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Tuesday, July 9 • 11:30 - 11:50
COMPRESSIBLE FLOW SIMULATION OF FLOW AND NOISE AROUND AN AXIAL-FLOW FAN REGARDING EFFECTS OF CASING SLITS

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The aerodynamic noise of small axial-flow fans in a duct for cooling electronic equipment was investigated by compressible flow simulations based on the compressible Navier-Stokes equations. The volume penalization method was adopted in order to predict the flow and acoustic fields around complex geometries and moving objects, such as the rotor and struts, with a rectangular computational grid. The predicted performance and sound pressure spectrum were compared with those measured. The predicted results show that the acoustic radiation due to the interference of the wake of the blades and the struts generates the pressure fluctuations with a staggered pattern in the duct. Also, for the condition at a design point, the tonal sound was found to occur more intensely for the casing with slits compared with that without them. The predicted flow fields for the casing without slits present that the tip vortices around the blades are convected in the circumferential direction and interact with the pressure surface of the neighboring blade. Also, the flow separation at the leading edge on the suction surface becomes larger and the flow around the blades becomes more turbulent. As a result, the periodic interactions between the wakes and the struts are weakened, although the broadband noise was more intensely radiated. Meanwhile, the tonal sound is intensely radiated even for the casing without slits at an approximate maximum flow rate.

Moderators
KH

Kaveh Habibi

Sr. Aeroacoustics Engineer, Siemens Gamesa Renewable Energy
LM

Luc Mongeau

Prof., McGill University
MR

Michel Roger

Professeur, Ecole Centrale de Lyon

Authors

Tuesday July 9, 2019 11:30 - 11:50 EDT
St-Laurent 6
  T03 Aero… aircrft noise & vibr., RS01 Aeroacoustics