Abstract
In this study, a CFD-based shape optimisation of a two-phase R744 ejector was performed. The investigated
device is to be installed in a refrigeration system of supermarkets located in two different ambient conditions.
To simulate the carbon dioxide flow through the ejector, an appropriate CFD tool was developed. The
applied mathematical model was based on the HEM approach. The CFD tool was controlled with the inhouse
script to automatically setup the model, run the computations and post-process the obtained results.
This tool was combined with the optimisation procedure for refinement of the selected parts of the ejector
geometry. The objective function was formulated to maximise the total ejector efficiency. Each ejector shape
was computed for two operating regimes. The optimisation results showed the increase of the ejector
performance comparing to the basic geometry. However, not for all the operating regimes the ejector
performance improvement was obtained.
device is to be installed in a refrigeration system of supermarkets located in two different ambient conditions.
To simulate the carbon dioxide flow through the ejector, an appropriate CFD tool was developed. The
applied mathematical model was based on the HEM approach. The CFD tool was controlled with the inhouse
script to automatically setup the model, run the computations and post-process the obtained results.
This tool was combined with the optimisation procedure for refinement of the selected parts of the ejector
geometry. The objective function was formulated to maximise the total ejector efficiency. Each ejector shape
was computed for two operating regimes. The optimisation results showed the increase of the ejector
performance comparing to the basic geometry. However, not for all the operating regimes the ejector
performance improvement was obtained.
