Abstract
In a study of jet of late years, Technology about the active control of jet early area attracts attention. Then, we take that we controlled a jet into and we collected data about availability of secondly film flow. An influence in jet initial field by adding thin annular flow to the main jet was studied experimentally. The thin annular flow defined the secondary film flow. Jets used Air. Then, velocity distribution was measured by the LDV in the initial field. It is found out that the region change of the potential core and outbreak domain of entrainment due to change of the slit interval and velocity ratio of secondary film flow.
