U型方管中爆燃向爆震转变特性实验研究
收稿日期: 2014-06-05
修回日期: 2014-08-01
网络出版日期: 2014-11-02
基金资助
国家自然科学基金 (50906072, 51306154); 中央高校基本科研业务费专项资金 (3102014JCY01003)
Experimental investigation on characteristics of deflagration to detonation transition in U-bend square tube
Received date: 2014-06-05
Revised date: 2014-08-01
Online published: 2014-11-02
Supported by
National Natural Science Foundation of China (50906072, 51306154); The Fundamental Research Funds for the Central Universities (3102014JCY01003)
以脉冲爆震发动机(PDE)用曲管爆震燃烧室为应用背景,对气相(乙烯/空气)燃烧波在U型方管实验器中的传播过程进行了实验研究。通过改变实验器中弯曲段进口气流入射激波强度,基于弯曲段内压力、波速的测量及高速摄影实验得到了U型方管实验器中半圆型弯段内的爆燃向爆震转变(DDT)特性。结果表明,弯曲段中DDT特性受到入射激波速度的影响:当入射激波速度小于794 m/s (43.6%VCJ,VCJ为理论Chapman-Jouguet爆震波速),在弯曲段内不能形成爆震;当入射激波速度介于870~908 m/s (47.8%VCJ~50.0%VCJ)之间,弯曲段内首先会产生局部爆炸,并最终形成爆震;当入射激波速度大于934 m/s (51.3%VCJ),爆燃波可以直接在弯曲段入口转化为爆震波。
邱华 , 王玮 , 范玮 , 熊姹 . U型方管中爆燃向爆震转变特性实验研究[J]. 航空学报, 2015 , 36(6) : 1788 -1794 . DOI: 10.7527/S1000-6893.2014.0269
For the application of the curved detonation combustor in pulse detonation engine (PDE), in this paper we present the results of experimental investigation on gaseous combustion wave of C2H4/Air mixture propagation through a U-bend square tube. By changing the incident shock wave speed at the entrance of the bend section in U-bend square tube, the characteristics of deflagration to detonation transition (DDT) in bend section have been researched based on the pressures/velocities measure and high speed photography. When the incident shock wave speed is lower than 794 m/s(43.6%VCJ), the detonation cannot form in the bend section; when the speed is between 870 m/s and 908 m/s(47.8%VCJ-50.0%VCJ), the hot spot will be formed firstly and then the detonation will form finally in the bend section; when the speed exceeds 934 m/s(51.3%VCJ), the deflagration wave will directly transit into a detonation at the entrance of bend section.
[1] Fan W, Yan C J, Huang X Q, et al. Experimental investigation on two-phase pulse detonation engine[J]. Combustion and Flame, 2003, 133(4): 441-450.
[2] Roy G D, Frolov S M, Borisov A A, et al. Pulse detonation propulsion: challenges, current status, and future perspective[J]. Progress in Energy and Combustion Science, 2004, 30(6): 545-672.
[3] Helfrich T M, Schauer F R. Ignition and detonation-initiation characteristics of hydrogen and hydrocarbon fuels in a PDE[C]//45th AIAA Aerospace Sciences Meeting and Exhibit. Reston: AIAA, 2007.
[4] Austin J M, Shepherd J E. Detonations in hydrocarbon fuel blends[J]. Combustion and Flame, 2003, 132(1-2): 73-90.
[5] Brophy C M, Hanson R K. Fuel distribution effects on pulse detonation engine operation and performance[J]. Journal of Propulsion and Power, 2006, 22(6): 1155-1161.
[6] Wang W, Qiu H, Fan W, et al. Experimental study on spiral pulse detonation engines[J]. Journal of Experiments in Fluid Mechanics, 2012, 26(2): 12-16 (in Chinese). 王玮, 邱华, 范玮, 等. 螺旋式脉冲爆震发动机实验研究[J]. 实验流体力学, 2012, 26(2): 12-16.
[7] Wang C J, Xu S L, Guo C M. Experimental investigation on gaseous detonation propragation through a semi-circle bend tube[J]. Explosion and Shock Waves, 2003, 23(5): 448-453 (in Chinese). 王昌建, 徐胜利, 郭长铭. 气相爆轰波在半圆形弯管中传播现象的实验研究[J]. 爆炸与冲击, 2003, 23(5): 448-453.
[8] Yang Z, Zhou K Y, Xie L J, et al. Experimental study of flame transition in the "Z" type tube[J]. Fire Safety Science, 2006, 15(3): 111-115 (in Chinese). 杨志, 周凯元, 谢立军, 等. Z型管道中气体火焰传播规律的实验研究[J]. 火灾科学, 2006, 15(3): 111-115.
[9] Nakayama H, Moriya T, Kasahara J, et al. Stable detonation wave propagation in rectangular-cross-section curved channels[J]. Combustion and Flame, 2012, 159(2): 859-869.
[10] Nakayama H, Kasahara J, Matsuo A, et al. Front shock behavior of stable curved detonation waves in rectangular-cross-section curved channels[J]. Proceedings of the Combustion Institute, 2013, 34(2): 1939-1947.
[11] Zhou R, Wang J P. Numerical investigation of shock wave reflections near the head ends of rotating detonation engines[J]. Shock Waves, 2013, 23(5): 461-472.
[12] Frolov S M. Liquid-fueled air-breathing pulse detonation engines demonstrator: operation principles and performance[J]. Journal of Propulsion and Power, 2006, 22(6): 1162-1169.
[13] Frolov S M, Aksenov V S, Shamshin I O. Shock wave and detonation propagation through U-bend tubes[J]. Proceedings of the Combustion Institute, 2007, 31(2): 2421-2428.
[14] Frolov S M. Fast deflagration-to-detonation transition[J]. Russian Journal of Physical Chemistry B, 2008, 2(3): 442-455.
[15] Wang W,Qiu H,Fan W,et al. Experimental study on DDT characteristics in spiral configuration pulse detonation engines[J]. International Journal of Turbo & Jet-Engines, 2013, 30(3): 261-270.
/
| 〈 |
|
〉 |
CJA