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On-line Access: 2024-08-27

Received: 2023-10-17

Revision Accepted: 2024-05-08

Crosschecked: 2024-07-24

Cited: 0

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Nianxun LI

https://orcid.org/0009-0006-4550-8280

Tian LI

https://orcid.org/0000-0002-7345-7488

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Journal of Zhejiang University SCIENCE A 2024 Vol.25 No.7 P.525-540

http://doi.org/10.1631/jzus.A2300301


Effect of streamlined nose length on aerodynamic performance of high-speed train with a speed of 400 km/h


Author(s):  Nianxun LI, Tian LI, Zhiyuan DAI, Deng QIN, Jiye ZHANG

Affiliation(s):  State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University,Chengdu610031,China

Corresponding email(s):   litian2008@home.swjtu.edu.cn

Key Words:  Streamlined nose length (SNL), High-speed train, Aerodynamic performance, Numerical simulation, Flow structures


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Nianxun LI, Tian LI, Zhiyuan DAI, Deng QIN, Jiye ZHANG. Effect of streamlined nose length on aerodynamic performance of high-speed train with a speed of 400 km/h[J]. Journal of Zhejiang University Science A, 2024, 25(7): 525-540.

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doi="10.1631/jzus.A2300301"
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%T Effect of streamlined nose length on aerodynamic performance of high-speed train with a speed of 400 km/h
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Abstract: 
The streamlined nose length (SNL) plays a crucial role in determining the aerodynamic performance of high-speed trains. An appropriate SNL can not only effectively reduce the magnitude of aerodynamic drag and lift forces, but also improve the performance of the high-speed train in tunnel passing and crosswind circumstances. In this study, a numerical simulation of the aerodynamic performance of high-speed trains at a speed of 400 km/h, with varying SNLs, is conducted using thek-ω shear stress transport (SST) turbulence model. The different SNLs include 6.0, 7.0, 8.0, 9.0, 9.8, 12.0, 15.0, and 18.0 m. In order to validate the accuracy of the numerical simulation, its results are compared with wind tunnel test data obtained from the literature. numerical simulation is carried out using compressible and incompressible gases to determine the effect of gas compressibility on results. The impact of SNL on the aerodynamic performance of the trains is analyzed in terms of aerodynamic forces, velocity, and pressure distributions. In comparison to the original train, the train with a 6.0 m SNL experienced a 10.8% increase in overall aerodynamic resistance. Additionally, the lift forces on the head and tail cars increased by 35.7% and 75.5%, respectively. On the other hand, the train with an 18.0 m SNL exhibited a 16.5% decrease in aerodynamic drag. Furthermore, the lift forces on the head and tail cars decreased by 21.9% and 49.7%, respectively. The aerodynamic drag force of the entire train varies linearly with the SNL, while the aerodynamic lift of the tail car follows a quadratic function in relation to the SNL.

流线型车头长度对400 km/h高速列车气动性能的影响

作者:李念勋,李田,戴志远,秦登,张继业
机构:西南交通大学,轨道交通运载系统全国重点实验室,中国成都,610031
目的:通过对时速400 km/h、具有不同流线型车头长度的高速列车的空气动力性能进行数值模拟,分析其流线型长度对高速列车气动性能的影响,以期为高速列车的头型优化提供建议和参考。
创新点:1.考虑空气的可压缩性,研究列车以时速400 km/h运行时的气动性能;2.分析列车的气动力变化规律,得到适用于流线型长度在6.0m到18.0m之间的列车的气动力拟合公式。
方法:1.通过将仿真结果与已有的风洞试验数据进行对比,验证数值模拟的可行性与准确性;2.将采用可压缩气体和不可压缩气体进行数值模拟的结果进行对比,验证采用可压缩气体进行数值仿真的准确性;3对列车的气动力、边界层及周围流场进行分析,得到流线型长度对列车气动性能的影响规律。
结论:1.分别采用可压缩和不可压缩气体进行数值模拟,得到头车阻力相对误差为4.50%,验证了本研究中使用可压缩气体进行列车气动性能数值模拟的可行性和合理性。2.随着流线型长度的增大,头车和尾车的气动阻力都有所减小,且头车向下的力和尾车向上的升力均有所减小。3.当流线型长度从9.8 m减小到6.0m时,列车的气动阻力增加了10.8%,且头车和尾车的升力分别增加了35.7%和75.5%;相反,当流线型长度从9.8 m增加到18.0m时,列车的气动阻力下降了16.5%,且头车和尾车升力分别下降了21.9%和49.7%。4.流线型长度和气动力之间的关系可以使用拟合公式来表示。

关键词:流线型车头长度;高速列车;空气动力学性能;数值模拟;流动结构

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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