Numerical Analysis Method for Dynamic Air Tightness Value of High-speed Train

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Numerical Analysis Method for Dynamic Air Tightness Value of High-speed Train

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[1]YIN Xiaochun,LU Yaohui,ZHAO Hongxing,et al.Numerical Analysis Method for Dynamic Air Tightness Value of High-speed Train[J].Journal of Zhengzhou University (Engineering Science),2022,43(05):52-58.[doi:10.13705/j.issn.1671-6833.2022.05.014]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 43卷 Number of periods: 2022 05 Page number: 52-58 Column: Public date: 2022-08-22

Title:: Numerical Analysis Method for Dynamic Air Tightness Value of High-speed Train

Author(s):: YIN Xiaochun; LU Yaohui; ZHAO Hongxing; SHI Xiaobo; TANG Bo; School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China

Keywords:: high-speed train; dynamic air tightness; numerical model; tunnel intersection; interior pressure

CLC:: U270. 1

DOI:: 10.13705/j.issn.1671-6833.2022.05.014

Abstract:: When high-speed trains pass through or meet in the tunnel, complex compression and expansion waves will be generated. As the carbody cannot be completely sealed, the pressure inside the carbody will follow the changes, causing uncomfort problems for passengers. By establishing a numerical analysis model of the inlet and outlet flow field of high-speed trains, and on the basis of calculating the pressure waves on the surface of the vehicle, the change law of the internal pressure was studied by using the equivalent leakage hole as the interface for the pressure transmission inside and outside of the vehicle. And the calculation method of the dynamic air tightness index of the high-speed train was proposed. Firstly, the effects of slenderness and position on the interior pressure in the modeling of equivalent leakage hole were compared, and the accurate numerical model of the interior and exterior flow field with equivalent leakage hole was determined. Then, the computational fluid dynamics (CFD) model of high-speed train-tunnel intersection was established, and the flow field of high-speed train tunnel intersection was calculated, and the surface pressure wave of train was obtained. Finally, the external surface pressure wave was used as the excitation of the internal and external flow field of the model to calculate the internal pressure change. After fitting the data, the internal pressure change rate and dynamic airtight index were analyzed, and compared with the measured data in the literature. The results showed that the calculation results with slenderness greater than 1∶4 were more reasonable for the modeling of equivalent leakage holes. In the numerical model of air tightness of single vehicle, the location of leakage hole had little effect on the internal pressure. Most of the external flow fields of the train meeting in tunnel were in a negative pressure state, and only the head measurement points have positive pressure. The dynamic air tightness analysis model proposed in this paper could better simulate the pressure fluctuation inside the vehicle. The simulation result of dynamic air tightness index during train passing tunnel in the condition of 7.05 cm2 equivalent leakage area and 1 000 m long tunnel was 66.3, which was approximately consistent with the literature results.

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Last Update: 2022-08-20