输气管道中气体流过阀门后,由于流通面积的改变导致压力和流速变化,从而在阀门处产生较大噪声。以气动噪声仿真理论为依据对闸阀噪声产生机理进行研究,使用FLUENT软件对不同开度下的流场进行仿真,并对声压和声功率的分布规律进行分析。得到噪声的产生机理是因为流体受到闸阀壁面阻挡产生涡流所致,从频率来讲,噪声主要存在于低频区域,这使得噪声可以传播较远距离。在传播过程中,距离阀门越远,噪声的衰减速度越慢,这使得噪声的影响范围大大增加。噪声产生机理的研究为阀门降噪措施的研究奠定了基础。 After the gas in the gas pipeline flows through the valve, the pressure and the flow rate change due to the change of the flow area, thus generating relatively noises at the valve. Based on the theory of aerodynamic noise simulation, the generation mechanism of gate noise was studied. The flow field under different opening degrees was simulated by FLUENT software, and the distribution of sound pressure and acoustic power was analyzed. The reason why the noise is generated is that the fluid is caused by the vortex flow blocked by the gate of the gate valve. In terms of frequency, the noise mainly exists in the low frequency region, which makes the noise can propagate for a long distance. In the process of propagation, the farther away from the valve, the slower the attenuation of the noise, which greatly increases the influence range of the noise. The research of noise generation mechanism lays the foundation for the research of valve noise reduction measures.