Porous propellant burning rate enhanced by plasma
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摘要: 利用密闭爆发器实验系统进行了等离子体增强4/7高固体发射药燃速特性的实验研究。采用等离子体发生器的电能利用效率来表征密闭爆发器内输入的等离子体能量，拟合了考虑压力梯度影响和电功率增强的固体发射药瞬态燃速公式。根据实验数据得到4/7高固体发射药的电功率燃速增强因子为0.005 MW-1。与Woodley燃速公式相比，瞬态燃速公式与实验压力曲线符合程度更高，能够更精确地描述固体发射药在等离子体作用下的燃烧过程。Abstract: The experimental system with a closed bomb was employed to discuss the characteristics of 4/7 high-nitrogen solid propellant burning rate enhanced by plasma. The plasma energy transferred into the closed bomb was measured by the utilization efficiency of the plasma generator electrical energy. A transient burning rate formula of propellant including the influence of pressure gradient and an enhanced gas generation rates coefficient by electrical power was presented. The enhanced gas generation rates coefficient of 4/7 high-nitrogen solid propellant is equal to 0.005 MW-1. Compared with the burning rate formula given by Woodley, the pressure curve simulated by the transient burning rate formula is in better agreement with the tests. And the transient burning rate formula can describe the combustion process of solid propellant by plasma more accurately.
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图 1 等离子体点火密闭爆发器实验装置结构示意图
Figure 1. Experimental setup of closed bomb with plasma igniter
图 4 常规点火时实验与数值模拟压力曲线
Figure 4. Experimental and simulated pressure-time curvesafter conventional ignition
图 5 第3发实验的压力与输入电功率曲线
Figure 5. Pressure-time and electric power-time curves for test 3
图 6 第4发实验的压力与输入电功率曲线
Figure 6. Pressure-time and electric power-time curves for test 4
图 7 第5发实验的压力与输入电功率曲线
Figure 7. Pressure-time and electric power-time curves for test 5
表 1 实验参数和结果
Table 1. Experimental parameters and results
编号 点火方式 Uc/kV tig/ms tend/ms pm/MPa 实验1 2号电点火 1.604 5.05 298 实验2 2号电点火 1.673 4.95 300 实验3 等离子体点火 8.3 0.261 2.93 318 实验4 等离子体点火 10.0 0.197 2.44 319 实验5 等离子体点火 10.1 0.167 2.16 329 
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表 2 模拟压力曲线与实验压力曲线间的均方误差
Table 2. Mean squared errors between simulated pressure curves and test ones
编号 σ/MPa Woodley燃速公式 瞬态燃速公式 实验3 4.325 4.294 实验4 9.312 4.910 实验5 13.506 5.715
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