A5066479192- Laser-Plasma Interactions and Diagnostics
- Computational Fluid Dynamics and Aerodynamics
- High-pressure geophysics and materials
- Fluid Dynamics and Turbulent Flows
- Laser-Matter Interactions and Applications
- Combustion and Detonation Processes
- Gas Dynamics and Kinetic Theory
- Fluid Dynamics and Heat Transfer
- Particle Dynamics in Fluid Flows
- Advanced Frequency and Time Standards
- Plasma and Flow Control in Aerodynamics
- Atomic and Subatomic Physics Research
- Astronomical Observations and Instrumentation
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Geophysics and Sensor Technology
- High-Velocity Impact and Material Behavior
- Astronomy and Astrophysical Research
- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Radio Astronomy Observations and Technology
- Advanced Fiber Laser Technologies
- Wireless Body Area Networks
- Scheduling and Timetabling Solutions
University of Science and Technology of China
2016-2025
Wuhan University
2024
Institute of Mechanics
2024
Chinese Academy of Sciences
2024
Western Digital (China)
2024
Center for NanoScience
2019
National Center for Nanoscience and Technology
2019
Institute of High Energy Physics
2012-2018
China Academy of Engineering Physics
2016
Shanghai Astronomical Observatory
1987-2005
The interaction of a planar shock wave with spherical gas interface (SF6 or helium) surrounded by air is studied experimentally and numerically. By means the high-speed schlieren photography high time resolutions numerical method VAS2D, detailed flow field structures including evolution interfaces development patterns are obtained. sequences frames SF6 show that refracted converges inside volume causes focusing within bubble interface, resulting in an outward jet. jet different from krypton...
Abstract The interaction of a planar shock wave with polygonal $\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq \ge =\geqslant \geq \def \Pr {\mathit {Pr}}\def \Fr {Fr}}\def \Rey {Re}}{\mathrm{N}}_2$ volume surrounded by ${\mathrm{SF}}_6$ is investigated experimentally and numerically. Three interfaces (square, triangle diamond) are formed the soap film technique developed in our previous work, which thin pins introduced as angular vertexes to...
The interaction of a planar shock wave ( $M\approx 1.2$ ) with an $\text{SF}_{6}$ polygonal inhomogeneity surrounded by air is experimentally investigated. Six polygons including square, two types rectangle, triangle, and diamond are generated the soap film technique developed in our previous work, which thin pins used as angular vertexes to avoid pressure singularities caused surface tension. evolutions shock-accelerated captured high-speed schlieren system from systems interface...
We report the first measurements of perturbation amplitude in converging Richtmyer-Meshkov instability a semiannular shock tube. At early stages, growth agrees well with impulsive model considering geometrical convergence effect. A quick decrease rate at late time, even to be negative, before reshock is observed for time. The reduction ascribed Rayleigh-Taylor stabilization caused by interface deceleration motion only presented circumstance. By reasonably evaluating stabilization, modified...
Experimental and numerical investigations on the interaction of a planar shock wave with two-dimensional (2-D) three-dimensional (3-D) light gas cylinders are performed. The effects initial interface curvature flow morphology, pattern, vorticity distribution movement emphasized. In experiments, wire-restriction method based soap film technique is employed to generate N $_{2}$ surrounded by SF $_{6}$ well-characterized shapes, including convex cylinder, concave cylinder minimum-surface...
Richtmyer–Meshkov (RM) instability is regarded as a central role for understanding the hydrodynamic processes involved in inertial confinement fusion, supersonic combustion and supernova explosion. Because of its academic implication engineering applications, RM has received much attention since it was proposed. As an important tool studying instability, shock tube experiment on shock–fluid interface interaction been widely adopted great progress achieved past decades. The generation wave,...
A simple but effective technique is proposed to generate cylindrical converging shock waves. The dynamics employed design a curved wall profile of the test section in tube. When planar wave propagates forward along wall, disturbances produced by would continuously propagate surface and bend wave. As an example, for incident Mach number M0=1.2 angle 15° tested numerically experimentally. Both numerical experimental results show perfect circular front, which validates our method.
The Richtmyer–Meshkov instability on a three-dimensional single-mode light/heavy interface is experimentally studied in converging shock tube. tube has slender test section so that the non-uniform feature of shocked flow amply exhibited long testing time. A deceleration phenomenon evident unperturbed subjected to shock. presents characteristics because its minimum surface feature, which leads stratified evolution interface. For symmetry interface, it quantitatively found perturbation...
Experiments on Richtmyer–Meshkov instability of quasi-single-mode interfaces are performed. Four air/ $\text{SF}_{6}$ with different deviations from the single-mode one generated by soap film technique to evaluate effects high-order modes amplitude growth in linear and weakly nonlinear stages. For each case, two initial amplitudes considered highlight high-amplitude effect. saw-tooth high amplitude, a cavity is observed at spike head, providing experimental evidence for previous numerical...
‘Freeze-out’ of amplitude growth, i.e. the growth stagnation a shocked helium–air interface, is realized through reflected shock, which produces baroclinic vorticity opposite sign to that deposited by first shock. Theoretically, model constructed calculate relations among initial parameters for achieving freeze-out. In particular, if within linear regime at arrival time interval between impacts two shock waves linearly related perturbation wavelength, and independent amplitude....
Experimental and numerical studies on the evolution of shock-accelerated SF6/air interface with small initial amplitude are conducted. The effect compressibility early development perturbation is highlighted by varying shock intensity fluid properties. startup process analyzed when rarefaction waves reflected characteristic time provided. relationship between phase inversion under different incident strengths clarified. According to time, a new start point for normalization given, which can...
The evolution of a spherical gas interface under reshock conditions is experimentally studied using the high-speed schlieren photography with high time resolutions. A number experimental sets helium or SF6 bubble surrounded by air for seven different end wall distances have been performed. Distinct flow structures are observed due to additional vorticity and wave configuration caused reshock. In air/helium case, deformation reshocked dependent on development penetrating jet along symmetry...
The interaction of cylindrical converging shock waves with a polygonal heavy gas cylinder is studied experimentally in vertical annular diaphragmless tube. reliability the tube facility verified advance by capturing movements during convergence and reflection processes using high-speed schlieren photography. Three types air/SF 6 interfaces cross-sections an octagon, square equilateral triangle are formed soap film technique. A laser sheet imaging method employed to monitor evolution three...
Abstract The interaction of a cylindrical converging shock wave with an initially perturbed gaseous interface is studied experimentally. generated in ordinary tube but specially designed test section, which the incident planar directly converted into one. Two kinds typical initial interfaces involving gas bubble and cylinder are employed. A high-speed video camera combined schlieren or Mie scattering photography utilized to capture evolution process flow structures. distribution baroclinic...
Interactions of a planar shock wave with two-dimensional (2D), three-dimensional (3D) concave, and 3D convex SF6 cylindrical bubbles surrounded by air are studied both experimentally numerically. The effects initial interface curvature on the bubble deformation propagation highlighted. generated wire-restriction method based soap-film technique, their shapes well controlled adjusting pressure difference across interface. high-speed schlieren results demonstrate that evolving interfaces...
Shock-tube experiments and theoretical studies have been performed to highlight mode-coupling in an air–SF $_6$ –air fluid layer. Initially, the two interfaces of layer are designed as single mode with different basic modes. It is found that perturbed become closer, interface coupling induces a from on each interface. Then further generates new Based linear model (Jacobs et al. , J. Fluid Mech. vol. 295, 1995, pp. 23–42), modified established by considering accelerations waves’ effects...
The manipulation of the Richtmyer–Meshkov instability growth at a heavy–light interface via successive shocks is theoretically analysed and experimentally realized in specific shock-tube facility. An analytical model developed to forecast evolution before after second shock impact, possibilities for amplitude pattern are systematically discussed. Based on model, parameter conditions each scenario designed, all by altering time interval between two impacts. These findings may enhance...
We present the Flagship galaxy mock, a simulated catalogue of billions galaxies designed to support scientific exploitation mission. is medium-class mission European Space Agency optimised determine properties dark matter and energy on largest scales Universe. It probes structure formation over more than 10 billion years primarily from combination weak gravitational lensing clustering data. The breadth data will also foster wide variety analyses. simulation was developed provide realistic...
The dependence of the Richtmyer–Meshkov instability (RMI) on post-shock Atwood number ( $A_1$ ) is experimentally investigated for a heavy–light single-mode interface. We create initial interfaces with density ratios heavy to light gases ranging from 1.73 34.07, and achieve highest $|A_1|$ value reported date gaseous-interface experiments (0.95). For first time, spike acceleration observed in configuration. models start-up, linear weakly nonlinear evolution stages are evaluated over wide...
In our previous work, the technique of generating cylindrical converging shock waves based on dynamics theory was proposed. present a further study is carried out to assess influence several parameters including angle θ0, incident planar Mach number M0, and tube height h wall profile wave. Combining high-speed schlieren photography numerical simulation with theory, characteristics profiles, waves, thermodynamic properties for different controllable are analyzed. It found that these have...