抄録
We have been developing a local air conditioning system which supplies airflow locally to user for energy-saving. This system delivers composite jet formed by colliding jets from left and right nozzles installed on a wall to user. However, Coanda effect near the nozzle causes a collision point of both jets to shift, resulting in the jet not being delivered to the user. This research aims to enhance the energy conservation performance of local air conditioning system by evaluating the effect of nozzle aspect ratio (AR) and Reynolds number (Re) on suppression of the Coanda effect using numerical analysis to clarify the appropriate range of AR and Re. As a result, although the collision point of both jets hardly influenced by the Coanda effect in the low Re, it largely shifted to left by the Coanda effect in the high Re. From evaluation of the nozzle aspect ratio, although the collision point largely shifted to left by the Coanda effect at AR=21.4, it wasn’t influenced by the Coanda effect, and located in near the central axis even if high Re at AR=3.5.
