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Jacquet_45631300_2018.pdf
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- Abstract
- Supersonic ejectors have many applications : aeronautic, refrigeration cycles, etc. Their main advantage lies in the lack of mobile mechanical pieces, making it easier to operate and to maintain. Furthermore, ejector are quite promising, on an energetic point of vue, consuming less energy than other alternatives. Many researches have been led in order to best characterize ejectors. However, the addition of a pulsation in the primary stream was never much investigated. This thesis aims to develop a numerical simulation of a pulsed supersonic ejector and to study its effects. The first part of this work includes the set up of the model : equations at stake, computationnal domain, etc., as well as a validation of the obtained results. Then, the results from the numerical simulation of the pulsed ejector are presented. The introduction of a pressure pulsation in the primary stream does not show an increase in the entrainment ratio for small frequencies and amplitudes. Concerning high frequencies and amplitudes, a slight increase of entrainment ratio was observed, but is accompanied by backflow at the primary inlet. The consequence of those backflows on the performances are not yet determined.