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Active Flow Control of a High-Speed Train Wake Using Synthetic Jets

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Abstract

To improve the aerodynamic performance of a high-speed train (HST) and reduce the safety risk of wake movement on platform commuters, trackside workers, and surrounding infrastructure, an active flow control method based on synthetic jets (SJs) is proposed to suppress the wake of the HST. The wake of the HST controlled by synthetic jets with different momentum coefficients is simulated by the improved delayed detached eddy simulation (IDDES) method embedded in ANSYS Fluent. Then, the slipstream velocity, aerodynamic force, velocity field in the wake region are analyzed. The results show that synthetic jets can effectively reduce the amplitude of the slipstream velocity in the wake region, the aerodynamic drag, and the fluctuation of the aerodynamic side force of the tail car. Furthermore, the synthetic jets delay the flow separation on the side of the tail car through periodic ejection and suction, and then attenuate the vortex motion in the wake region.

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Acknowledgements

The authors would like to acknowledge that the computer resources are provided by the School of Mechanical Engineering, Southwest Jiaotong University.

Funding

This work was supported by the National Natural Science Foundation of China (Grant Number [51975487]).

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Authors and Affiliations

  1. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, 610031, China

    Chunjun Chen & Dongwei Wang

  2. Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province, Chengdu, 610031, China

    Chunjun Chen

  3. Aerospace Technology Institute, China Aerodynamics Research and Development Center, Mianyang, 621000, China

    Dongwei Wang

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  1. Chunjun Chen
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  2. Dongwei Wang
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by CC and DW. The first draft of the manuscript was written by DW and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Dongwei Wang.

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Chen, C., Wang, D. Active Flow Control of a High-Speed Train Wake Using Synthetic Jets. Flow Turbulence Combust 111, 439–461 (2023). https://doi.org/10.1007/s10494-023-00447-w

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