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您的检索式：作者名="Zhigong TANG"
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| 1 | Homogeneous arc ablation behaviors of CuCr cathodes improved by chromic oxide显示文摘Cathode ablation is one of the dominant limitations for extending the maximum operating time of arc heaters.In this work,the arc ablation behaviors and mechanisms of commercial CuCr10,CuCr25,and CuCr50 cathodes were investigated for pure copper and pure chromium cathodes.The discharging homogeneity was improved with the increase of chromium content in the cathodes,which was attributed to the formed chromic oxide layer.The CuCr50 cathodes exhibited the lowest ablation rate with a reduction of 27.0%compared to the copper cathodes.The chromic oxide formed in the pit protected the bottom matrix,leading to a homogeneous ablation process.The mechanism for the improved homogeneous ablation behaviors of the CuCr50 cathodes was proposed and featured by the suppression of deep pits and the dispersion of arc foot.Future attention will be focused on designing composite cathodes with an anti-ablation surface layer and a good conductive matrix. | Weimian Guan Jie Yuan Hao Lv Tao Zhu Youtong Fang Jiabin Liu Hongtao Wang Zhihui Li Zhigong Tang Wei Yang | 2021 | Journal of Materials Science & Technology2021，，22： | 3 |
| 2 | Competing effects of surface catalysis and ablation in hypersonic reentry aerothermodynamic environment显示文摘Under hypersonic flow conditions, the complicated gas-graphene interactions including surface catalysis and surface ablation would occur concurrently and intervene together with the thermodynamic response induced by spacecraft reentry. In this work, the competing effects of surface heterogeneous catalytic recombination and ablation characteristics at elevated temperatures are investigated using the Reactive Molecular Dynamics(RMD) simulation method. A GasSurface Interaction(GSI) model is established to simulate the collisions of hyper-enthalpy atomic oxygen on graphene films in the temperature range of 500–2500 K. A critical temperature Tcaround900 K is identified to distinguish the graphene responses into two parts: at T < T_(c), the heterogeneous surface catalysis dominates, while the surface ablation plays a leading role at T > T_(c). Contradicting to the traditional Arrhenius expression that the recombination coefficient increases with the increase of surface temperature, the value is found to be relatively uniform at T < T_(c) but declines sharply as the surface temperature increases further due to the competing ablation effect. The occurrence of surface ablation decreases the amounts of active sites on the graphene surface for oxygen adsorption, leading to reduced recombination coefficient from both Langmuir-Hinshelwood(L-H) and Eley-Rideal(E-R) mechanisms. It suggests that the traditional Computational Fluid Dynamics(CFD) simulation method, which relies on the Arrhenius-type catalysis model, would result in large discrepancies in predicting aerodynamic heat for carbon-based materials during reentry into strong aerodynamic thermal environment. | Zhiliang CUI Jin ZHAO Guice YAO Jun ZHANG Zhihui LI Zhigong TANG Dongsheng WEN | 2022 | Chinese Journal of Aeronautics2022，35，10： | 2 |
| 3 | Low phase noise millimeter wave monolithic integrated phase locked-loop显示文摘 | Tang Lu Wang Zhigong Qiu Yinghua Xu Jian | 2012 | High Technology Letters2012，18，3： | 0 |
| 4 | Predicting near-wall turbulence with minimal flow units in compressible turbulent channel flows显示文摘Mach number effects on the near-wall turbulence in the absence of outer motions remain unclear so far.The present study extends the Minimal Flow Units(MFUs),a widely applied method to investigate near-wall turbulence free from the impact of large-scale motions in the outer region in incompressible channel flows,to compressible wall-bounded turbulence.The compressible near-wall turbulence in MFU proves accurate in replicating near-wall statistics,independent of Mach number and statistically equivalent to the universal signals extracted from the full-sized channel.It is further utilized as universal signals in the predictive models of compressible near-wall turbulence,which is capable of accurately predicting variances and joint probability density functions of velocity and temperature fluctuations. | Ming YU Yalu FU Zhigong TANG Xianxu YUAN Chunxiao XU | 2023 | Chinese Journal of Aeronautics2023，36，8： | 0 |
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