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| 1 | Detonation initiation developing from the Richtmyer-Meshkov instability显示文摘爆炸开始源于 Richtmyer Meshkov 不稳定性在 combustive 气体混合物在 shock/spark-induced-deflagration 相互作用的配置数字地被调查。二维的多种类 Navier 司烧与详细化学反应模型一起实现的方程与控制分散的消散的计划被解决。数字结果证明火花能创造一个强风波浪并且点燃 deflagrations。然后,爆燃波浪由于 Richtmyer Meshkov 不稳定性被提高,它向爆炸开始提供本地环境条件。由检验爆燃前面,二种开始机制被识别。一个人在弱冲击波的帮助下被叫作爆燃前面加速,发生在凸的表面上,并且其它是源于集中的爆燃前面的热点爆炸,发生在凹面表面上。 | H.H.Teng Z.L.Jiang Z.M.Hu LHD.Institute of Mechanics,CAS.Beijing 100080,China | 2007 | Acta Mechanica Sinica2007，23，4： | 4 |
| 2 | Spectral measurements of hypervelocity flow in an expansion tunnel显示文摘Atmospheric reentry vehicles and planetary probes fly through the atmosphere at hypervelocity speed. At such speed, there is a significant proportion of heat load to the vehicle surface due to radiative heating. Accurate prediction needs a good knowledge of the radiation spectrum properties. In this paper, a high-speed camera and spectrograph coupled to an intensified charge-coupled device have bee n impleme nted to inv estigate the rad i at io n flow over a semi-cylinder model. The experiments were carried out in the JF16 expansi on timnel with secondary shock velocity of 7.9 km·s^-1. Results show that the emissio n spectrum comprises several atomic lines and molecular band systems. We give detailed data of the radiation spectrum, shock shape, shock detached distance and radiation intensity varying with space and wavelength. This valuable experimental dataset will be helpful to validate computational fluid dynamics codes and radiation models, which equates to increased prediction accuracy of radiation heating. Also, some suggestions for spectral measurement in hypervelocity flow field were list in the end. | C.K.Yuan K.Zhou Y.F.Liu Z.M.Hu Z.L.Jiang | 2019 | Acta Mechanica Sinica2019，35，1： | 2 |
| 3 | Simulation of Wave-Flow-Cavitation Interaction Using a Compressible Homogenous Flow Method显示文摘A numerical method based on a homogeneous single-phase flow model is presented to simulate the interaction between pressure wave and flow cavitation.To account for compressibility effects of liquid water,cavitating flow is assumed to be compressible and governed by time-dependent Euler equations with proper equation of state(EOS).The isentropic one-fluid formulation is employed to model the cavitation inception and evolution,while pure liquid phase is modeled by Tait equation of state.Because of large stiffness of Tait EOS and great variation of sound speed in flow field,some of conventional compressible gasdynamics solvers are unstable and even not applicable when extended to calculation of flow cavitation.To overcome the difficulties,a Godunov-type,cell-centered finite volume method is generalized to numerically integrate the governing equations on triangular mesh.The boundary is treated specially to ensure stability of the approach.The method proves to be stable,robust,accurate,time-efficient and oscillation-free.Novel numerical experiments are designed to investigate unsteady dynamics of the cavitating flow impacted by pressure wave,which is of great interest in engineering applications but has not been studied systematically so far.Numerical simulation indicates that cavity over cylinder can be induced to collapse if the object is accelerated suddenly and extremely high pressure pulse results almost instantaneously.This,however,may be avoided by changing the traveling speed smoothly.The accompanying huge pressure increasemay damage underwater devices.However,cavity formed at relatively high upstream speed may be less distorted or affected by shock wave and can recover fully from the initial deformation.It is observed that the cavitating flow starting from a higher freestream velocity is more stable and more resilient with respect to perturbation than the flow with lower background speed.These findings may shed some light on how to control cavitation development to avoid possible damage to operating devices. | J.G.Zheng B.C.Khoo Z.M.Hu | 2013 | Communications in Computational Physics2013，14，7： | 1 |
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