Abstract
Predictions and measurements of the three-dimensional structure of flow fields inside an outdoor unit of a split-type room air conditioner are presented. The three-dimensional incompressible Navier-Stokes equations in a moving reference frame are solved on tetrahedral meshes. A sliding mesh technique is utilized to characterize unsteady interactions. The accuracy of the predicted flow fields is evaluated by comparsion to measurement results taken with a laser particle image velocimetry (PIV). Results show that the outdoor unit has a complex vortical flow field near blade tips. Its formation starts on the blade tip suction side and decreases in magnitude on the pressure side. With the computed unsteady viscous flow solutions, the discrete frequency noise radiated from the unit is predicted. The numerical results are compared with the measured radiated noise levels.
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