Experiment on non-self-similar of Mach reflection of gaseous detonation wave
-
摘要: 为了研究在CJ(Chapman-Jouguet)状态下气相爆轰波马赫反射的非自相似性特征,搭建了由驱动段、传播段以及观测段组成的矩形管道;利用纹影和烟膜实验方法分别对3种预混气发生马赫反射现象进行了实验研究.实验结果表明:对稳态或非稳态气体,测量了马赫反射三波点位置高度,验证了马赫反射三波点轨迹线为波动的曲线,即自相似性对爆轰波马赫反射失效;非自相似性的重要特征是三波点轨迹线在楔角初始位置时基本遵循无反应冲击波理论计算结果,随后逐渐偏离并向有反应冲击波转变,之后接近平行于反应冲击波理论计算并稳定地处于两个理论值之间.最后给出在初始压力为10kPa和楔角为30°的条件下,对于所研究的3种气体,其马赫反射三波点发生转变的位置高度分别约为0.8,1.05cm以及0.5cm,可见相同初始条件下非稳态气体的马赫反射发生转变比稳态气体提前.Abstract: In order to study the non-self-similarity of Mach reflection of detonation waves, Mach reflection of detonation waves was investigated in a thin rectangular channel, and the schlieren system and smoked foils were used respectively to obtain experimental results about Mach reflection that happened in three kinds of pre-mixtures. The results illustrate that for stable or unstable mixtures, the triple point trajectory rendered by Mach reflection is a curve, which means that the Mach reflection of detonations waves along the wedge doesn't have the characteristic of self-similarity as that of the non-reactive shocks.A crucial feature about the non-self-similarity is found that the trajectory of Mach reflection in detonation waves roughly follows triple point trajectory of non-reactive shock theory at beginning of wedge, and then falls on a line parallel to triple point trajectory of reactive shock theory.When the initial pressure was 10kPa and the wedge angle was 30°, the height of Mach triple point of the pre-mixtures for the transition was 0.8, 1.05cm and 0.5cm respectively, which demonstrates that the transition of unstable mixture happens early than stable mixture.
-
Key words:
- gaseous detonation /
- Mach reflection /
- three-shock theory /
- non-self-similar /
- cellular structure
-
[1] Hornung H.Regular and Mach reflection of shock waves[J].Annual Review Fluid Mechanics,1986,18:33-58. [2] Ben-Dor G,Takayama K.The phenomena of shock wave reflection:a review of unsolved problems and future research needs[J].Shock Waves,1992,2(4):211-223. [3] Kobayashi S,Adachi T.Consideration of Von Neumann reflection and Mach reflection for strong shock waves[C]//Proceedings of 28th International Symposium on Shock Waves.Heidelberg,Berlin:Springer,2012:485-491. [4] Viero D P,Susin F M,Defina A.Anote on weak shock wave reflection[J].Shock Waves,2013,23(5):505-511. [5] Ben-Dor G.Shock wave reflection phenomena[M].New York:Springer-Verlag,2007. [6] Fickett W,Davis W C.Detonation:theory and experiment[M].Berkeley,California:University of California Press,1979. [7] Zhang F.Shock wave science and technology reference library:Vol.6[M].New York:Springer,2012. [8] Austin J M.Therole of instability in gaseous detonation[D].California:California Institute of Technology,2003. [9] Lee J H S.Detonation phenomenon[M].Livermore,CA:Cambridge University Press,2007. [10] 于勇,徐新文.拉瓦尔喷管外发生激波反射工况详细分析[J].航空动力学报,2012,27(9):1988-1996. YU Yong,XU Xinwen.Further detailed analysis about shock wave reflection outside Laval nozzle in different working states[J].Journal of Aerospace Power,2012,27(9):1988-1996.(in Chinese) [11] 王栋.脉冲爆震发动机工作过程数值模拟研究[D].南京:南京理工大学,2007. WANG Dong.Numerical simulation of pulse detonation engine cycle[D].Nanjing:Nanjing University of Science and Technology,2007.(in Chinese) [12] 孙晓辉,陈志华,薛大文,等.双楔面诱导的斜爆轰波阵面的磁流体控制[J].航空动力学报,2012,27(4):735-741. SUN Xiaohui,CHEN Zhihua,XUE Dawen,et al.MHD control of oblique detonation wave front induced by double wedges[J].Journal of Aerospace Power,2012,27(4):735-741.(in Chinese) [13] Meltzer J,Shepherd J E,Akbar R,et al.Mach reflection of detonation waves[J].Progress in Astronautics and Aeronautics,1991,153:78-94. [14] Akbar R.Mach reflection of gaseous detonations[D].Troy:Rensselaer Polytechnic Institute,1997. [15] Pintgen F,Eckett C A,Austin J M,et al.Direct observations of reaction zone structure in propagating detonations[J].Combustion and Flame,2003,133(3):211-229. [16] Trotsyuk A V.Numerical study of the reflection of detonation waves from a wedge[J].Combustion,Explosion,and Shock Waves,1999,35(6):690-697. [17] Shepherd J E,Schultz E,Akbar R.Detonation diffraction[C]//Proceedings of 22nd International Symposium on Shock Waves.London:Southampton University Media,2000:41-48. [18] Hu Z M,Jiang Z L.Wave dynamic processes in cellular detonation reflection from wedges[J].Acta Mechanica Sinica,2007,23(1):33-41. [19] Lee J H S.Dynamic parameters of gaseous detonations[J]. Annual Review of Fluid Mechanics,1984,16:311-336. [20] Gordon S,McBride B J.Computer program for calculation of complex chemical equilibrium compositions and application[R].Washington,DC:NASA,Reference Publication 1311,1994. [21] 杨旸,姜宗林,胡宗民.激波反射现象的研究进展[J].力学进展,2012,42(2):141-161. YANG Yang,JIANG Zonglin,HU Zongmin.Advances in shock wave reflection on phenomena[J].Advances in Mechanics,2012,42(2):141-161.(in Chinese) [22] Li H,Ben-Dor G,Grönig H.Analytical study of the oblique reflection of detonation waves[J].AIAA Journal,1997,35(11):1712-1720. [23] Takayama K,Ben-Dor G.State-of-the-art in research on Mach reflection of shock waves[J].Sandhana,1993,18(3):695-710. [24] Desbordes D,Guerraud C,Hamada L,et al.Failure of the classical dynamic parameters relationships in highly regular cellular detonation systems[J].Progress in Astronaut and Aeronaut,1993,153:347-359. [25] Eckett C A,Quirk J J,Shepherd J E.The role of unsteadiness in direct initiation of gaseous detonation[J].Fluid Mechanics,2000,421:147-183.
点击查看大图
计量
- 文章访问数: 1051
- HTML浏览量: 9
- PDF量: 453
- 被引次数: 0