Add-on gas chamber technique for depressing load over cover system of underwater-launched missile

An add-on gas chamber technique for depressing load over cover system of underwater-launched missile was brought forward. Using 2-D axisymmetric model based on dynamic meshing technology and VOF model without phase transformation, the effects of volume and interface length of add-on gas chamber on load characteristics over cover system were modeled and simulated. According to different volume of add-on gas chamber and different interface length, four binds of working conditions were chosen. The results of different working conditions were compared and analyzed. Using this load-depressing technique, load characteristic over the cover is reduced obviously. The peak of negative pressure can depress load only when the volume of add-on gas chamber is big enough and the interface is long enough. The bigger the volume of add-on gas chamber and the longer the interface, the more obvious the effect of depressing load over cover system. The result offers reference for depressing load over cover system.