关键词: 汽车管路；计算流体力学；气动噪声；噪声声功率

Abstract: Automobile pipeline is one of the important sources of vehicle noise pollution. Although it is difficult to achieve complete silence during the operation of huge automobile pipeline system, if the process structure is optimized, abnormal noise can be effectively prevented and driving experience can be improved. This article is based on the basic principles of fluid mechanics, the law of conservation of energy, and other fundamental physics equations. The computational fluid dynamics (CFD) simulation software STAR CCM+ is used for finite element solution, and the noise analysis considers the Curle acoustic analogy model and Proudman acoustic analogy model. Numerical simulations are conducted on the flow field and sound field inside the pipe under the influence of different pipe connection methods. The analysis shows that connecting aluminum pipes and rubber pipes by attachment can easily make the pipe structure rough, resulting in uneven flow inside the pipe，and frequent fluctuations in velocity and pressure. On the contrary, the flow field inside the pipe connected by steel sleeves is stable and the number and amplitude of pressure changes are small. In addition, the peak noise power and decibels in the connection area of the steel sleeve connected pipeline are lower than those of the pipeline connected by the attachment method, which means that the possibility of noise pollution in the pipeline connected by the steel sleeve connection method is smaller. This article provides a reference for the simulation method of pipeline aerodynamic noise and the improvement of noise comfort caused by fluid aerodynamics during driving.

Key words: automobile pipeline; computational fluid mechanics; aerodynamic noise; noise sound power