The Flow Field Analysis And Application Of Rarefaction Wave Gun

Rarefaction wave gun can not affect the muzzle velocity of the cases,reduce the interior gunpowder gas pressure,density,achieve the purpose of reduce recoil.Rarefaction wave gun flow field model was constructed,the flow field flow parameter calculation of rarefaction wave gun sat performance,appropriate methods and steps.Combined with the classical interior ballistic rarefaction wave gun interior ballistic model is established.The optimal bolt opening time is obtained by using the interior trajectory of a closed gun.Numerical simulation of the rarefaction wave gun interior ballistic model,the solution of interior flow parameter change rule,thus solving the recoil reduction efficiency.The rarefaction wave gun interior ballistic can simple describe the flow of the flow field in the chamber?In view of the rarefaction wave gun interior ballistic to solve the problem of large muzzle velocity error,established the rarefaction wave gun one-dimensional homogeneous flow interior ballistic model.Using one dimensional non conservative form of partial differential equations to describe the model,using MacCormack method to solve.Numerical simulation is carried out to verify the accuracy of the model.To solve the flow parameter of the rarefaction wave gun fire inside,took performance.The influence of the bolt opening time on the flow parameters in the bore was studied from several aspects,such as the bore pressure,the bore force,and the reduced rear-seat efficiency.Rarefaction wave gun one-dimensional all items flow model can meet the precision of the solution is simple and the flow field in the rarefaction wave gun fire,can explain the expansion wave in the flow field in the chamber process?Builds rarefaction wave gun open bars after three dimensional finite element model,using the grid structure,dynamic mesh technology and UDF Fluent flow field simulation,analysis of the flow field of the rarefaction wave gun case,calculate the recoil reduction efficiency.After opening bars rarefaction wave gun three-dimensional finite element model can accurate calculation of the flow of the whole flow field,but the operation is complicated,long computing time.