Acknowledgement
The authors acknowledge the experimental supports provided by the China Aerodynamics Research and Development Centre (CARDC). The authors are indebted to Zhixiang Huang and Li Chen for their invaluable and substantive counsel during the tests. This work was supported by the National Railway Administration of China (Grant No. 18T043), the National Railway Administration of China (Grant No. 2018Z035), and the Fundamental Research Funds for the Central Universities of Central South University (Grant No. 2021zzts0170 and No. 2021zzts0163).
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