OPTIMIZATION OF AN EJECTOR USING COMPUTATIONAL FLUID DYNAMICS

摘要

The modelling of ejectors has traditionally been done usinga control volume approach. That is, the conservation equationsare solved globally to predict the overall performance of theejector. This approach is very useful to evaluate variations inthe performance resulting from flow changes but cannot beused effectively to seek the geometry leading to optimumperformance.In the last decade, rapid advances have occurred in computercapabilities and CFD algorithms. The objective of this workwas to assess the ability of a modern, state-of-the-art CFD codein the modelling of a cascaded ejector. More specifically, acomputational and experimental study was completed using avariable geometry ejector and a finite volume CFD code tocompare the CFD predictions to experimental results. It wasfound that all trends observed in the experiment were alsopresent in the simulation, although the quantitative results weresometimes different. The optimum geometry as predicted byCFD simulations was similar to the optimum geometry whichwas found experimentally.