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

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: Fatong Jia, Dazhang Yang, Jing Xie
Formato: article
Lenguaje:EN
Publicado: MDPI AG 2021
Materias:
ejector
entrainment ratio
two-throat nozzle
refrigeration
CFD simulation
CO<sub>2</sub>
Technology
T
Acceso en línea:https://doaj.org/article/9b978f6d10db4887b946622c266ec11f
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spelling oai:doaj.org-article:9b978f6d10db4887b946622c266ec11f2021-11-11T15:44:27ZNumerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters10.3390/en142169001996-1073https://doaj.org/article/9b978f6d10db4887b946622c266ec11f2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/6900https://doaj.org/toc/1996-1073In 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.Fatong JiaDazhang YangJing XieMDPI AGarticleejectorentrainment ratiotwo-throat nozzlerefrigerationCFD simulationCO<sub>2</sub>TechnologyTENEnergies, Vol 14, Iss 6900, p 6900 (2021)
institution DOAJ
collection DOAJ
language EN
topic ejector
entrainment ratio
two-throat nozzle
refrigeration
CFD simulation
CO<sub>2</sub>
Technology
T
spellingShingle ejector
entrainment ratio
two-throat nozzle
refrigeration
CFD simulation
CO<sub>2</sub>
Technology
T
Fatong Jia
Dazhang Yang
Jing Xie
Numerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters
description 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.
format article
author Fatong Jia
Dazhang Yang
Jing Xie
author_facet Fatong Jia
Dazhang Yang
Jing Xie
author_sort Fatong Jia
title Numerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters
title_short Numerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters
title_full Numerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters
title_fullStr Numerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters
title_full_unstemmed Numerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters
title_sort numerical investigation on the performance of two-throat nozzle ejectors with different mixing chamber structural parameters
publisher MDPI AG
publishDate 2021
url https://doaj.org/article/9b978f6d10db4887b946622c266ec11f
work_keys_str_mv AT fatongjia numericalinvestigationontheperformanceoftwothroatnozzleejectorswithdifferentmixingchamberstructuralparameters
AT dazhangyang numericalinvestigationontheperformanceoftwothroatnozzleejectorswithdifferentmixingchamberstructuralparameters
AT jingxie numericalinvestigationontheperformanceoftwothroatnozzleejectorswithdifferentmixingchamberstructuralparameters
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