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挥分(水、乙醇和乙醚)是单基火药(相对于双基药和多基药,只有硝化棉一种能量成分)的重要组成部分,其含量的多少不仅决定弹药弹道性能的优劣,而且对弹药结构的稳定性和贮存安全性都有重要的影响.本试验用干燥过的丁酮-仲丁醇混合溶剂萃取单基火药试样中的挥分,按标准单基火药挥分各组分的含量配制标准溶液,取标准溶液和萃取液进行色谱法测定,用峰高外标法可以直接计算出单基火药试样中挥分的含量. 相似文献
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A new transition prediction model is introduced,which couples the intermittency effect into the turbulence transport equations and takes the characteristics of fluid transition into consideration to mimic the exact process of transition.Test cases include a two-dimensional incompressible plate and a two-dimensional NACA0012 airfoil.Performance of this transition model for incompressible flows is studied,with numerical results consistent to experimental data.The requirement of grid resolution for this transition model is also studied. 相似文献
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