Normal Impingement of an Axisymmetric Turbulent Air Jet : Experiments

Abstract

In order to clarify the flow characteristics of a circular turbulent air jet impinging normally onto a fiat surface, the distributions of jet velocity and its turbulence intensity in the impingement region of the jet were measured in detail by hot-wire anemometry by changing the jet nozzle diameter, initial jet velocity and impinging height etc.. Consequently, those measurements were found to be similar to the velocity distribution in the free or wall jet region respectively, and also showed a reasonable agreement with the results calculated numerically assuming a new velocity distribution on the inflow boundary line of the impingement region.