Analysis of dual-phase ejector performance
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[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] An analytical model is proposed to extend the single-phase model for predicting ejector performance, particularly pressure recovery and efficiency, to entrained fluids of a liquid/gas mixture. Liquid ejector performance is studied experimentally when the entrained fluid is both a single-phase liquid (water) and a dual-phase liquid/gas mixture (water/air). The experimental program consists of 27 tests utilizing a clear ejector representative of those employed in aerospace applications for measurement of pressure profile and specially designed for visualization of bubble and flow patterns. Motive fluid is supplied from 4.5 to 18 GPM and available fluid head is supplied from 3 to 9 inches of water above the secondary inlet. The analytical model extends previous models that describe single-phase performance from mass and energy conservation. The empirical loss coefficients are replaced by analytical equations accounting for the geometry of and flow conditions within the individual ejector components. The results show consistently better agreement with the experimental data than those delivered by existing models, reducing the root mean square error of the pressure recovery prediction to less than 10% of its former value.
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