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Numerical modeling on pumping performance of piccolo-tube multi-nozzles supersonic ejector in an oil radiator passage

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  • Shan, Yong
  • Zhang, Jing-zhou
  • Ren, Xiao-wen

Abstract

A special issue concerned in the current study is the supersonic ejector-based cooling system in an oil radiator air-cooled passage. To match the geometric feature of mixing chamber (variable sectional configuration with a big aspect ratio of cross section), a novel piccolo-tube multi-nozzles supersonic ejector is designed and numerically assessed. In the current 3-D numerical simulations, a simplified approach by utilizing an isotropic porous medium model is adopted for modeling the flow through a compact oil radiator. Simultaneously, a scaled-model experimental test is conducted for the purpose of validation. From a scaled-model test, it is suggested that the CFD simulation based on the porous medium approach is generally acceptable. In the presence of porous matrix, approximately 20%–40% decrease of the ejector pumping ratio is produced in relative to the situation without oil radiator, due to the flow resistance across the porous matrix. A conjunctive parameter considering the nozzle numbers, nozzle throat diameter, and piccolo-tube length is proposed. Either from the CFD-based analysis or from the scaled-model test, it is confirmed that there is an optimal conjunctive parameter for achieving the best ejector performance.

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  • Shan, Yong & Zhang, Jing-zhou & Ren, Xiao-wen, 2018. "Numerical modeling on pumping performance of piccolo-tube multi-nozzles supersonic ejector in an oil radiator passage," Energy, Elsevier, vol. 158(C), pages 216-227.
    • Handle: RePEc:eee:energy:v:158:y:2018:i:c:p:216-227
    DOI: 10.1016/j.energy.2018.06.001
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    References listed on IDEAS

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    1. Besagni, Giorgio, 2019. "Ejectors on the cutting edge: The past, the present and the perspective," Energy, Elsevier, vol. 170(C), pages 998-1003.

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