| Numerical study on unstable surfaces of oblique detonations | |
| Teng, Hong Hui1; Jiang, Zong Lin1; Ng, Hoi Dick2; Teng, HH (reprint author),Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China | |
| 发表期刊 | JOURNAL OF FLUID MECHANICS
 |
| 2014-04-01 | |
| 卷号 | 744页码:111-128 |
| ISSN | 0022-1120 |
| 摘要 | In this study, the onset of cellular structure on oblique detonation surfaces is investigated numerically using a one-step irreversible Arrhenius reaction kinetic model. Two types of oblique detonations are observed from the simulations. One is weakly unstable characterized by the existence of a planar surface, and the other is strongly unstable characterized by the immediate formation of the cellular structure. It is found that a high degree of overdrive suppresses the formation of cellular structures as confirmed by the results of many previous studies. However, the present investigation demonstrates that cellular structures also appear with degree of overdrive of 2.06 and 2.37, values much higher than similar to 1.8 suggested previously in the literature for the critical value defining the instability boundary of oblique detonations. This contradiction could be explained by the use of differently shaped walls, a straight wall used in this study and a custom-designed curved wedge system so as to induce straight oblique detonations in previous studies. Another possible reason could be due to the low and possibly insufficient resolution used in previously published studies. Hence, simulations with different grid sizes are also performed to examine the effect of resolution on the numerical solutions. Using the present results, analysis also shows that although the characteristic lengths of unstable surfaces are different when the incident Mach number changes, these length scales are proportional to tangential velocities. Hence, the interior time determined by the overdrive degree is identified, and its limitation as the instability parameter is discussed.; In this study, the onset of cellular structure on oblique detonation surfaces is investigated numerically using a one-step irreversible Arrhenius reaction kinetic model. Two types of oblique detonations are observed from the simulations. One is weakly unstable characterized by the existence of a planar surface, and the other is strongly unstable characterized by the immediate formation of the cellular structure. It is found that a high degree of overdrive suppresses the formation of cellular structures as confirmed by the results of many previous studies. However, the present investigation demonstrates that cellular structures also appear with degree of overdrive of 2.06 and 2.37, values much higher than similar to 1.8 suggested previously in the literature for the critical value defining the instability boundary of oblique detonations. This contradiction could be explained by the use of differently shaped walls, a straight wall used in this study and a custom-designed curved wedge system so as to induce straight oblique detonations in previous studies. Another possible reason could be due to the low and possibly insufficient resolution used in previously published studies. Hence, simulations with different grid sizes are also performed to examine the effect of resolution on the numerical solutions. Using the present results, analysis also shows that although the characteristic lengths of unstable surfaces are different when the incident Mach number changes, these length scales are proportional to tangential velocities. Hence, the interior time determined by the overdrive degree is identified, and its limitation as the instability parameter is discussed. |
| 关键词 | Compressible Flows Detonation Waves |
| 学科领域 | Mechanics ; Physics |
| DOI | 10.1017/jfm.2014.78 |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000333188800008 |
| 关键词[WOS] | ONE-DIMENSIONAL DETONATIONS ; IDEALIZED DETONATIONS ; 2-DIMENSIONAL DETONATIONS ; NONLINEAR STABILITY ; SHOCK-WAVES ; SIMULATIONS ; ACCURACY ; WEDGE ; COMBUSTION ; RESOLUTION |
| WOS研究方向 | Mechanics ; Physics |
| WOS类目 | Mechanics ; Physics, Fluids & Plasmas |
| 项目资助者 | National Natural Science Foundation of China NSFC(11372333 ; Natural Sciences and Engineering Research Council of Canada (NSERC) ; 51376165 ; 11102216) |
| 课题组名称 | LHD激波与爆轰物理 |
| 论文分区 | 一类 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/48740 |
| 专题 | 高温气体动力学国家重点实验室 |
| 通讯作者 | Teng, HH (reprint author),Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China |
| 作者单位 | 1.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China 2.Concordia Univ, Dept Mech & Ind Engn, Montreal, PQ H3G 1M8, Canada |
| 推荐引用方式 GB/T 7714 | Teng, Hong Hui,Jiang, Zong Lin,Ng, Hoi Dick,et al. Numerical study on unstable surfaces of oblique detonations[J]. JOURNAL OF FLUID MECHANICS,2014,744:111-128. |
| APA | Teng, Hong Hui,Jiang, Zong Lin,Ng, Hoi Dick,&Teng, HH .(2014).Numerical study on unstable surfaces of oblique detonations.JOURNAL OF FLUID MECHANICS,744,111-128. |
| MLA | Teng, Hong Hui,et al."Numerical study on unstable surfaces of oblique detonations".JOURNAL OF FLUID MECHANICS 744(2014):111-128. |
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