| 热化学非平衡流动的DSMC-ME算法研究 |
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| 引用本文： | 叶品,钟诚文.热化学非平衡流动的DSMC-ME算法研究[J].计算物理,2008,25(2):139-144. |
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| 作者姓名： | 叶品 钟诚文 |
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| 作者单位： | 1. 西北工业大学 翼型、叶栅空气动力学国防科技重点实验室, 陕西 西安 710072;2. 中国空空导弹研究院总体部, 河南 洛阳 471009 |
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| 摘 要： | 将最大熵方法(Maximum Entropy,缩写为ME)引入Direct Simulation Monte Carlo(DSMC)模拟热化学非平衡流动过程中,构造一个计算非平衡条件下化学反应几率和反应碰撞能量分配的最大熵模型.在DSMC-ME的模拟过程中,对分子间的非反应碰撞,采用传统的Larsen-Borgnakke唯象论模型模拟碰撞分子内能的激发与松弛;对分子间反应碰撞,采用最大熵模型模拟分子间的化学反应和能量交换.通过模拟高空高超声速绕圆柱和低密度高焓绕钝头锥体流动,并与DSMC算法和HEG实验结果比较,论证了DSMC-ME算法的有效性.
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| 关 键 词： | 最大熵(ME) DSMC 非平衡 化学反应 |
| 收稿时间： | 2006-10-10 |
| 修稿时间： | 2007-04-09 |
DSMC-ME Method for Thermo-chemical Non-equilibrium Gas Flows |
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| YE Pin,ZHONG Chengwen.DSMC-ME Method for Thermo-chemical Non-equilibrium Gas Flows[J].Chinese Journal of Computational Physics,2008,25(2):139-144. |
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| Authors: | YE Pin ZHONG Chengwen |
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| Institution: | 1. National Key Laboratory of Aerodynamics Design and Research, Northwestern Polytechnical University, Xi′an 710072, China;2. China Airborne Missile Academy, Luoyang 471009, China |
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| Abstract: | For the simulation of thermochemical non-equilibrium gas flows by direct simulation Monte Carlo(DSMC),a model based on maximum entropy(ME) is developed to calculate reaction probability and post reaction energy disposal. For non-reacting collisions,a generalized Larsen-Borgnakke method is employed for energy exchange.For reacting collisions,ME method is employed for energy exchange and chemical reaction. Hypersonic gas flow around a cylinder in high altitude and gas flow around a blunted cone of low density and high entropy are simulated and compared with results of DSMC method and HEG wind-tunnel data.The DSMC-ME is demonstrated reliable. |
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| Keywords: | maximum entropy(ME) direct simulation Monte Carlo non-equilibrium chemical reaction |
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