Distribution and unsteady characteristics of the temperature and pressure loads acting on the car-body in evacuated tube maglev transport

HU Xiao; MA Tianhao; WANG Xiaofei; DENG Zigang; ZHANG Jiwang; ZHANG Weihua

doi:10.11729/syltlx20220084

Volume 37 Issue 1

Feb. 2023

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HU X, MA T H, WANG X F, et al. Distribution and unsteady characteristics of the temperature and pressure loads acting on the car-body in evacuated tube maglev transport[J]. Journal of Experiments in Fluid Mechanics, 2023, 37(1): 9-28 doi: 10.11729/syltlx20220084

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Distribution and unsteady characteristics of the temperature and pressure loads acting on the car-body in evacuated tube maglev transport

doi: 10.11729/syltlx20220084

HU Xiao^{1, 2
,},
MA Tianhao¹,
WANG Xiaofei³,
DENG Zigang^{1, 2
,
,},
ZHANG Jiwang¹,
ZHANG Weihua^{1, 2}

1.
State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu　610031, China
2.
Research Center for Super-High-Speed Evacuated Tube Maglev Transport, Southwest Jiaotong University, Chengdu　610031, China
3.
School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu　610031, China

Received Date: 2022-08-22
Accepted Date: 2022-09-05
Rev Recd Date: 2022-08-30

Available Online: 2022-11-15

Publish Date: 2023-02-25

Abstract

Abstract

Based on the SST $k-\omega$ turbulence model and the IDDES method, a three-dimensional numerical model was used to simulate the transient state of an evacuated tube maglev transport system at 800 km/h in the choked (blockage ratio of 0.3 and 0.2) and unchoked (blockage ratio of 0.1) states. The accuracy of the numerical method was verified using transonic wind tunnel bump test data. Additionally, the significant coherent structure of the flow field was extracted based on the proper orthogonal decomposition, the region with the strong unsteady load on the train surface was identified, and its space-time evolution law was revealed. The results show that the load distribution on the upper surface of the train is similar to that of the Laval nozzle, and the difference in load distribution between the chocked/unchoked conditions is mainly in the divergent section. The load distribution on the lower surface of the train becomes complex due to the abrupt change in the cross-section of the bogie cavity. The difference in the interaction between the upwash and downwash flow leads to different locations of the temperature peaks under the choked/unchoked conditions. The strong unsteady pressure region on the train surface is mainly located at the bottom bogie and has a characteristic frequency of 14 Hz. The tail car shock wave is also an unsteady source under choked conditions. The first-order modes of the middle and tail car temperature loads reflect the heat accumulation process.
- evacuated tube,
- choking effects,
- unsteady,
- temperature and pressure loads,
- proper orthogonal decomposition

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References(41)

References

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