scholarly journals Use of spectra of hydroacoustic recordings of large underwater explosions to calculate iterative estimates of the bubble oscillation sequence

1984 ◽  
Vol 76 (S1) ◽  
pp. S69-S69
Author(s):  
James N. Griffin ◽  
Galen W. Pound ◽  
Ronald S. Cunfer
Keyword(s):  
Bubble Oscillation ◽  
Underwater Explosions

Experimental and numerical investigation of bubble oscillation and jet impact near a solid boundary

2021 ◽  
Vol 138 ◽  
pp. 106606
Author(s):  
Hongfeng Zhang ◽  
Zhubi Lu ◽  
Penghua Zhang ◽  
Jiayang Gu ◽  
Chunhui Luo ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Solid Boundary ◽  
Bubble Oscillation ◽  
Jet Impact

EMISSION BY UNDERWATER EXPLOSIONS

Geophysics ◽  
1970 ◽  
Vol 35 (3) ◽  
pp. 419-435 ◽  
Author(s):  
M. Lavergne
Keyword(s):  
Shock Wave ◽  
Frequency Band ◽  
Experimental Investigations ◽  
Water Interface ◽  
Single Charge ◽  
Seismic Effects ◽  
Underwater Explosions ◽  
Seismic Efficiency ◽  
Marine Life ◽  
Air Water Interface

Theoretical and experimental investigations of the seismic effects of underwater explosions of dynamite charges are described. We investigate the acoustic efficiency in a broad frequency band and in the seismic frequency band, the partition of energy between the shock wave and bubble pulses, the seismic effects of cavitation due to ghost reflection at the air‐water interface, and the damage caused to marine life. Results concerning the variation of the seismic efficiency with shot conditions are given: the conclusion is that the seismic efficiency of charges of the order of 100 gm can be considerably increased by dividing the charges and by shooting at depth. Experiments show that two or three properly spaced 50 gm charges of dynamite, shot at a depth of about 12 m, give the same result as a single charge of about 5 to 15 kg shot at a depth of 1 m. CDP marine sections comparing caged charge shooting with conventional shooting in the same area are shown.

Dynamic Loads Due to Blowdown Through a Sparger

2002 ◽  
Author(s):  
Yoon-Yeong Bae ◽  
Choon-Kyung Park ◽  
Seok Cho ◽  
Se-Young Chun ◽  
Chul-Hwa Song ◽  
...  
Keyword(s):  
Peak Pressure ◽  
Steam Pressure ◽  
Dynamic Loads ◽  
Positive Maximum ◽  
Air Mass ◽  
Bubble Oscillation ◽  
Water Storage Tank ◽  
Peak Loads ◽  
Valve Opening ◽  
Air Discharge

An experiment has been performed using a facility, which simulates the safety depressurization system (SDS) and in-containment refueling water storage tank (IRWST) of APR1400, an advanced PWR being developed in Korea, to investigate the dynamic load resulting from the blowdown of steam from a steam generator through a sparger. The influence of the key parameters, such as air mass, steam pressure, submergence, valve opening time, and pool temperature, on frequency and peak loads was investigated. The blowdown phenomenon was analyzed to find out the real cause of the initiation of bubble oscillation and discrepancy in frequencies between the experiment and calculation by conventional equation for bubble oscillation. The cause of significant damping was discussed and is presumed to be the highly tortuous flow path around bubble. The Rayleigh-Plesset equation modified by the introduction of method of image reasonably reproduce the bubble oscillation in a confined tank. Right after the completion of air discharge the steam discharge immediately follows and it condenses abruptly to provide low-pressure pocket. It may contribute to the negative maximum being greater than positive maximum. The subsequently discharging steam does not play as the driving force anymore. The effect of various parameters on the peak pressure and frequency was analyzed. The air mass, valve opening time, and submergence give significant effect on both of frequency and peak pressure while steam mass flux gives questionable effect and pool temperature gives almost none.

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