Impact and Dispersion of Liquid Filled Cylinders

[+] Author and Article Information
John Borg

Department of Mechanical Engineering, Marquette University, 1515 W. Wisconsin Ave., Milwaukee, WI 53233

Susan Bartyczak

Center-Dahlgren Division, Naval Surface Warfare, Dahlgren, VA 22448-5100

Nancy Swanson

 Abacus Enterprises, 2582 Island View Ln., Lummi Island, WA 98262

John R. Cogar

 CORVID Technologies, 149 Plantation Ridge Dr., Suite 170, Mooresville, NC 28117

J. Fluids Eng 128(6), 1295-1307 (Apr 07, 2006) (13 pages) doi:10.1115/1.2353270 History: Received April 04, 2005; Revised April 07, 2006

The computational and experimental results of impact loading a thin wall liquid filled cylindrical target within a vacuum chamber are presented. The impact velocity ranges from 2.2 to 4.2kms. Both experimental and computational results are presented. It will be shown that impact dynamics and the early time fluid expansion are well modeled and understood. This includes the mass distribution and resulting expansion velocity. However, the late time dynamics, which includes the liquid breakup and droplet formation process of impacted liquid filled cylinders, is not well understood.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

(a) Target filled with 550ml of TBP and (b) schematic of gauge locations

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Figure 2

Two stage gas gun facility at University of Alabama’s Aero Research Laboratory

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Figure 3

Schematic of the target tank illustrating the location of the data acquisition equipment

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Figure 4

Projectile and target orientation illustrating coordinate system for the impact point listed in Table 3. (a) Axial projectile target orientation. (b)90deg end down projectile target orientation.

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Figure 5

Shot line view demonstrating radially symmetric fluid expansion, test #40; (a) time ≈70μs, (b) time ≈200μs, and (c) time ≈305μs

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Figure 6

Downrange view, projectile moving right to left, test #40; (a) time ≈70μs, (b) time ≈200μs, and (c) time ≈305μs

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Figure 7

X-ray images of target response as compared to CTH calculations. (a) test #22, t=12.2μs, (b) test #42, t=68μs, and (c) test #43, t=116μs.

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Figure 8

Post impact x-rays illustrating dimensional variable nomenclature for test # 21 (a) Top view, t=57.6μs; (b) Side view, t=61.8μs

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Figure 9

Early time dimensionless parameterization for all the experimental test as compared to CTH calculations. (a) Dimensionless location of maximum expansion diameter. (b) Dimensionless radial expansion.

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Figure 10

Experimental and computational pressure traces, test #29; (a) long gauge and (b) short gauge

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Figure 11

Experimental and computational pressure traces with an Arrhenius Reactive Burn model: Long gauge test #29

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Figure 12

Eight consecutive images of the fluid shell taken from above the slit plate for test #24. The fluid is traveling from the bottom of the frame to the top.

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Figure 13

Results of four test shots each represents different phenomenology for different fluid properties given identical initial conditions

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Figure 14

Measured fluid thickness as seen in Fig. 1, test #27

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Figure 15

Computational simulation of fluid passing through slit plate. The effect of the slit plate on the fluid, specifically an increase in apparent fluid thickness, is calculated for test #27.

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Figure 16

Late time average fluid velocity after passing through slit plate; (a) axial velocity distribution and (b) Average expansion velocity

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Figure 17

Post impact debris. In each image, the target debris is presented on the left and the projectile debris is presented on the right. (a) Test #22, Impact velocity 2.2km∕s. (b) Test #29, Impact velocity 4.1km∕s.




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