Experimental and computational evaluation of an ejector system utilizing a primary S-bend transition duct

An experimental and computational study was performed to determine the performance of an air-air ejector system utilizing a primary S-bend transition duct.; For the duct configuration, the results show an increase in offset produced a more distorted flow at the duct outlet, generating higher losses and back pressure, poorer pressure recovery and a lower diffuser effectiveness. With the increase of inlet swirl, a decrease in the duct pressure recovery was observed. This was directly associated with a higher duct back pressure.; For the ejector configuration, the results showed an increase in pumping performance for an increase in swirl, mixing tube length, area ratio and standoff. An optimum standoff value of 0.25Dh2 was observed.; The results show that the realizable k-epsilon turbulence model was quite capable of modeling the complex flow, and correctly predicted all main flow features as well as performance trends for all geometrical configurations tested. However, the CFD seemed to under predict the viscous losses of the flow which led to an over prediction of back pressure. (Abstract shortened by UMI.)...