Abstract
The interior of fluid coupling is full of turbulent and multi-scale vortex flow. The generation, development and interaction of the multi-scale vortex structure dominate the overall internal flow. Accurate identification of unsteady multi-scale vortex structure characteristics is extremely important for revealing the law of flow and the mechanism of energy conversion and loss mechanism. The flow field of fluid coupling under braking condition is numerically simulated based on the advanced turbulence model. The temporal and spatial evolution characteristics of the three-dimensional vortex structure inside the pump wheel and turbine are extracted based on different vortex recognition methods, and the results are compared with the flow field visualization test. The accuracy and applicability of the extraction results for different vortex recognition methods are analyzed. The results show that: the threshold selection of Q method extraction vortex structure is blind. It is difficult to capture both strong and weak vortices at the same time. Ω method can accurately capture the weak vortex structure within a large threshold range. Ω-Liutex method is not sensitive to threshold selection, and it is the most effective in extracting vortex structure. From the perspective of the temporal and spatial evolution of the three-dimensional vortex structure, Ω-Liutex method can reveal the mechanism of energy conversion and loss best.
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Funding
The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by the National Natural Science Foundation of China (grant no.52075212, 51405184), Scientific research project of Jilin Provincial Department of Education (grant no. JJKH20220977KJ), Free Exploration Project of the State Key Laboratory of Automotive Simulation and Control, Jilin University (grant no. ascl-zytsxm-202010), Funded by the special fund for the basic scientific research business expenses of the central colleges and universities of Chang'an University(grant no. 300102251511), and General Program of China Postdoctoral Science Foundation (grant no. 2018M641776).
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Chai, B., Yan, D., Zhang, J., Zuo, W., Wang, G. (2023). Three-Dimensional Vortex Structure Identification of Fluid Coupling and Analysis of Spatial-Temporal Evolution Mechanism. In: Wang, Y., Gao, Y., Liu, C. (eds) Liutex and Third Generation of Vortex Identification. Springer Proceedings in Physics, vol 288. Springer, Singapore. https://doi.org/10.1007/978-981-19-8955-1_12
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DOI: https://doi.org/10.1007/978-981-19-8955-1_12
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