Numerical Simulation For Propagation Behaviors Of A Shock Wave Through Perforated Plates Arrays

The propagation of shock waves in porous structures is one of the basic research topics in the fields of permeation sound wave,acoustics,filtration process and explosion protection in recent years.The phenomenon of interaction between shock waves and porous structures exists widely in industrial,military,medical and social life.With the development of science and technology and economy,as the research on the physical behavior of shock waves inside tunnel and corridor structures is of great research and practical value,drawing more and more scholars at home and abroad attention on relevant aspects,and the study on the propagation of shock waves in porous structures has become one of the main contents of scholars'research.Combined with the actual phenomenon,the author simplified the geometry of porous plate in practical application,obtained different geometric models,used the software of ICEM for grid production of computational domain,and the software of Fluent for numerical simulation of interaction between shock wave and perforated plate.By observing the general behavior of shock waves passing through perforated plate array,and analyzing the interaction between shock wave and perforated plate array with changing key flow and geometric of perforated plate arrays parameters,the following conclusions are obtained:?1?Both M₁ and M₂ of perforated plate have the effect of pressure's suppression,and M₂ of perforated plate has a more obvious effect.Both the reflected shock wave and the transmitted shock wave have the tendency of developing from the unsteady bow shock wave to the stable plane shock wave,and keep the state of propagation.?2?With the same number of holes,the shock wave and airflow pressure and velocity in front of the perforated plate array gradually decrease as the hole diameter increases.The larger the hole diameter is,the faster the shock wave velocity will be after passing through the perforated plate array,and the maximum pressure of each group of midpoints on the back wall surface of the perforated plate M₂ will increase.?3?When the diameter of the hole is the same,with the increase of porosity,the reflection intensity of the perforated plate array on the shock wave decreases,the transmission degree of the shock wave increases,the velocity of the shock wave passing through the perforated plate array increases,the velocity of the airflow after the wave decreases,and the time required for the airflow velocity after the wave to reach the stable state from the unstable decreases.With the increase of porosity,the maximum pressure at the midpoint of each group on the back wall surface of the M₂ of perforated plate increases.?4?With the increase of the number of plates,the perforated plate array has little influence on the reflection and transmission of shock waves.The shock wave velocity after the perforated plate array gradually decreases,and the maximum pressure at the middle point and the points on the sides decreases on the back wall of the last perforated plate,and the difference between them decreases.?5?With the same porosity,the number of holes has little influence on the reflection and transmission of shock waves before the perforated plate array and the shock wave velocity after the array;With the increase of the number of holes,the pressure of the airflow after the array gradually increases,and the airflow velocity gradually decreases.The maximum pressure of each group of midpoints on the backwall of the perforated plate M₂ gradually decreases with the increase of the number of holes.?6?With the increase of Mach number,the attenuation degree of shock wave passing through perforated plate array increases.The maximum pressure of the midpoint at the line z=0 mm on the backwall surface of the perforated plate M₂ is smaller between the sides.The midpoint pressure on the line z=y is greater than that on the sides;With the increase of the Mach number,the maximum pressure at each point gradually increases,and the pressure difference between the middle point of each group and the sides gradually increases.