含运动弹头的手枪膛口射流噪声场特性

采用数值计算与试验研究相结合方法，分析某9 mm手枪膛口射流噪声场特性。基于计算流体力学与计算气动声学两步法，结合动网格技术，对含有运动弹头的手枪膛口燃气流场进行数值计算，即先采用大涡模拟方法计算膛口流场，得到声源积分面上的流体信息，再通过求解Ffowcs Williams和Hawkings声波动方程得到声源信息以及各个声监测点的声压信号，最终得到瞬态声场。为验证数值模型的可行性，将手枪试验结果与数值计算结果进行对比分析。结果表明：数值模型考虑弹头运动可以使计算结果更具准确性；数值计算所得各测点值与试验结果之间的误差均小于5%，证明了数值模型的正确性与可用性；研究结果对装有消声器的膛口噪声预测及膛口消声器的设计具有较好的参考价值。

Characteristics of Muzzle Jet Noise Field Including Moving Bullet of a Pistol

In order to study the characteristics of aerodynamic noise at pistol muzzle, the characteristics of jet noise field of a 9 mm pistol is studied through numerical calculation and experiment. The muzzle gas flow field of a pistol with moving bullet is numerically calculated by using the CFD-CAA two-step method and the dynamic mesh technology. The muzzle flow field is calculated to obtain the fluid information on sound source integral surface by the large eddy simulation (LES) method.Then the sound source information and the sound pressure signal at each sound monitoring point are obtained by solving the Ffowcs Williams-Hawkings（FW-H） sound wave equation, and finally the transient sound field is obtained. In order to verify the feasibility of the numerical model, the experimental results are analyzed in comparison with the numerically calculated results. The result shows that the numerical model considering the movement of bullet makes the calculation results more accurate；the errors of the measuring points values between the numerically calculated and experimental results are less than 5%, which proves the validity and availability of the proposed model. The research results and the proposed model can provide better reference value for the muzzle noise prediction and the design of muzzle silencer.