Numerical simulation of propagation law of explosion shock wave in variable cross-section channel
In order to study the propagation law of the explosion shock wave in the variable cross-section channel,numerical simulation of the TNT explosion inside the variable cross-section channel is carried out using LS-DYNA software.In LS-DYNA,the shock wave propagation maps in different cross-section variations and the overpressure time course curves at different measurement points were analyzed,and the effects of the rate of change of cross-section size and the rate of change of cross-section length on the propagation of the explosion shock wave in the variable cross-section channel were investigated.The results show that:When the cross-section is changed from small to large,as the cross-section area increases,the wave dissipation first decreases rapidly and then increases slightly and then decreases again.The larger the overall cross-sectional area,the better the wave dissipation;When the cross-section from large to small,the explosion of shock waves in the section just into the reduced section,part of the direct form of plane waves into the reduced section,part of the changes with the cross-section of the wall collision reflections,reflections make the part of the explosion of shock wave overpressure and propagation in the opposite direction.When the small cross-section reduced to half of the original,the exit of the measured explosive shock wave equivalent to the original two times the number of drugs in the through-channel explosion of the shock wave;At the same time,the fitting equations for the propagation of shock wave overpressure peak along the variable cross-section straight channel under different working conditions are obtained,which can provide a theoretical basis for the study of new wave dissipation system.
explosion shock waveoverpressurevariable cross-section channelnumerical simulationwave attenuation system
NETL
NSTL
万方数据
维普
