A5080828809- Laser-Plasma Interactions and Diagnostics
- Computational Fluid Dynamics and Aerodynamics
- Fluid Dynamics and Turbulent Flows
- High-pressure geophysics and materials
- Laser-Matter Interactions and Applications
- Gas Dynamics and Kinetic Theory
- Combustion and Detonation Processes
- Particle Dynamics in Fluid Flows
- nanoparticles nucleation surface interactions
- Fluid Dynamics and Heat Transfer
- Plasma and Flow Control in Aerodynamics
- Aerodynamics and Acoustics in Jet Flows
- Combustion and flame dynamics
- Laser-induced spectroscopy and plasma
- Magnetic confinement fusion research
- Spectroscopy and Laser Applications
- Electrohydrodynamics and Fluid Dynamics
- Advanced Thermodynamics and Statistical Mechanics
- Ionosphere and magnetosphere dynamics
- Fire dynamics and safety research
- High-Velocity Impact and Material Behavior
- Innovative Microfluidic and Catalytic Techniques Innovation
- Nanomaterials and Printing Technologies
- Fluid Dynamics and Thin Films
- Energetic Materials and Combustion
University of Science and Technology of China
2016-2025
Institute of Mechanics
2023-2025
Chinese Academy of Sciences
2023-2025
China Academy of Engineering Physics
2022
Institute of High Energy Physics
2012-2018
RWTH Aachen University
2006-2009
Eindhoven University of Technology
2001-2007
Low-density compressible materials enable various applications but are often hindered by structure-derived fatigue failure, weak elasticity with slow recovery speed and large energy dissipation. Here we demonstrate a carbon material microstructure-derived super-elasticity high resistance achieved designing hierarchical lamellar architecture composed of thousands microscale arches that serve as elastic units. The obtained monolithic can rebound steel ball in spring-like fashion fast (∼580 mm...
Various methods have been exploited to replicate nacre features into artificial structural materials with impressive and mechanical similarity. However, it is still very challenging produce nacre-mimetics in three-dimensional bulk form, especially for further scale-up. Herein, we demonstrate that large-sized, comprehensive mimicry of the hierarchical structures toughening mechanisms natural can be facilely fabricated via a bottom-up assembly process based on laminating pre-fabricated...
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...
High-fidelity experiments of Richtmyer–Meshkov instability on a single-mode air/ $\text{SF}_{6}$ interface are carried out at weak shock conditions. The soap-film technique is extended to create gaseous interfaces which free small-wavelength perturbations, diffusion layers and three-dimensionality. interfacial morphologies captured show that the evolution evidently involves smallest experimental uncertainty among all existing results. performances impulsive model other nonlinear models...
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,...
Shock-induced instability developments of two successive interfaces have attracted much attention, but remain a difficult problem to solve. The feedthrough and reverberating waves between significantly influence the hydrodynamic instabilities interfaces. evolutions slow/fast driven by weak shock wave are examined experimentally numerically. First, general one-dimensional theory is established describe movements studying rarefaction reflected Second, an analytical, linear model considering...
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...
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...
Abstract
The Richtmyer–Meshkov instability of heavy/light single-mode (SM), trapezoid (TR) and sawtooth (ST) interfaces is studied experimentally by considering the reshock. TR ST can be expanded into Fourier series with a dominant fundamental mode more high-order modes, recognized as quasi-single-mode ones. In experiments, distorted at time first reshock arrival develop in weakly nonlinear stage, ensuring an approximate single-scale function evolving interface. results show evident memory initial...
‘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....
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...