Numerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters

Fatong Jia, Dazhang Yang and Jing Xie
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Fatong Jia: College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China
Dazhang Yang: College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China
Jing Xie: College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China

Energies, 2021, vol. 14, issue 21, 1-16

Abstract: In this study, the effects of the mixing chamber diameter ( D m ), mixing chamber length ( L m ) and pre-mixing chamber converging angle ( θ pm ) were numerically investigated for a two-throat nozzle ejector to be utilized in a CO 2 refrigeration cycle. The developed simulated method was validated by actual experimental data of a CO 2 ejector in heat pump water heater system from the published literature. The main results revealed that the two-throat nozzle ejectors can obtain better performance with D m in the range of 8–9 mm, L m in the range of 64–82 mm and θ pm at approximately 60°, respectively. Deviation from its optimal value could lead to a poor operational performance. Therefore, the mixing chamber structural parameters should be designed at the scope around its optimal value to guarantee the two-throat nozzle ejector performance. The following research can be developed around the two-throat nozzle geometries to strengthen the ejector performance.

Keywords: ejector; entrainment ratio; two-throat nozzle; refrigeration; CFD simulation; CO 2 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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