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The pressure field generated by a seismic airgun
journal contributionposted on 2023-05-18, 00:22 authored by de Graaf, KL, Paul BrandnerPaul Brandner, Irene PenesisIrene Penesis
A model-scale seismic airgun is used to investigate the behaviour and pressure field of the bubble generated at different standoffs from a steel plate and a free surface in an open top tank. The airgun is fired at 50 and 100 bar initial pressures and the field pressure, wall pressure and wall acceleration are recorded. Wavelet and Fast Fourier Transforms are used to analyse the bubble frequency. The reduction of pressure with distance from both the initial shock and first bubble collapse are presented. The hydrodynamic component of the pressure signal generated by the bubble collapses is also discussed. The trend of the bubble period for different standoffs from the free surface is compared with other data in the literature and found to be similar. The acceleration and displacement of the steel plate are presented for varying bubble standoffs, and as the plate moves in phase with the bubble, little pressure is felt from the collapse pulses. This information provides basic understanding of the dynamics of an airgun bubble when considering their application as a method of shock testing naval ships.
Publication titleExperimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics
Department/SchoolAustralian Maritime College
PublisherElsevier Science Inc
Place of publication360 Park Ave South, New York, USA, Ny, 10010-1710
Rights statementCopyright 2014 Elsevier Inc.