空調システムにおける空力音と関連した非定常流動現象(流体機器・船舶・航空機(1),一般講演)

概要

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Three-dimensional structures of separated and vortical flow field have been investigated by Experimental Fluid Dynamics (EFD) analysis and Computational Fluid Dynamics (CFD) analysis on an air conditioning system. Complicated and vortical unsteady flow phenomena on the air conditioning system were captured by EFD analysis using high response pressure sensors and CFD analysis using commercial code, STAR-CD. The unsteady flow field of the air conditioning system is dominated by reverse flow on the scroll casing part near the cut-off and the longitudinal vortex on the enlarged casing part of diffuser. The unsteady complicated and vortical flow induces high pressure fluctuation linked to aero-acoustic phenomena. These phenomena can be explained by Helmholtz resonance and standing wave that arises from the combination of reflection and interference such that the reflected waves interfere constructively with the incident waves on the air conditioning system flow field. It is expected that the Helmholtz resonance and standing wave play a major role in specified frequency noises of the air conditioning system.
日本流体力学会の論文
2008-09-04