Gas dynamics of gunpowder for clearance seal of ejection device in projectile base

Ma Huiming; Zhang Ya; Li Shizhong

doi:10.11883/1001-1455(2017)05-0976-07

Volume 37 Issue 5

Jul. 2017

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Ma Huiming, Zhang Ya, Li Shizhong. Gas dynamics of gunpowder for clearance seal of ejection device in projectile base[J]. Explosion And Shock Waves, 2017, 37(5): 976-982. doi: 10.11883/1001-1455(2017)05-0976-07

Citation:

Ma Huiming, Zhang Ya, Li Shizhong. Gas dynamics of gunpowder for clearance seal of ejection device in projectile base[J]. Explosion And Shock Waves, 2017, 37(5): 976-982. doi: 10.11883/1001-1455(2017)05-0976-07

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Gas dynamics of gunpowder for clearance seal of ejection device in projectile base

doi: 10.11883/1001-1455(2017)05-0976-07

Ma Huiming^{1, 2},
Zhang Ya^{1
,
,},
Li Shizhong¹

1.
School of Mechatronic Engineering, North University of China, Taiyuan 030051, Shanxi, China
2.
School of Information and Communication Engineering, North University of China, Taiyuan 030051, Shanxi, China

Received Date: 2016-06-14
Rev Recd Date: 2016-10-26
Publish Date: 2017-09-25

Abstract

Abstract

The present study addresses the potential damage that might be suffered by the test device of a projectile body as a result of the gun powder gas coming from the clearance opened in the projection base for installing an ejection device for the recovery of the penetration data. A seal structure of the clearance was designed and a model was built for analyzing the dynamical state of the gunpowder gas flowing in the clearance. The chamber pressure and the seal cavity pressure of the seal structure were tested by experiment. The results show that the gas in the gunpowder combustion was a compressible gas, flowing in a subsonic condition in the powder chamber and the contracting clearance channel, but in a supersonic condition in the expansion seal cavity. When the gunpowder gas in the projection base was sealed by the seal structure and kept at a temperature of 2 166.5 K, a density of 360 kg/m³ and a pressure of 242.9 MPa, the pressure for the residual gas in the seal cavity was 0.49 MPa. The maximum pressure of the test curve in the seal cavity pressure was 0.18 MPa, fairly consistent with the theoretical results. These results can serve as reference for fabricating the seal of the high temperature and high pressure gunpowder gas in the projection base.
- projection base,
- gunpowder gas,
- flow parameter,
- gas dynamics,
- clearance seal,
- labyrinth seal,
- seal ring

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References(22)

References

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