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Interior Ballistics

Experimental Study and Numerical Simulation on Propagation Properties of a Plasma Jet in a Cylindrical Liquid Chamber

[+] Author and Article Information
Yonggang Yu

e-mail: yyg801@mail.njust.edu.cn

Dongyao Liu

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

Manuscript received July 29, 2012; final manuscript received August 22, 2012; accepted manuscript posted January 7, 2013; published online April 19, 2013. Assoc. Editor: Bo S. G. Janzon.

J. Appl. Mech 80(3), 031406 (Apr 19, 2013) (11 pages) Paper No: JAM-12-1355; doi: 10.1115/1.4023316 History: Received July 29, 2012; Revised August 22, 2012; Accepted January 07, 2013

A simulator is designed to explore the interactive mechanism of a plasma jet with the liquid medium in the bulk-loaded liquid electrothermal chemical launching process. The properties of the plasma jet expanding in the liquid and the mixing characteristics of the plasma jet with liquid in the cylindrical chamber are studied using a high speed camera system. According to the experimental results, a two-dimensional axisymmetric unsteady compressible flow model has been proposed. The transient characteristics of the jet in flow field have been simulated. The results indicate that, during the expansion of the plasma jet in the liquid medium, there is relatively strong turbulent mixing. The interface between the two phases is not smooth and fluctuates with time stochastically. The higher the discharge voltage is, the stronger the Helmholtz instability effect will be. The Taylor cavity forming during the jet expansion can be divided into three regions: the main flow region, the compression region, and the backflow vortex region. In the main flow region the temperature and velocity of the plasma jet are relatively high and both decrease along the axial and radial direction. The pressure near the Taylor cavity head is high. The high pressure region grows gradually while the pressure value decreases. The calculated axial expansion displacement of the Taylor cavity coincides well with the measured one from experiment.

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Figures

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Fig. 1

Experimental simulator

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Fig. 2

The subsequent snapshots of the plasma jet propagation in cylindrical chamber (Uc = 2100 V, d0 = 2 mm)

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Fig. 3

Taylor cavity's axial displacement and velocity versus time

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Fig. 4

Taylor cavity's radial displacement and velocity versus time

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Fig. 5

Effects of discharge voltage on the expansion of the plasma jet

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Fig. 6

Computational domain

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Fig. 7

Interface of the Taylor cavity and streamline of flow field

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Fig. 8

Comparison of experimental and calculated values of Taylor cavity's axial displacement

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Fig. 9

Relative static pressure distributions (Pa)

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Fig. 10

Velocity distributions (m/s)

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Fig. 11

Partition of the Taylor cavity

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Fig. 12

Temperature distributions (K)

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Fig. 13

Axial displacement versus time under different jet pressure conditions

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Fig. 14

Distribution of pressure and temperature on the axis under different jet pressure conditions

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Fig. 15

Pressure versus time at different axial positions under different jet pressure conditions

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Fig. 16

The time sequences of Taylor cavity's expansion with different nozzle diameters

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Fig. 17

Axial displacement of the Taylor cavity versus time with different nozzle diameters

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Fig. 18

Distribution law of pressure and temperature in space-time with different nozzle diameters

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Fig. 19

Axial displacement of Taylor cavity versus time with different liquid densities

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Fig. 20

Distribution law of pressure and temperature on the axis with different liquid densities

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Fig. 21

Pressure versus time with different liquid densities (x = 35 mm)

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