ANALYTICAL MODEL PREDICTING THE PENETRATION BEHAVIOUR OF A JET WITH A TIME-VARYING DENSITY PROFILE

机译：时变密度分布曲线的射流侵彻行为分析模型

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A penetration model based on the classic hydro-dynamic penetration equations is derived for jets with a linear time varying density profile. The resultant equations are used to generate penetration data for selected charge and target configurations. These data are compared to experimental crater bottom measurement data ions. by charges with powder metallurgy liners. Good correlation between modeling and experimental data was obtained for the cases under investigation.

机译：对于具有线性时变密度分布的射流，导出了基于经典流体动力渗透方程的渗透模型。所得方程用于生成选定装药和目标构型的渗透数据。将这些数据与实验坑底部测量数据离子进行比较。用粉末冶金衬里填充。对于正在调查的案例，建模与实验数据之间具有良好的相关性。

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来源
《21st International Symposium on Ballistics v.1》|2004年|P.390-395|共6页
会议地点 Adelaide(AU);Adelaide(AU)
作者
K D Werneyer; F J Mostert;
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TTP Products, PO Box 1400, Somerset-West, 7129, South Africa;

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原文格式 PDF
正文语种 eng
中图分类枪炮弹道学;
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4. ANALYTICAL MODEL PREDICTING THE PENETRATION BEHAVIOUR OF A JET WITH A TIME-VARYING DENSITY PROFILE [C] . K D Werneyer, F J Mostert International symposium on ballistics . 2004

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7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

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机译：在ICRF加热条件下预测JET中离子速度分布的分析模型。

ANALYTICAL MODEL PREDICTING THE PENETRATION BEHAVIOUR OF A JET WITH A TIME-VARYING DENSITY PROFILE

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