Abstract
The objective of this experimental study is to determine processes of a vertical turbulent pollution transport above the X-shaped street intersection in an idealised symmetric urban area for several approach flow directions. An experimental set-up for simultaneous measurement of the flow velocity and the tracer gas concentration in a high temporal resolution is assembled. Vertical turbulent scalar fluxes are computed from the measured data in a horizontal plane above the street intersection. The quadrant analysis was applied to the vertical turbulent pollution fluxes data. Events with dominant contribution to vertical turbulent pollution flux were detected. The mean duration, repetition frequency and the duration percentage were computed for these events. A strong influence of the approach flow direction on the the type of dominant events and their characteristics was resolved.
Highlights
Dispersion of air pollution within urban areas is an important aspect of the environment quality for a significant part of the population
The quadrant analysis was applied to the vertical turbulent pollution fluxes data
We focused on vertical turbulent pollution transport in a complex and highly three-dimensional flow and concentration fields above the idealised street intersection
Summary
Dispersion of air pollution within urban areas is an important aspect of the environment quality for a significant part of the population. We focused on vertical turbulent pollution transport in a complex and highly three-dimensional flow and concentration fields above the idealised street intersection. The quadrant analysis is applied newly to the turbulent scalar flux in highly turbulent a tree dimensional flow in this work. This section was equipped by turbulent generators at the beginning and covered by 50 mm and 100 mm high roughness elements on the floor, see the photo in figure 2.
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