空间波动导致了汽蚀溃灭区气相含量在空间上也呈现大小周期性排列。 | 赵东方 朱佳凯 徐璐 余柳 张小斌 陈建业 王宇辰 | 2015 | 低温工程2015，，6： | 5 |
| 3 | 节流前过冷度和压力对液氮节流特性的影响显示文摘节流在普冷领域应用广泛。其在基于林德循环、克劳德循环等低温液化循环、焦汤氦制冷系统、低温推进剂热力排气系统中也都有涉及。为了深入揭示低温流体相比室温气体的节流特殊性,设计并搭建了一套低温流体气液两相节流可视化试验系统。针对渐缩渐扩管型的节流元件,分析了节流前过冷度和压力对液氮节流特性的影响。研究表明:节流前压力一定,节流后温降及气相质量分数随节流前过冷度增加而增加;节流前过冷度一定,节流后温降及气相质量分数随节流前压力增大而增大;增大节流前压力,减小节流前过冷度,会减少节流后流体的单位质量制冷量。 | 赵芷慧 李鹏 吴栋梁 张宏彬 孙培杰 黄永华 | 2021 | 化工学报2021，72，S01： | 0 |
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