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RESEARCH PAPERS: Interior Ballistics

Study on Expansion Process and Interaction of High Speed Twin Combustion-Gas Jets in Liquid

[+] Author and Article Information
Yonggang Yu

School of Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, Chinayyg801@mail.njust.edu.cn

Shanheng Yan, Na Zhao, Xin Lu, Yanhuang Zhou

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

J. Appl. Mech 77(5), 051404 (May 17, 2010) (7 pages) doi:10.1115/1.4001288 History: Received July 29, 2009; Revised December 11, 2009; Published May 17, 2010; Online May 17, 2010

The multilevel stepped-wall and rectangular observation chambers are designed to study the multipoint ignition process and the combustion stability control mechanism of the bulk-loaded liquid propellant gun. The expansion process and interaction of high-speed twin combustion-gas jets in liquid are studied by means of a high-speed digital camera system. The influence of the nozzle diameter, dual-orifice interval, jet pressure, and chamber structure on the jet expansion shape is discussed. The results indicate that a larger ratio of diameter-to-length can suppress the jet instability in stepped-wall chambers. Higher axial expansion velocity is found under the larger injection pressure, which it increases the instability of jet expansion process. Compared with a rectangular chamber, the axial expansion velocity is smaller, and the radial expansion velocity is larger in stepped-wall chambers under the same conditions. The theoretical studies of interaction of the gas jet with liquid were developed based on the experiment. Two-dimensional unsteady models are used to get the pressure, density, and velocity contours. The numerical simulation results coincide well with the experiment.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

The scheme of the experiment equipment

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Figure 2

The interaction process of the twin jets with the liquid

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Figure 3

The expansion process of the twin jets in the rectangular chamber

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Figure 4

The comparison of the axial velocity

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Figure 5

The comparison of the radial velocity

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Figure 6

The comparison of the axial velocities under different ratios of ΔB/L

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Figure 7

The comparison of the axial velocities under different nozzle diameters

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Figure 8

The comparison of the axial velocity under different injection pressures

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Figure 9

The comparison of the axial velocity under different dual-orifice intervals

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Figure 10

The isobars of the twin jets in the stepped-wall chamber

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Figure 11

The pressure over time curves on the axial direction

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Figure 12

The pressure over time curves on the radial direction

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Figure 13

The isovelocities of the twin jets in the stepped-wall chamber

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Figure 14

The isodensity of the twin jets in the stepped-wall chamber

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Figure 15

The comparison of the expansion axial displacement of the experiment and the simulation

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Figure 16

The isobars of the twin jets in the rectangular chamber

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Figure 17

The isovelocity of the twin jets in the rectangular chamber

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Figure 18

The isodensity of the twin jets in the rectangular chamber

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Figure 19

The comparison of the expansion axial displacement of the experiment and the simulation

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