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

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

本征正交分解在发动机缸内流场拟序结构研究中的应用^*

秦文瑾¹, 齐观超¹, 汪涛¹, 周磊², 贾明³, 解茂昭³

1.上海理工大学机械工程学院,上海 200093;
2.天津大学,内燃机燃烧学国家重点实验室,天津 300072;
3.大连理工大学能源与动力学院,大连 116024

收稿日期:2018-07-11 修回日期:2018-11-22 出版日期:2019-09-25 发布日期:2019-10-12
通讯作者: 秦文瑾,讲师,博士,E-mail:qinwenjin@usst.edu.cn
基金资助:
国家自然科学基金(51506118和91741119)资助

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

摘要/Abstract

摘要： 本文中应用大涡模拟方法对一台四气门单缸光学发动机进行了100个连续周期冷态流场计算,计算结果通过了PIV实验验证,为缸内湍流场拟序结构的研究构建了可靠的数据库。然后应用本征正交分解方法对缸内湍流场数据库进行了深度加工,根据湍流场涡团结构含能量进行分解,有效实现了大尺度拟序结构和小尺度随机脉动涡团的分离,为研究拟序结构和其他不同尺度涡团特性提供了便利。另外,计算结果还表明,进气冲程阶段的进气射流主导着缸内早期整体流动形态,产生的大尺度拟序结构涡团在随后的过程中不断破碎成小尺度涡团,并伴随着能量级联现象的发生,之后缸内流场会逐渐趋于各向同性。

关键词: 缸内流场, 大涡模拟, 本征正交分解, 拟序结构

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

秦文瑾, 齐观超, 汪涛, 周磊, 贾明, 解茂昭. 本征正交分解在发动机缸内流场拟序结构研究中的应用^*[J]. 汽车工程, 2019, 41(9): 998-1005.

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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本征正交分解在发动机缸内流场拟序结构研究中的应用^*

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

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