An Analysis of the Different Flow Characteristics of a Closed Bomb Test in Cylindrical and Spherical Closed Vessels
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A zirconium/potassium perchlorate (ZPP) mixture is ignited inside cylindrical and spherical closed vessels. The performance of an explosive is measured via pressure histories. Each experiment maintains the same conditions (other than vessel shape), but the outputs indicate different pressure characteristics. The cylindrical vessel shows oscillating pressure values, while the spherical vessel exhibits dampened pressure values. A 2-D numerical simulation and a 0-D performance analysis are thus utilized to reveal the physical phenomena inside the vessels and select the adequate vessel shape for the test. It is determined that the different pressure characteristics occur due to the different pressure shock wave movements generated by the rapid ZPP combustion. The cylindrical vessel retains its shock longer than the spherical vessel because the cylinder has a constant cross-sectional area. The spherical vessel has a narrow–wide–narrow shape, which consistently reflects the side of the shock wave along with its propagation. A flow visualization inside the thick closed vessel provides elementary understandings on the closed bomb test that helps to interpret the combustion characteristics.
KeywordsClosed bomb test (CBT) Pyrotechnics Reactive two-phase flow
This work was supported by the Agency for Defense Development under the ‘A precise energy release for the pyrotechnic mechanical device’ program.
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