Wind Tunnel Tests on Aerodynamic Noise from the Head Car of a High-speed Train

2021 ◽  
pp. 163-176
Author(s):  
Hai Deng ◽  
Yigang Wang ◽  
Qiliang Li ◽  
Zhe Shen ◽  
Yang Gao ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
High Speed ◽  
Aerodynamic Noise ◽  
High Speed Train ◽  
Wind Tunnel Tests

scholarly journals Anechoic wind tunnel tests on high-speed train bogie aerodynamic noise

2016 ◽  
Vol 5 (2) ◽  
pp. 87-109 ◽  
Author(s):  
Eduardo Latorre Iglesias ◽  
David J. Thompson ◽  
Malcolm Smith ◽  
Toshiki Kitagawa ◽  
Nobuhiro Yamazaki
Keyword(s):  
Wind Tunnel ◽  
High Speed ◽  
Aerodynamic Noise ◽  
High Speed Train ◽  
Wind Tunnel Tests

Aerodynamic Coefficients of a High-Speed Train in Presence of Windbreaks With Different Gap Configurations

2020 ◽  
Author(s):  
Elia Brambilla ◽  
Gisella Tomasini ◽  
Stefano Giappino
Keyword(s):  
Wind Tunnel ◽  
High Speed ◽  
Full Scale ◽  
High Speed Train ◽  
European Standard ◽  
Aerodynamic Coefficients ◽  
Scaled Model ◽  
Wind Tunnel Tests ◽  
Cfd Analyses ◽  
High Band

Abstract In the present paper the force aerodynamic coefficients measured, according the European Standard Specifications, by means of wind tunnel tests carried out on a 1:15 scaled model of ETR1000 train in presence of different windbreaks configurations, are presented. In particular, 3m high band barriers (40% of porosity) have been tested with different gaps (from 0,5m to 30m, full scale) in the windbreaks and considering different positions of the train with respect to the gaps. The results shown in this paper allow to evaluate the effect of different windbreak parameters (gap amplitude, train position) on the train overturning risk and they represent a complete database for validation of CFD analyses.

scholarly journals Characteristics and Mechanism Analysis of Aerodynamic Noise Sources for High-Speed Train in Tunnel

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-19 ◽  
Author(s):  
Xiao-Ming Tan ◽  
Hui-fang Liu ◽  
Zhi-Gang Yang ◽  
Jie Zhang ◽  
Zhong-gang Wang ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Flow Field ◽  
Sound Source ◽  
High Speed ◽  
Spectral Characteristics ◽  
Oscillation Mode ◽  
Scale Model ◽  
Aerodynamic Noise ◽  
High Speed Train ◽  
Noise Sources

We aim to study the characteristics and mechanism of the aerodynamic noise sources for a high-speed train in a tunnel at the speeds of 50 m/s, 70 m/s, 83 m/s, and 97 m/s by means of the numerical wind tunnel model and the nonreflective boundary condition. First, the large eddy simulation model was used to simulate the fluctuating flow field around a 1/8 scale model of a high-speed train that consists of three connected vehicles with bogies in the tunnel. Next, the spectral characteristics of the aerodynamic noise source for the high-speed train were obtained by performing a Fourier transform on the fluctuating pressure. Finally, the mechanism of the aerodynamic noise was studied using the sound theory of cavity flow and the flow field structure. The results show that the spectrum pattern of the sound source energy presented broadband and multipeak characteristics for the high-speed train. The dominant distribution frequency range is from 100 Hz to 4 kHz for the high-speed train, accounting for approximately 95.1% of the total sound source energy. The peak frequencies are 400 Hz and 800 Hz. The sound source energy at 400 Hz and 800 Hz is primarily from the bogie cavities. The spectrum pattern of the sound source energy has frequency similarity for the bottom structure of the streamlined part of the head vehicle. The induced mode of the sound source energy is probably the dynamic oscillation mode of the cavity and the resonant oscillation mode of the cavity for the under-car structure at 400 Hz and 800 Hz, respectively. The numerical computation model was checked by the wind tunnel test results.

scholarly journals Structure Clearance Design in Wind Tunnel Tests with Implications for Aerodynamic Drag of High-Speed Trains

2021 ◽  
Author(s):  
Zhixiang Huang ◽  
Hanjie Huang ◽  
Weiping Zeng ◽  
Li Chen ◽  
Renyu Zhu
Keyword(s):  
Reynolds Number ◽  
Wind Tunnel ◽  
Drag Coefficient ◽  
Distribution Pattern ◽  
High Speed ◽  
Aerodynamic Drag ◽  
High Speed Train ◽  
Wind Tunnel Tests ◽  
High Speed Trains

Abstract The influences of vestibule diaphragm gap, wheel-rail clearance, and strut-plate gap on the aerodynamic drag of a 1/8th-scale high-speed train model were investigated in an 8 m×6 m wind tunnel. The Reynolds number was set to 2.2×106 based on train height. It was found that the variation of the vestibule diaphragm gap changed the aerodynamic drag distribution pattern of each car; the drag coefficient of the head and middle cars might change as high as 45%; however, the change in the drag coefficient of the total train was very small. The effects of the strut-plate gap on the aerodynamic drag of each car and the total train were small. The effect of the wheel-rail clearance on the drag of the head car was not significant. It was suggested that the vestibule diaphragm gap, strut-plate gap and wheel-rail clearance of the 1:8 scale high-speed train model should not be greater than 11, 10, and 9 mm, respectively.

scholarly journals Geometric Effects Analysis and Verification of V-Shaped Support Interference on Blended Wing Body Aircraft

2020 ◽  
Vol 10 (5) ◽  
pp. 1596
Author(s):  
Xin Xu ◽  
Qiang Li ◽  
Dawei Liu ◽  
Keming Cheng ◽  
Dehua Chen
Keyword(s):  
Wind Tunnel ◽  
High Speed ◽  
Pitching Moment ◽  
Straight Section ◽  
Test Results ◽  
Wind Tunnel Tests ◽  
Blended Wing Body ◽  
Support Interference ◽  
Geometric Effects ◽  
Good Agreement

A special V-shaped support for blended wing body aircraft was designed and applied in high-speed wind tunnel tests. In order to reduce the support interference and explore the design criteria of the V-shaped support, interference characteristics and geometric parameter effects of V-shaped support on blended wing body aircraft were numerically studied. According to the numerical results, the corresponding dummy V-shaped supports were designed and manufactured, and verification tests was conducted in a 2.4 m × 2.4 m transonic wind tunnel. The test results were in good agreement with the numerical simulation. Results indicated that pitching moment of blended wing body aircraft is quite sensitive to the V-shaped support geometric parameters, and the influence of the inflection angle is the most serious. To minimize the pitching moment interference, the straight-section diameter and inflection angle should be increased while the straight-section length should be shortened. The results could be used to design special V-shaped support for blended wing body aircraft in wind tunnel tests, reduce support interference, and improve the accuracy of test results.

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