Investigation of Street Canyon Phenomena in Large-Scale Turbulence

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Wind tunnel experiments of wind structure around buildings located along a heated street and cooling phenomena of the street were conducted by using atmospheric wind tunnels. The experimental parameters were a street width, the height and the arrangement of the buildings, the turbulent intensity of a cross flow. The smoke wire method for flow visualizations and a thermal camera for the thermal measurements of the street surface were employed.(1) Main flows which affect on the cooling of the street were (a) separated flows from the roof of upstream -side buildings, (b) flows between buildings located side by side, (c) circulation flows behind upstream-side buildings or in front of downstream-side buildings, (d) wake behind upstream-side buildings by turbulent motions.(2)By turbulent motions, the temperature distributions of the street were more uniform in the large-scale turbulence than in the grid turbulence.(3)In the case of downstream-side buildings which are taller than upstream-side buildings, the streetsurface around front of the downstream-side buildings was remarkably cooled by stable circular flows in front of down-side buildings.(4) Street temperature was more uniform on the narrow street than on the wide street.(5) The database was built up for urban planning.