| 引用本文: | 刘世杰,林志勇,孙明波,等.采用不同化学反应源项处理方法的胞格爆轰数值研究.[J].国防科技大学学报,2010,32(5):1-6.[点击复制] |
| LIU Shijie,LIN Zhiyong,SUN Mingbo,et al.Numerical Simulation of Cellular Detonation Using Different Chemical Reacting Source Term Methods[J].Journal of National University of Defense Technology,2010,32(5):1-6[点击复制] |
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| 采用不同化学反应源项处理方法的胞格爆轰数值研究 |
| 刘世杰, 林志勇, 孙明波, 刘卫东 |
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(国防科技大学 航天与材料工程学院，湖南 长沙 410073)
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| 摘要: |
| 采用一种改进的化学非平衡流解耦方法对Euler反应流方程进行解耦处理，对流项采用五阶WENO格式进行离散，化学反应源项分别采用梯形公式和α-QSS拟稳态逼近两种方法处理，时间步进采用二阶精度的Runge-Kutta方法，对H2/O2/Ar预混气的胞格爆轰进行了二维数值模拟。两种处理方法都得到了合理的三波点结构，计算结果接近，但α-QSS拟稳态逼近处理方法的化学反应较完全，爆轰波传播速度较高；揭示了爆轰波结构的发展变化过程，横波与横波、横波与壁面碰撞引起的二次起爆对爆轰波的稳定发展至关重要；分析了数值胞格结构，胞格长宽比与参考文献基本一致，验证了本计算方法的有效性。 |
| 关键词: 胞格爆轰 解耦方法 梯形公式 α-QSS 拟稳态逼近方法 胞格结构 |
| DOI： |
| 投稿日期：2010-03-24 |
| 基金项目:国家自然科学基金资助项目(90816016) |
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| Numerical Simulation of Cellular Detonation Using Different Chemical Reacting Source Term Methods |
| LIU Shijie, LIN Zhiyong, SUN Mingbo, LIU Weidong |
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(College of Aerospace and Materials Engineering, National Univ. of Defense Technology， Changsha 410073, China)
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| Abstract: |
| An improved de-coupled solver of non-equilibrium flow was used to split the Euler equations for a reacting flow. Inviscid flux was calculated with fifth-order WENO scheme. Trapezoid formula and α-QSS methods were applied to deal with the stiffness generated by the chemical reacting source term of species equations separately. Time integration was performed with two-order TVD Runge-Kutta scheme. Cellular detonation of H2/O2/Ar in a straight tube was numerically studied. Calculated results by different methods were similar, and triple point structures were analyzed. The releasing heat of chemical reaction dealt with by α-QSSmethod is higher than that by trapezoid formula, so the detonation wave propagating speed of α-QSSmethod is higher than that of trapezoid formula too. Development of cellular structure was elaborated. Due to interactions between transverse waves and between transverse wave and tube wall, re-initiation was ignited, which plays a crucial role in the propagating of detonation wave. Ratio of numerical cellular structure length to width is consistent with reference value, which indicates the feasibility of the numerical method. |
| Keywords: cellular detonation uncoupled non-equilibrium method trapezoid formula α-QSS cellular structure |
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