Experimental research on the law of flame spreading in the charge bed of a central ignition tube

XUE Shao; TAO Ruyi; WANG Hao; CHENG Shenshen

doi:10.11883/bzycj-2021-0030

Volume 41 Issue 11

Nov. 2021

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XUE Shao, TAO Ruyi, WANG Hao, CHENG Shenshen. Experimental research on the law of flame spreading in the charge bed of a central ignition tube[J]. Explosion And Shock Waves, 2021, 41(11): 112101. doi: 10.11883/bzycj-2021-0030

Citation:

XUE Shao, TAO Ruyi, WANG Hao, CHENG Shenshen. Experimental research on the law of flame spreading in the charge bed of a central ignition tube[J]. Explosion And Shock Waves, 2021, 41(11): 112101. doi: 10.11883/bzycj-2021-0030

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Experimental research on the law of flame spreading in the charge bed of a central ignition tube

doi: 10.11883/bzycj-2021-0030

School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

Received Date: 2021-01-21
Rev Recd Date: 2021-03-19

Available Online: 2021-09-27

Publish Date: 2021-11-23

Abstract

Abstract

In order to investigate the development of flame spreading in the charge bed of a central ignition tube, a visualized ignition experiment platform was designed, and experiments were carried out with different ignition charge masses and charge structures. A high-speed image acquisition system was used to record the propagation process of ignition flame in the propellant bed at 10000 frames per second, and a transient pressure recorder was used to obtain the variation of pressure with time and position in the chamber. In addition, a synchronous trigger was used to connect the high-speed image acquisition system, the transient pressure recorder and the ignition system of the experimental platform, giving the system a trigger zero point, which is convenient for the statistical analysis of subsequent experimental phenomena. The experimental results show that the time of flame-appearing from the ignition tube into the combustion chamber is 0.6 ms when the mass of the black powder is 20 g. However, the time increases to 1.5 ms when the mass of the black powder is 30 g. The average flame-spreading time of the stick charge structure is 2.2 ms, the average flame-spreading time of the granular charge structure is 3.4 ms, and the average flame-spreading time of the mixed charge structure is 3.1 ms. The results indicate that the mass of the black powder in an ignition tube has a significant effect on the time of flame-appearing from the ignition tube, and the higher black powder mass lead to the longer flame-appearing time. The performances of flame-spreading in different charge bed structures are quite different. The performance of flame-spreading in the stick charge structures is better than that in the granular charge structures and mixed charge structures. In addition, the pressure fluctuations will appear in the chamber due to gas choking in the granular charge structures. A mathematical model of the flame-spreading process was established by fitting the first-order exponential decay function according to the time sequence of the position of flame, and the goodness of fit is greater than 0.98.
- interior ballistic,
- visualization platform,
- ignition,
- mathematical model of the flame-spreading

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References(19)

References

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