| 葛鹏辉，秦文瑾，李雪松，许敏，孔令逊.基于动态模态分解的缸内流场演变及动能分析[J].内燃机工程,2020,41(5):32-39. |
| Analysis on Kinetic Energy of In Cylinder Flow Evolution Using Dynamic Mode Decomposition |
| DOI：10.13949/j.cnki.nrjgc.2020.05.005 |
| Key Words:dynamic mode decomposition particle image velocimetry(PIV) multi scale flow structures in cylinder flow |
| Author Name | Affiliation | | GE Penghui, QIN Wenjin, LI Xuesong, XU Min, HUNG David Ling Shun | 1.University of Michigan Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China
2.School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200240, China
3.School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract:The high speed particle image velocimetry(PIV) was used to measure the in cylinder flow fields of a gasoline direct injection optical engine under motoring conditions. The dynamic mode decomposition(DMD) algorithm was used to extract the multi scale flow structures from early intake stroke to late compression stroke. The decay process of specific kinetic energy of the multi scale flow structures during both strokes was quantified. The results showed that from the early stage of the intake stroke, the in cylinder flow fields were mainly composed of large scale flow structures represented by low order DMD modes and small scale vortex structures represented by high order DMD modes. The variations of specific kinetic energy of DMD modes could clearly reflect the energy cascade and dissipation processes from the large scale flow structures to the small scale vortex structures. Compared with the compression stroke, the in cylinder flow fields during the intake stroke showed a faster energy decay process with more small scale vortex structures. The energy decay of the intake stroke was more sensitive to engine speed. |
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