通風開口部の流入気流と圧力損失に関する実験的研究

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Cross-ventilation is a valuable tool in achieving comfortable indoor temperatures in humid areas with high summer temperatures. Howevever, the simplified design procedure for utilizing cross-ventilation is a not estabilshed yet, because the interaction of the internal flow with the envelope flow greatly complicates the flow characteristics inside a room. The wind tunnel is the best way to account for wind effects and measure directly ventilation flow rates. In this study, split-film probes measured the directional velocities and turbulence levels inside and outside a cross-ventilated model. The penetrating flow entered the inlet opening at steep declining angles due to the front eddy and the downwash flow along the upwind face. The penetrating flow flowed downwards the floor. Internal turbulence spectrum of the main stream remained the same as that of the oncoming flow, but the spectra of other components were produced by the inlet and internal turbulence. The ventilation flow rates decreaded until 45° ≦ θ. The Pitot tube was set for the incidence angles of the penetrating flow obtained by the split-film probes at the upwind opening. The pressure loss coefficients for the inlet opening were calculated from the pressure difference between the total pressure and intermal pressure. It was found that the pressure loss coefficients greatly depended on wind directions and incidence angles of the penetrating flow.
社団法人日本建築学会の論文
2002-02-28

通風開口部の流入気流と圧力損失に関する実験的研究

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