Analytical Model for the Impulse of Single-Cycle Pulse Detonation Tube
Analytical Model for the Impulse of Single-Cycle Pulse Detonation Tube
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DOI：
10.2514/2.6099
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发表时间：
2003
影响因子：
1.9
通讯作者：
E. Wintenberger;J. Austin;M. Cooper;S. Jackson;J. Shepherd
中科院分区：
文献类型：
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作者：
E. Wintenberger;J. Austin;M. Cooper;S. Jackson;J. Shepherd
建立了单周脉冲爆轰管冲量的解析模型，并用实验数据进行了验证。该模型是基于爆震管推力面的压力历史建立的。压力历史由恒定压力部分模拟，紧随其后的是由于气体从管内膨胀而产生的衰变。定压部分的持续时间和幅度是通过分析管内稳定运动的爆轰波后自相似流动的气体动力学来确定的。采用量纲分析和经验观测相结合的方法模拟了气体膨胀过程。根据单位体积冲量、比冲量和推力，模型预测与直接实验测量结果进行了对比验证。并与基于数值模拟的比冲估计值进行了比较。对不同初始压力、当量比和氮气稀释度的燃料-氧气-氮气混合物(包括航空燃料)进行了单位体积冲量和比冲量的计算。此外，还研究了初始温度的影响。用一个简单的标度分析解释了观察到的趋势，表明了冲量对初始条件和混合物中能量释放的依赖关系。
An analytical model for the impulse of a single-cycle pulse detonation tube has been developed and validated against experimental data. The model is based on the pressure history at the thrust surface of the detonation tube. The pressure history is modeled by a constant pressure portion, followed by a decay due to gas expansion out of the tube. The duration and amplitude of the constant pressure portion is determined by analyzing the gasdynamics of the self-similar flow behind a steadily moving detonation wave within the tube. The gas expansion process is modeled using dimensional analysis and empirical observations. The model predictions are validated against direct experimental measurements in terms of impulse per unit volume, specific impulse, and thrust. Comparisons are given with estimates of the specific impulse based on numerical simulations. Impulse per unit volume and specific impulse calculations are carried out for a wide range of fuel–oxygen–nitrogen mixtures (including aviation fuels) of varying initial pressure, equivalence ratio, and nitrogen dilution. The effect of the initial temperature is also investigated. The trends observed are explained using a simple scaling analysis showing the dependency of the impulse on initial conditions and energy release in the mixture.