Formation mechanism of cavitating spalls |
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Authors: | M N Davydov V K Kedrinskii |
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Institution: | (1) Lavrent’ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090 |
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Abstract: | The dynamics of formation of cavitation zones in a liquid upon reflection of a shock pulse from the free surface is studied
numerically in a one-dimensional formulation using the Iordanskii-Kogarko-van Wijngaarden two-phase model. It is shown that
the formation of a system of cavitation zones (clusters) with a dynamically increasing volume concentration of the gas phase
near the free surface is due to oscillations of the structure of the rarefaction wave profile. The fast relaxation of tensile
stresses in the cavitation zone ends in the formation of a quasistationary mass-velocity field, which provides for almost
unbounded growth of cavitation bubbles in subsurface clusters and explains the occurrence of the spall layers observed in
experiments.
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 49, No. 2, pp. 65–73, March–April, 2008. |
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Keywords: | strength of liquid dynamic loading bubble cavitation spalls |
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