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• W4290794622 abstract "• A single-phase supersonic ejector working with R245fa is considered. • Advanced numerical modeling is favorably compared to experimental data. • A movable needle is used to control the throat area in the primary nozzle. • Two needle geometries are tested over a large range of operating conditions. • The maximum transiting exergy efficiency is less than 35% in all conditions. Vapor ejectors raise interest for cooling applications given their low electrical consumption, however, a single ejector suffers from a lack of capacity flexibility. The current study explores the use of an adjustable needle to control the primary nozzle throat area ( A t ) in view to allow variable ejector capacity. Tests were done using a large scale test bench working with the refrigerant R245fa. CFD simulations using k- ω SST and, for the first time, Scale-Adaptive Simulation (SAS), were also done. A comparison of the simulation results using the two different turbulence models ( ω SST and SAS) showed negligible difference. Also, the simulation results with the ω SST model showed good agreement with the experimental values. For fixed operating conditions, the simulation showed that the reduction of the throat area from 1.00 A t to 0.61 A t increased the entrainment ratio from 24% to 56%, but reduced the critical outlet pressure from 440 kPa to 315 kPa. For all conditions, the transiting exergy efficiency η t r , e x first increased with the increase of the outlet pressure ( P o u t ), reached a maximum value when Pout is close to the critical outlet pressure ( P c r i t ), and then decreased sharply due to the decrease of the entrainment ratio. Finally, CFD modelings with a blunt tip needle to see the effect of the needle geometry and in order to have a lower throat area value of 0.39 A t . This novel study shows that the ejector equipped with a needle is able to maintain ejector performance with changes in operating conditions." @default.
• W4290794622 created "2022-08-09" @default.
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• W4290794622 date "2022-12-01" @default.
• W4290794622 modified "2023-09-27" @default.
• W4290794622 title "Experimental and numerical studies on the use of a needle for variable capacity single-phase ejectors" @default.
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• W4290794622 doi "https://doi.org/10.1016/j.ijrefrig.2022.08.004" @default.
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