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	Analysis of the high-speed jet in a liquid-ring pump ejector using a proper orthogonal decomposition method
	Jiang, Li-Jie1; Zhang, Ren-Hui1,2; Chen, Xue-Bing1; Guo, Guang-Qiang1,2
Source	ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
	2022-12-31
Volume	16Issue:1Pages:1382-1394
Keyword	Liquid-ring pump ejector POD LES shock wave reduced order model
ISSN	1994-2060
DOI	10.1080/19942060.2022.2089733
English Abstract	To analyze the complex spatiotemporal evolution law of the high-speed jet flow field in a liquid-ring pump ejector, both the classic and spectral proper orthogonal decomposition (SPOD) methods were introduced to decompose the transient flow field based on the numerical large eddy simulation. The proper orthogonal decomposition (POD) reduced order model (ROM) of the complex flow in the ejector was established to analyze the transient characteristics and reconstruct the flow field. The spatial mode characteristics of density, pressure and vorticity field, and the frequency domain characteristics of mode coefficients were analyzed. The results show that the spatiotemporal decoupling analysis of a high-speed jet flow field can be accomplished by the POD and SPOD methods. A large-scale symmetric coherent structure is formed in the shear layer of the first two modes of vorticity, and a small-scale antisymmetric structure is formed at the trailing edge of the jet flow for the third and fourth modes. This reflects the evolutionary characteristics of the jet shear vortex. There is a significant spatial correlation between the density and pressure modes, reflecting that the evolution of the two structures has important correlation characteristics. The spectral analysis of the mode coefficients shows that the dominant frequencies of 1250 Hz and 18 kHz correspond to the self-excited oscillation frequency of shock waves and the vortex shedding frequency. The POD-ROM can reconstruct the high-speed flow field of the ejector with enough accuracy using the first 30-order modes, and the root mean square error and mean absolute percentage error for the velocity prediction are 0.48% and 0.24%, respectively.
WOS Research Area	Engineering ; Mechanics
Language	英语
Publisher	TAYLOR & FRANCIS LTD
WOS ID	WOS:000821351200001
Content Type	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158871]
Collection	能源与动力工程学院
Affiliation	1.Lanzhou Univ Technol, Sch Energy & Power Engn, Lanzhou, Peoples R China; 2.Key Lab Fluid Machinery & Syst, Lanzhou, Peoples R China
Recommended Citation GB/T 7714	Jiang, Li-Jie,Zhang, Ren-Hui,Chen, Xue-Bing,et al. Analysis of the high-speed jet in a liquid-ring pump ejector using a proper orthogonal decomposition method[J]. ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS,2022,16(1):1382-1394.
APA	Jiang, Li-Jie,Zhang, Ren-Hui,Chen, Xue-Bing,&Guo, Guang-Qiang.(2022).Analysis of the high-speed jet in a liquid-ring pump ejector using a proper orthogonal decomposition method.ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS,16(1),1382-1394.
MLA	Jiang, Li-Jie,et al."Analysis of the high-speed jet in a liquid-ring pump ejector using a proper orthogonal decomposition method".ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS 16.1(2022):1382-1394.

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