本征正交分解在发动机缸内流场拟序结构研究中的应用*

doi:10.19562/j.chinasae.qcgc.2019.09.003

Automotive Engineering ›› 2019, Vol. 41 ›› Issue (9): 998-1005.doi: 10.19562/j.chinasae.qcgc.2019.09.003

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The Application of Proper Orthogonal Decomposition in the Researchof In-Cylinder Flow Field Coherent Structure

Qin Wenjin¹, Qi Guanchao¹, Wang Tao¹, Zhou Lei², Jia Ming³ & Xie Maozhao³

1.School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093;
2.Tianjin University, State Key Laboratory of Engines, Tianjin 300072;
3.School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024

Received:2018-07-11 Revised:2018-11-22 Online:2019-09-25 Published:2019-10-12

Abstract

Abstract: In this paper, large eddy simulation method is used to calculate 100 continuous cycle cold flow fields for a four-valve single-cylinder optical engine. The calculation results are verified by PIV experiments, and a reliable database is constructed for the study of the coherent structure of the turbulent flow field in the cylinder. Then, the orthogonal decomposition method is used to process the in-cylinder turbulent flow field database, and in-cylinder turbulent flow field is decomposed according to the vortex structure energy.The large scale coherent structures and small scale random vortices are effectively separated, which is benefit for studying the characteristic of different scale vortices. The calculation results also show that the intake jet in the intake stroke stage dominates the early overall flow pattern, and the resulting large-scale coherent structures are broken into small-scale vortices in the subsequent process, accompanied by the energy cascade phenomenon, and then the flow field gradually becomes isotropic

Key words: in-cylinder flow, large eddy simulation, proper orthogonal decomposition, coherent structure

Qin Wenjin, Qi Guanchao, Wang Tao, Zhou Lei, Jia Ming & Xie Maozhao. The Application of Proper Orthogonal Decomposition in the Researchof In-Cylinder Flow Field Coherent Structure[J].Automotive Engineering, 2019, 41(9): 998-1005.

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The Application of Proper Orthogonal Decomposition in the Researchof In-Cylinder Flow Field Coherent Structure

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