Analysis of aerodynamic noise of split tees of air ducts with different structures

This paper takes the split tee of air ducts in air conditioning systems as the research object, and uses the combined simulation method of Fluent and Actran to explore the influence of changing the cross-sectional dimension and curvature radius of the branch pipe on the aerodynamic noise of the tee. The flow field and sound field characteristics of the tee are studied through numerical simulation, and the results show that the airflow in the branch pipe of the tee is unstable, there are acceleration zones and recirculation zones, and the sound pressure level of aerodynamic noise of the branch pipe is the largest. Velocity stratification, velocity gradient and gas recirculation lead to gas turbulent motion, generating vortices and pulsations, which are the main reasons for the aerodynamic noise of the tee. When the curvature radius is R, 2R, 3R and 4R, respectively, the maximum sound pressure level difference monitored in the branch pipes can reach 10.63 dB, and the 4R curvature radius is the most suitable.