A simple reactive gasdynamic model for the computation of gas temperature and species concentrations behind reflected shock waves
A simple reactive gasdynamic model for the computation of gas temperature and species concentrations behind reflected shock waves
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DOI：
10.1002/kin.20305
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发表时间：
2008-04
影响因子：
1.5
通讯作者：
H. Li;Z. Owens;D. Davidson;R. Hanson
中科院分区：
文献类型：
--
作者：
H. Li;Z. Owens;D. Davidson;R. Hanson
一个简单的气体动力学模型，称为CHEMSHOCK，已被开发来预测燃烧气体的温度和物质浓度的时间演变背后的反射冲击波具有显着的能量释放。CHEMSHOCK提供了一种方便的模拟方法来研究各种尺寸的燃烧机制在广泛的条件。该模型由两个连续的子操作，在每个无穷小的时间步长期间执行的控制质量：（1）首先，气体混合物被允许在恒定的内部能量和体积燃烧;（2）然后气体在冻结的组合物等熵膨胀（或压缩）到测量的压力。CHEMSHOCK模型首先验证从一维反应计算流体动力学（CFD）代码的庚烷/O2/Ar混合物的代表性情况下，使用简化机制的结果。CHEMSHOCK被发现可以准确地再现CFD计算的结果，并显著减少计算时间。然后将CHEMSHOCK模拟结果与实验结果进行了比较，获得了气体温度和水蒸气浓度，使用一种新型的激光传感器，基于固定波长的吸收的两个H2O振转跃迁近1.4 μm。CHEMSHOCK模拟和冲击波测试进展中的测量结果之间存在很好的一致性：（1）在H2O/Ar中，没有能量释放;（2）在H2/O2/Ar中，能量释放相对较小;（3）在庚烷/O2/Ar中，能量释放较大。© 2008 Wiley Periodicals，Inc. Int J Chem Kinet 40：189-198，2008
A simple gasdynamic model, called CHEMSHOCK, has been developed to predict the temporal evolution of combustion gas temperature and species concentrations behind reflected shock waves with significant energy release. CHEMSHOCK provides a convenient simulation method to study various sized combustion mechanisms over a wide range of conditions. The model consists of two successive suboperations that are performed on a control mass during each infinitesimal time step: (1) first the gas mixture is allowed to combust at constant internal energy and volume; (2) then the gas is isentropically expanded (or compressed) at frozen composition to the measured pressure. The CHEMSHOCK model is first validated against results from a one-dimensional reacting computational fluid dynamics (CFD) code for a representative case of heptane/O2/Ar mixture using a reduced mechanism. CHEMSHOCK is found to accurately reproduce the results of the CFD calculation with significantly reduced computational time. The CHEMSHOCK simulation results are then compared to experimental results, for gas temperature and water vapor concentration, obtained using a novel laser sensor based on fixed-wavelength absorption of two H2O rovibrational transitions near 1.4 μm. Excellent agreement is found between CHEMSHOCK simulations and measurements in a progression of shock wave tests: (1) in H2O/Ar, with no energy release; (2) in H2/O2/Ar, with relatively small energy release; and (3) in heptane/O2/Ar, with large energy release. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 189–198, 2008