Optimization of aerodynamic acoustics in the pipe with variable cross-sections

The study calculated the steady flow field, transient flow field and aerodynamic noise of a variable cross section pipe by combining ANSYS Fluent with LMS Virtural. Lab. The analysis included the streamline, flow velocity, pressure, and turbulent flow energy of the steady flow field, as well as the noise characteristics at the pipe exit. The pipe's aero-acoustic performance was optimised, and the flow field and acoustic performance of the optimized pipe were analysed. The research indicates that the vortices, pressure loss and aero-acoustics can be reduced by adding a chamfer or fillet at the abrupt change of pipe cross section. The chamfer is more effective in reducing vortices, while the fillet is more effective in reducing pressure loss and pipe noise. This research provides valuable insights for designing low-noise pipes.