Abstract
Localized wall injection exists both in naturally occurring flows and in industrial applications, such as seepage of water from permeable soil layers in a river and film cooling of turbine blades. In these cases, the incoming flow is practically always subjected to disturbances, which in turn increases the turbulence level. In this experimental study, the combined effects of localized wall injection and background turbulence on the structure of turbulent channel flow are investigated for the first time.
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