21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-7.6.2

EXPERIMENTAL INVESTIGATION OF A DIFFUSER FOR COOLING AND AIR CONDITIONING SYSTEM

Bayramgil V., Bayrak S., Yukselen M. A., Erim M. Z.
Technical University of Istanbul, Turkey

Keywords: experimental investigation, diffuser, cooling, air conditioning system

In the present work the flow in a diffuser mounted at the exit cross-section of an air-conditioning system fan has been studied. In the first step, the exit flow condition of the fan has been studied and then, for various diffuser divergence angles, the flow parameters and the separation regions have been examined using the wool-tuft method. For the quantitative examination of the diffuser flow at various divergence angles, wall static pressure distributions have been measured using a pressure scanning valve. The diffuser exit mean flow condition and the turbulence level have been measured using pitot-static tube. All these investigations show that the flow is not uniform at the exit of the diffuser and the turbulence level shows important variations from point to point. On the other hand, the flow in the diffuser is separated at all diffuser divergence angles except less than five degrees for which the flow of the duct is considered approximately uniform.

view full paper