某小口径火炮多功能膛口装置流场数值仿真

针对小口径火炮身管长度和后坐力与无人作战平台不匹配、传统膛口装置功能单一等问题，设计集制退、 消声、消焰为一体的多功能膛口装置，提出一种适用于该膛口装置的超压分布模型。采用截短型火炮身管，利用Fluent 软件建立2 维轴对称气体动力学模型来计算膛口流场；采用大涡模拟模型，使用Ffowcs Williams and Hawkings 方法 计算噪声变化情况，结果显示，该膛口装置的制退效率为70%，消音率为17.8%，制退效率与实验误差为14%，消 音率与实验误差为11%。数值仿真结果表明：该膛口装置能有效降低火炮后坐力，并且在射击时有良好的隐蔽性， 满足现代战争的需要。

Numerical Simulation of Flow Field in Multifunctional Muzzle Device of Small Bore Gun

Aiming at the problems that the barrel length and recoil force of small bore gun do not match the unmanned combat platform, and the traditional muzzle device has a single function, a multi-functional muzzle device integrating recoil control, noise reduction and flame reduction was designed, and an overpressure distribution model suitable for the muzzle device was proposed. The muzzle flow field of a truncated gun barrel is calculated by using Fluent software to establish a two-dimensional axisymmetric gas dynamics model; The results show that the recoil efficiency of the muzzle device is 70%, the noise reduction rate is 17. 8%, and the error of the recoil efficiency and the noise reduction rate is 14% and 11% respectively. The results of numerical simulation show that the muzzle device can effectively reduce the recoil force of the gun, and has good concealment when firing, which meets the needs of modern warfare.