Numerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters
In this study, the effects of the mixing chamber diameter (<i>D<sub>m</sub></i>), mixing chamber length (<i>L<sub>m</sub></i>) and pre-mixing chamber converging angle (<i>θ<sub>pm</sub></i>) were numerically investigated for a t...
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| Autores principales: | , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/9b978f6d10db4887b946622c266ec11f |
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| Sumario: | In this study, the effects of the mixing chamber diameter (<i>D<sub>m</sub></i>), mixing chamber length (<i>L<sub>m</sub></i>) and pre-mixing chamber converging angle (<i>θ<sub>pm</sub></i>) were numerically investigated for a two-throat nozzle ejector to be utilized in a CO<sub>2</sub> refrigeration cycle. The developed simulated method was validated by actual experimental data of a CO<sub>2</sub> 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 <i>D<sub>m</sub></i> in the range of 8–9 mm, <i>L<sub>m</sub></i> in the range of 64–82 mm and <i>θ<sub>pm</sub></i> 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. |
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