干旱区生态环境知识资源中心(Arid): 碳基材料氧化烧蚀的快/慢反应动力学问题

Arid

	碳基材料氧化烧蚀的快/慢反应动力学问题
其他题名	Study on fast/slow reaction mechanism of carbon-based material oxidation in high speed stream of dissociated air
	国义军 1; 周述光 2; 曾磊 2; 刘骁 2; 代光月 2; 邱波 2
来源期刊	实验流体力学
ISSN	1672-9897
出版年	2019
卷号	33 期号:2 页码:17-22,101
中文摘要	在前期单/双平台问题研究的基础上[1],就学术上和工程应用中关注的碳在空气中燃烧的快反应和慢反应问题进行了深入分析,研究发现被广泛使用50余年的慢反应并不存在,而被弃置的快反应则真实存在,且具有重要的应用价值。采用快反应动力学数据,同时考虑CO、CO_2两个烧蚀产物,得到的无量纲烧蚀速率随温度的变化曲线存在两个平台,其中,温度稍低情况下出现的第一平台对应的主要烧蚀产物为CO_2,温度稍高情况下出现的第二平台对应的主要烧蚀产物为CO,且第一平台对应的无量纲烧蚀速率恰好是第二平台的1/2。过去常被忽略的CO_2扮演了重要角色,由它产生的第一平台,将以往文献中看似完全独立、毫无关系的快反应和慢反应曲线建立了联系。理论分析表明:第一平台之前的快速上升段属于从速率控制区到扩散控制区的过渡区,第一平台及其以后的区域都属于扩散控制区(包括两个平台之间的连接线),它是由反应生成物CO与CO_2的分压比delta从0到的变化引起的,与表面化学反应动力学条件完全无关。由双平台理论得到的从低温到高温、由速率控制区经由过渡区到达扩散控制区的整条烧蚀速率曲线,与实验结果完全吻合。
英文摘要	Based upon our previous research on the single/dual platforms theory for carbonbased material oxidation,it has been found that the generally accepted slowreaction model which was presented by Scala in 1962 and has been widely used till now for over fifty years does not exist,while the deserted fastreaction model really exists and is of great value in application.Theoretical analysis shows that theslowreaction appears only at the boundarylayer- diffusion-rate controlled regime,In this regime,the ablation rate has no business with the chemical reaction rates,so it is a fictitious reaction model and has no physical meanings,although the results from it may be in agreement well with test results.The products of the heterogeneous reactions of carbon with oxygen are CO and CO_2,but CO_2 is usually neglected when the surface temperature is higher than 1000Kin many literatures.However,from theoretical analysis, author find that CO_2 plays an important role in spanning the reaction range from the reaction-rate controlled regime to the diffusion controlled oxidation regime,and can’t be ignored.It has been shown that for the ablation of carbon-based materials in a high speed stream of dissociated air, thefastreaction must be used with both products of CO_2 and CO at the same time.There are two different platforms in the diffusion controlled regime.The first platform results from reactions of the predominant CO_2 product,and the other is due to the predominant CO product reactions.With the increases of the surface temperature,the ratio of the mass fraction of CO to CO_2 at the surface rises rapidly from zero to infinity,which causes the oxidation process to change automatically from the nominatedfastreaction to the so calledslowreaction lines. The dual platform theory has been confirmed by several experimental results.
中文关键词	碳基材料 ; 烧蚀 ; 反应动力学 ; 边界层扩散 ; 双平台理论
英文关键词	carbon base materials ablation model oxidation reaction-diffusion controlled dual platforms theory
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENGINEERING MECHANICAL
WOS研究方向	Engineering
CSCD记录号	CSCD:6497782
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/239501
作者单位	1.中国空气动力研究与发展中心计算空气动力研究所;;空气动力学国家重点实验室, ;;空气动力学国家重点实验室, 绵阳;;绵阳, 四川;;四川 621000;;621000, 中国; 2.中国空气动力研究与发展中心计算空气动力研究所, 绵阳, 四川 621000, 中国
推荐引用方式 GB/T 7714	国义军,周述光,曾磊,等. 碳基材料氧化烧蚀的快/慢反应动力学问题[J],2019,33(2):17-22,101.
APA	国义军,周述光,曾磊,刘骁,代光月,&邱波.(2019).碳基材料氧化烧蚀的快/慢反应动力学问题.实验流体力学,33(2),17-22,101.
MLA	国义军,et al."碳基材料氧化烧蚀的快/慢反应动力学问题".实验流体力学 33.2(2019):17-22,101.