Numerical investigations on propagating characteristics of shock waves in different triangle wedges

Zheng Chun; Chen Zhihua; Zhang Huanhao; Sun Xiaohui

doi:10.11883/1001-1455(2016)03-0379-07

Volume 36 Issue 3

Oct. 2018

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Zheng Chun, Chen Zhihua, Zhang Huanhao, Sun Xiaohui. Numerical investigations on propagating characteristics of shock waves in different triangle wedges[J]. Explosion And Shock Waves, 2016, 36(3): 379-385. doi: 10.11883/1001-1455(2016)03-0379-07

Citation:

Zheng Chun, Chen Zhihua, Zhang Huanhao, Sun Xiaohui. Numerical investigations on propagating characteristics of shock waves in different triangle wedges[J]. Explosion And Shock Waves, 2016, 36(3): 379-385. doi: 10.11883/1001-1455(2016)03-0379-07

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Numerical investigations on propagating characteristics of shock waves in different triangle wedges

doi: 10.11883/1001-1455(2016)03-0379-07

1.
Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
Aerospace System Engineering, Shanghai 201109, China

Received Date: 2014-10-24
Rev Recd Date: 2015-01-22
Publish Date: 2016-05-25

Abstract

Abstract

The reflection and focusing of the shock wave propagating into a convergent tube can create a high-temperature and high-pressure region, which is significant for the detonation engine to induce the mixed combustible gases to detonate in ignition. Based on the N-S equations and combined with the five order WENO scheme, the phenomena of the shock wave reflection and focusing in the triangular wedge have been numerically simulated with the Mach number as 6. The numerical results reveal that the modification of the vertex angles has an obvious influence on the kind of shock reflection and the shock wave focusing. With the vertex angle getting bigger, the shock wave transforms from the Mach reflection to the transitional-Mach and the double-Mach reflections, and the jetting on the ramp surface becomes more evident. The high-temperature and high-pressure region generated after the first collision of the triple points can then satisfy the ignition condition of the mixed combustible gases. The temperature and the pressure will rise with the vertex angle getting bigger, and approach the maximum as the shock wave reaches the critical point of the double-Mach reflection on the wedge. However, the shock wave turns to the regular reflection on the wedge when the vertex angle exceeds the angle of the critical double-Mach reflection, and the triple points will not collide. Therefore, no high-temperature and high-pressure region is generated under this condition.
- mechanics of explosion,
- propagating characteristics,
- shock wave,
- triple point,
- Mach reflection,
- double Mach reflection,
- jet

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References(16)

References

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