NUMERICAL STUDY OF THE INITIAL PRESSURE AND DIAMETERS RATIO EFFECT ON THE JET EJECTOR PERFORMANCE

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  Sadoun Fahad Dahkil   |      Tahseen Ali Gabbar   |      Dhamia Khalf Jaber   |   

In this paper, the computation fluid dynamics model (CFD ) is used to simulate a turbulence flow field along with the jet ejector. A Steady-state 2-D compressible flow model utilities the standard k-ε turbulent model has been used. The performance of the jet ejector is simulated by FLUENT 6.3 (code) and GAMBIT software, using the finite-volume scheme to solve transport NAVIER STOKE equations. The objective of this study is to investigate the high-performance jet ejector geometry ( mass flow and head ratio) nozzle to throat diameter at eight cases (DN/DT) with different initial pressure. Research is performed to optimize jet performance by varying initial pressure and nozzle diameter ratios from (1/8 ) to ( 8/8 ). To increase understanding of the axial velocity distribution at important regions along with the ejector, three regions are chosen, at the inlet (1,3), nozzle exit (2), and the midpoint of the throat (4), with an important different diameters ratio cases 1,2,3,5,7 and 8 respectively. The comparison of these results is presented by the axial velocity magnitude, mass, and head ratio of the ejector in the above cases. Results show that higher pressure ratio and mass ratio (high performance) occur when the nozzle to throat diameter ratio (DN/DT) was (5/8) and (1/8) respectively. Also, the mass ratio is decreased at all initial pressure when the diameter ratio increased.