Prediction research on the up float distance of the explosion bubble

DOI:	10.11809/bqzbgcxb2024.05.017
Keywords:	underwater explosion; bubble; up float distance; maximum of bubble pulsate pressure; experiment
Abstract:	The up float distance of the explosion bubble has been investigated by using theoretical analysis and underwater explosion test methods. First, the computation formula of up float distance of the explosion based on experiment measurement period has been gained according to the direct proportion relationship between non dimension up float distance and period of explosion bubble. The computation formula of the up float distance in infinity water region has been indentified based on experimental results of bubble up float distance. The computation formula of the up float distance has been gained considering boundary conditions. Second, the up float distance has been computation based on the measurement period. The value has been compared with the theory analysis results. The results show that they coincide well. The real maximum of bubble pulsate pressure have been computation by using up float distance and the maximum of shock wave. The ratio coefficients of real and test maximum value has been achieved. The up float distance has been computation by using the maximum of bubble pulsate pressure and the maximum of shock wave pressure. The value has been compared with the results that have been gained by calculating test period. The average error is 3.68%. Finally, considering the influence of the boundary condition, the up float distance of small mass dynamite has been calculated and compared with the experiment results. The average error of the experiment and theory computation results is 7%. The results show that bottom boundary make the bubble period become longer and the bottom absorbability function make the up float distance become smaller. That leads the computation error. The test results of the maximum of bubble pulsate pressure become bigger because of the cavitations effect. The deviation between calculated results and experiment results is small. That testified validity of the computation model.
Published:	2024-05-31
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