Abstract: 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.

Key words: pistol, movingbullet, jetnoise, muzzleflowfield, largeeddysimulation, computationalaeroacoustic