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为了研究大口径超高速平衡炮的膛口流场特性,基于有限体积法,采用分块网格划分的整体运动处理方法,结合结构动网格技术,并采用N-S方程结合Realizable k-ε湍流模型,建立了膛口流场二维轴对称数值仿真模型。以300mm平衡炮为例,研究了1.72km/s,794m/s两种速度下的膛口流场特性。计算结果对比表明:1.72km/s初速的弹丸膛口流场与794m/s初速弹丸膛口流场结构相似,但其射流结构更加明显,流场结构整体略呈“狭长”状,火药燃气速度达到2.5km/s,但不能追赶并包围弹丸,弹丸速度达到Ma=4.03,1.0ms时基本摆脱了流场对其运动的影响。而常规初速弹丸流场结构呈“圆球”状,火药燃气对弹丸的影响较大,作用时间大于超高速发射情况,速度达到Ma=1.27,1.5ms时基本摆脱了流场对其运动的影响。
In order to study the flow field characteristics of the muzzle of a large diameter hypervelocity counterbalance gun, based on the finite volume method, the whole motion processing method based on the subdivision grid is used, combined with the moving mesh technology and the NS equations combined with the Realizable k-ε turbulence model , A two-dimensional axisymmetric numerical simulation model of muzzle flow field was established. Taking the 300mm counterbalanced gun as an example, the flow field characteristics of muzzle at two speeds of 1.72km / s and 794m / s were studied. The comparison of calculated results shows that the flow field of projectile muzzle at velocity of 1.72km / s is similar to the flow field of projectile muzzle at velocity of 794m / s, but its jet structure is more obvious. The structure of the flow field is slightly “slender” Gas velocity reached 2.5km / s, but can not catch up and surround the projectile, projectile velocity reached Ma = 4.03, 1.0ms basically get rid of the flow field on its movement. However, the flow field structure of the conventional muzzle velocity projectile is in the form of a “ball”, the influence of the projectile gas on the projectile is larger, and the action time is greater than that of the superhigh velocity launch. When the velocity reaches Ma = 1.27,1.5ms, Impact.