典型柱形装药水下爆炸冲击波与气泡脉动荷载特性OA

Clarifying the distribution of underwater explosion loads for cylindrical charges is the premise of predicting the damage effects on hydraulic structures under blast loading.First,the numerical simulation method for underwater explosion induced by cylindrical charge was proposed,and its reliability was verified by comparing the simulation results with the existing test data on the blast wave peak pressure and bubble shape.Then,a series of simulations were conducted for a typical warhead in the free and reflected fields.The load distribution law was studied from the perspectives of the pressure and impulse distributions of the blast wave and bubble pulsation as well as the bubble shape.The results indicate that the incident peak pressure of the blast wave exhibits axial attenuation and lateral enhancement,while the charge shape has limited influence on the impulse distribution.The reflected peak pressure of the blast wave follows an inverted bell-shaped distri-bution.The reflection coefficient of horizontal cylindrical charge gradually decreases with the increase of the incident angle,whereas that of vertical charge shows a saddle-shaped variation.The Bjerknes effect induced by the structural surface tilts the bubble jet,resulting in the higher pulsating pressure and impulse than those in the free field and forming a V-shaped high-intensity zone surrounded by an annular low-intensity region.