Study on Shock Wave Diffraction Effect of Cylindrical Shell and Pressure Distribution in Water Area under Underwater Explosion
The fluid-solid coupling numerical method was used to calculate the pressure change of the non-reflective,rigid and elastic cylindrical shell under the explosion shock wave of 200kg TNT explo-sive.The diffraction phenomenon of shock wave along cylindrical shell was analyzed,and the variation law of pressure field in the water near cylindrical shell was obtained.The composition of incident shock wave,reflected shock wave,diffracted wave and radiation wave of diffracted wave was analyzed by numerical calculation.The results show that radiation waves are mainly caused by structural de-formation and vibration.The location of pressure convergence point and peak pressure are related to the relative stiffness of the structure.The time of cavitation and the pressure generated are also relat-ed to the relative stiffness of the structure.
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