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Research Papers

Simulation of Contamination Prevention for Optical Window in Laser Ignition Systems of Large-Caliber Guns

[+] Author and Article Information
Changjun Ma

 School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, P.R.C.

Xiaobing Zhang1

 School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, P.R.C.zhangxb680504@163.com

1

Corresponding author.

J. Appl. Mech 78(5), 051014 (Aug 05, 2011) (7 pages) doi:10.1115/1.4004284 History: Received November 25, 2010; Revised May 23, 2011; Published August 05, 2011; Online August 05, 2011

In laser ignition systems, to ignite the propellant, the laser has to be transmitted into chamber through an optical window. If the optical window is destroyed by high pressure or high temperature or contaminated by the black powder residue, the ignition system will fail in further firings. The sapphire window can withstand the high pressure and high temperature of the ballistic cycle, but it is necessary to keep the window clean for the laser to transmit repeatedly. In modular charge systems or fully combustible cartridge cases, there is no place to put a shield window as in ammunition with stub base; thus a new contamination prevention method is put forward. In this method, the hydrodynamic force is used to divert the gas flow in a cavity located in the breech to avoid contact with the optical window and prevent it from being contaminated. To verify the effectiveness of this structure, a three-dimensional unsteady discrete phase model (DPM) coupled with an interior ballistic process was established. The simulation results indicated that the flow jet from the direct orifice was diverted, and particle debris did not contaminate the optical window due to the hydrodynamic force. Various factors influencing the contamination prevention effect were discussed, and the structure parameters were optimized.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of diverting jet flow structure

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Figure 2

Program flow chart of interior Ballistic coupled DPM model

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Figure 3

Pressure versus time profile of 155 mm gun

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Figure 4

Pressure contour of the symmetry plane at t = 0.05 ms

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Figure 5

Velocity vector of the symmetry plane at t = 0.05 ms

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Figure 6

Pathline of the flow field at t = 0.05 ms

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Figure 7

Particle scatter of the structure without a diverting orifice at t = 0.05 ms. (a) Integrated graph, (b) Local amplification of the cavity tube.

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Figure 8

Particle scatter at flow time t = 2 ms. (a) Integrated graph, (b) Local amplification of the cavity tube.

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Figure 9

Particle scatter of different sizes at t = 1 ms. (a) d = 0.05 mm, (b) d = 0.1 mm, (c) d = 0.5 mm.

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