Effect of reflection type on detonation initiation at shock-wave focusing

Shock Waves ◽  
2000 ◽  
Vol 10 (3) ◽  
pp. 205-215 ◽  
Author(s):  
A.M. Bartenev ◽  
S.V. Khomik ◽  
B.E. Gelfand ◽  
H. Grönig ◽  
H. Olivier
Keyword(s):  
Shock Wave ◽  
Detonation Initiation ◽  
Wave Focusing ◽  
Shock Wave Focusing

Numerical Research on the Toroidal Shock Wave Focusing Detonation Initiation

2019 ◽  
Author(s):  
Xiang Chen ◽  
Ningbo Zhao ◽  
Hongtao Zheng ◽  
Xiongbin Jia ◽  
Shizheng Liu ◽  
...  
Keyword(s):  
Shock Wave ◽  
Detonation Wave ◽  
Detonation Initiation ◽  
Operating Conditions ◽  
Initiation Mechanism ◽  
Wave Focusing ◽  
Jet Flame ◽  
Rotating Detonation Engine ◽  
Detonation Engine ◽  
Shock Wave Focusing

Abstract Pressure gain combustion (PGC) is considered to be a potential technology to increase the cycle efficiency of gas turbine. As one viable candidate for PGC, rotating detonation engine (RDE) draws more attention due to its significant advances in continuous mode of operation. In practical, one of the basic challenges for RDE application is to reliably initiate detonation wave. For this purpose, both detonation initiation mechanism and enhancement approach are urgently needed to be understood. In this work, a toroidal shock wave focusing detonation initiator is presented. On this basis, the two-dimensional numerical simulations are carried out to investigate the detonation initiation characteristics by using the toroidal shock wave focusing. All of the flame acceleration, shock wave focusing, detonation wave forming and propagation are analyzed in detail. The numerical results show that the toroidal shock wave focusing initiator developed in this study can rapidly realize the detonation initiation over a short distance and performs significantly better than the traditional smooth or obstructed tube based imitators under different operating conditions. Under the same operating condition, the novel developed initiator decreases time of 59.2% and distance of 84.7% for the smooth tube based initiator, and time of 52% and distance of 78.9% for the obstructed one. Besides, the multi-fields analysis indicates that both the local explosion induced by shock wave focusing in concave cavity and the entrainment vortex generated by shock wave and jet flame in front of diaphragm are important mechanisms to initiate detonation wave. The present study is expected to enhance the understanding of the physical mechanism of shock wave focusing detonation initiation and contribute to the development of detonation propulsion technology.

Numerical Research on the Toroidal Shock Wave Focusing Detonation Initiation

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Xiang Chen ◽  
Ningbo Zhao ◽  
Hongtao Zheng ◽  
Xiongbin Jia ◽  
Shizheng Liu ◽  
...  
Keyword(s):  
Shock Wave ◽  
Detonation Wave ◽  
Detonation Initiation ◽  
Operating Conditions ◽  
Initiation Mechanism ◽  
Wave Focusing ◽  
Jet Flame ◽  
Rotating Detonation Engine ◽  
Detonation Engine ◽  
Shock Wave Focusing

Abstract Pressure gain combustion (PGC) is considered to be a potential technology to increase the cycle efficiency of gas turbine. As one viable candidate for PGC, rotating detonation engine (RDE) draws more attention due to its significant advances in continuous mode of operation. In practical, one of the basic challenges for RDE application is to reliably initiate detonation wave. For this purpose, both detonation initiation mechanism and enhancement approach are urgently needed to be understood. In this work, a toroidal shock wave focusing detonation initiator is presented. On this basis, the two-dimensional numerical simulations are carried out to investigate the detonation initiation characteristics by using the toroidal shock wave focusing. All of the flame acceleration, shock wave focusing, detonation wave forming, and propagation are analyzed in detail. The numerical results show that the toroidal shock wave focusing initiator developed in this study can rapidly realize the detonation initiation over a short distance and performs significantly better than the traditional smooth or obstructed tube based imitators under different operating conditions. Under the same operating condition, the novel developed initiator decreases time of 59.2% and distance of 84.7% for the smooth tube based initiator, and time of 52% and distance of 78.9% for the obstructed one. Besides, the multifield analysis indicates that both the local explosion induced by shock wave focusing in concave cavity and the entrainment vortex generated by shock wave and jet flame in front of diaphragm are important mechanisms to initiate detonation wave. This study is expected to enhance the understanding of the physical mechanism of shock wave focusing detonation initiation and contribute to the development of detonation propulsion technology.

Numerical investigation on detonation initiation using toroidal shock wave focusing

2019 ◽  
Vol 92 ◽  
pp. 300-313 ◽  
Author(s):  
Xiang Chen ◽  
Ningbo Zhao ◽  
Xiongbin Jia ◽  
Shizheng Liu ◽  
Hongtao Zheng ◽  
...  
Keyword(s):  
Shock Wave ◽  
Numerical Investigation ◽  
Detonation Initiation ◽  
Wave Focusing ◽  
Shock Wave Focusing

Effect of ignition parameters on detonation initiation using toroidal shock wave focusing

2021 ◽  
Vol 109 ◽  
pp. 106421
Author(s):  
Xiang Chen ◽  
Ningbo Zhao ◽  
Hongtao Zheng ◽  
Xiongbin Jia ◽  
Mingzhang Pan ◽  
...  
Keyword(s):  
Shock Wave ◽  
Detonation Initiation ◽  
Wave Focusing ◽  
Shock Wave Focusing

scholarly journals Shock wave focusing in water inside convergent structures

2012 ◽  
Vol 6 (3) ◽  
pp. 267-282 ◽  
Author(s):  
Chuanxi Wang ◽  
Veronica Eliasson
Keyword(s):  
Shock Wave ◽  
Wave Focusing ◽  
Shock Wave Focusing

scholarly journals Deformation and Collapse of a Liquid Column by Shock Wave and Shock Wave Focusing.

1993 ◽  
Vol 59 (563) ◽  
pp. 2105-2110
Author(s):  
Teruhiko Yoshida ◽  
Kazuyoshi Takayama ◽  
Masakazu Hamamura
Keyword(s):  
Shock Wave ◽  
Liquid Column ◽  
Wave Focusing ◽  
Shock Wave Focusing
Sign in / Sign up

Export Citation Format

Share Document