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等冲量条件下波长对坑道震塌影响的数值模拟分析
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作者 周泽鑫 张翼超 +2 位作者 周孝锋 郭威 迟本亮 《中国矿业》 北大核心 2019年第11期147-151,共5页
爆炸地冲击作用下坑道的震塌破坏是一个极其复杂的动力过程问题,在已有的研究中,均未涉及等冲量条件下波长与洞室跨度比对洞室震塌破坏的影响。本文运用数值模拟的方法对等冲量条件下不同波长的地冲击荷载对坑道的震塌影响进行了分析。... 爆炸地冲击作用下坑道的震塌破坏是一个极其复杂的动力过程问题,在已有的研究中,均未涉及等冲量条件下波长与洞室跨度比对洞室震塌破坏的影响。本文运用数值模拟的方法对等冲量条件下不同波长的地冲击荷载对坑道的震塌影响进行了分析。计算了五种不同波长与洞室跨度比条件下结构的动力响应,研究了结构中关键节点速度时程变化特征以及整体塑性应变情况,分析了五种条件下震塌区域面积和动能的变化规律。研究结果表明,地冲击波长对洞室震塌破坏形态影响较大,不同波长与洞室跨度比时洞室的震塌位置不同,在地冲击荷载的冲量值一定时,随着波长与洞室半径比值的增大,震塌区面积随之减小,震塌区动能也总体上相应减小。 展开更多
关键词 坑道 震塌破坏 等冲量 波长 数值模拟
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Non-Thermal Plasma Assisted Reforming of Ethanol in Dynamic Plasma-Liquid Systems
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作者 V. Chemyak S. Olszewskii +9 位作者 O. Nedybalyuk S. Sydoruk V. Yukhymenko I. Prysiazhnevych E. Martysh A. Shchedrin D. Levko V. Naumov V. Demchina V. Kudryavzev 《Journal of Energy and Power Engineering》 2011年第5期403-410,共8页
The paper presents experimental and theoretical studies of non-thermal plasma assisted reforming of liquid ethanol into hydrogen-rich syngas in dynamic plasma-liquid systems (PLS) using electric DC and pulsed discha... The paper presents experimental and theoretical studies of non-thermal plasma assisted reforming of liquid ethanol into hydrogen-rich syngas in dynamic plasma-liquid systems (PLS) using electric DC and pulsed discharges in a gas channel with liquid wall (DGCLW) and DC discharge in a reverse vortex gas flow of Tornado type with "liquid" electrode (TORNADO-LE). Results of experiments show the energy efficiency of plasma-chemical conversion of ethanol in studied systems. Results of model calculations explain the kinetic mechanism of non-equilibrium plasma-chemical transformations in different conditions. The proposed technique of plasma-fuel reforming can be used in alternative biofuels combustion technologies in advanced diesel engines and power plants. 展开更多
关键词 Energy conversion HYDROGEN ETHANOL electric discharge PLASMA fuel reforming.
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Nonexistence of a Globally Stable Supersonic Conic Shock Wave for the Steady Supersonic Isothermal Euler Flow
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作者 Yuchen LI Gang XU 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2013年第4期557-574,共18页
In this paper, for the full Euler system of the isothermal gas, we show that a globally stable supersonic conic shock wave solution does not exist when a uniform supersonic incoming flow hits an infinitely long and cu... In this paper, for the full Euler system of the isothermal gas, we show that a globally stable supersonic conic shock wave solution does not exist when a uniform supersonic incoming flow hits an infinitely long and curved sharp conic body. 展开更多
关键词 Supersonic flow Conic shock Full Euler system Isothermal gas NONEXISTENCE
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