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

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

Energy, 2018, vol. 158, issue C, 216-227

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.

Keywords: Oil radiator air-cooled passage; Ejector; Piccolo-tube nozzle; Porous medium model; Scaled model test (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:158:y:2018:i:c:p:216-227

DOI: 10.1016/j.energy.2018.06.001

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