反射激波构型在反应空气非平衡模型验证中的应用

IF 1.1 4区 工程技术 Q4 ENGINEERING, MECHANICAL
S. Gimelshein, Jesse W. Streicher, Ajay Krish, R. Hanson, I. Wysong
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引用次数: 0

摘要

在重现早期冲击管实验的条件下,使用直接模拟蒙特卡罗(DSMC)方法对氧-氩和空气混合物中反射冲击波背后的瞬态热弛豫和化学弛豫进行建模。测试了两个振动-平移和三个流行的DSMC化学反应模型。在可能的情况下,调整模型参数以匹配平衡和非平衡[公式:见正文]弛豫时间和反应速率。研究了影响弛豫和反应模型验证的许多因素,包括气体-表面相互作用、时变自由流特性、观察点的位置、电子激发和实验中探测的振动态的非平衡布居。数值和实验结果的比较表明,反射激波形态是一个非常方便验证和分析高温化学反应模型的平台。计算表明,Bias反应模型优于总碰撞能和量子动力学模型,与氧-氩混合物和纯[公式:见正文]中测得的吸收时间历程和[公式:参见正文]振动温度具有合理的一致性。在空气中观察到的建模与实验之间存在一些差异,这可能需要对Zeldovich反应速率、氧-氮振动激发和非平衡离解速率进行额外的研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Application of Reflected Shock Wave Configuration to Validate Nonequilibrium Models of Reacting Air
The direct simulation Monte Carlo (DSMC) method is used to model transient thermal and chemical relaxation behind reflected shock waves in oxygen–argon and air mixtures under conditions reproducing earlier shock-tube experiments. Two vibration–translation and three popular DSMC chemical reaction models are tested. Where possible, model parameters are adjusted to match equilibrium and nonequilibrium [Formula: see text] relaxation times and reaction rates. A number of factors that impact relaxation and reaction model validation are examined, including gas–surface interactions, time-varying freestream properties, location of the observation point, electronic excitation, and nonequilibrium populations of vibrational states probed in the experiments. Comparison of numerical and experimental results has demonstrated that the reflected shock configuration is a platform very convenient for validation and analysis of high-temperature chemical reaction models. Computations have shown that the Bias reaction model is superior to the total collision energy and quantum kinetic models, providing reasonable agreement with measured absorbance time histories and [Formula: see text] vibrational temperatures in oxygen–argon mixtures and pure [Formula: see text]. There are some modeling-versus-experiment differences observed for air that may warrant additional studies focused on Zeldovich reaction rates and oxygen–nitrogen vibrational excitation and nonequilibrium dissociation rate.
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来源期刊
Journal of Thermophysics and Heat Transfer
Journal of Thermophysics and Heat Transfer 工程技术-工程:机械
CiteScore
3.50
自引率
19.00%
发文量
95
审稿时长
3 months
期刊介绍: This Journal is devoted to the advancement of the science and technology of thermophysics and heat transfer through the dissemination of original research papers disclosing new technical knowledge and exploratory developments and applications based on new knowledge. The Journal publishes qualified papers that deal with the properties and mechanisms involved in thermal energy transfer and storage in gases, liquids, and solids or combinations thereof. These studies include aerothermodynamics; conductive, convective, radiative, and multiphase modes of heat transfer; micro- and nano-scale heat transfer; nonintrusive diagnostics; numerical and experimental techniques; plasma excitation and flow interactions; thermal systems; and thermophysical properties. Papers that review recent research developments in any of the prior topics are also solicited.
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