筒壁沟槽式火炮制退机的流场数值仿真

Numerical Simulation of Internal Flow Field of Barrel Grooved Gun Brake

为了研究某火炮筒壁沟槽式制退机在火炮后坐运动过程中内部流体的流动状态,研究不同后坐速度下制退力的特性,应用Fluent软件建立了制退机的等效流场模型,由工作腔压力和流量,推导出液压阻力系数K并分析流速、沟槽面积和液压阻力系数K的关系。对比分析仿真和实验数据表明:无论活塞杆匀速还是变速运动,同截面上两不同流道的流液速度几乎相等,且同截面不同流道的流量比近似等于各流道的面积比。

In order to study the flow state of the internal fluid of the grooved recoil brake on the barrel wall of an artillery during the recoil motion of the artillery and the characteristics of the recoil force at different recoil speeds,the equivalent flow field model of the recoil brake was established using Fluent software.From the pressure and flow rate of the working chamber,the hydraulic pressure resistance coefficient K was derived,and the relationship between the flow rate,groove area and hydraulic resistance coefficient K was analyzed.The comparative analysis of simulation and experimental data shows that no matter the piston rod moves at a constant speed or a variable speed,the flow velocity of two different channels on the same section is almost equal,and the flow ratio of different channels on the same section is approximately equal to the area ratio of each channel.