scholarly journals Aerodynamic characteristics of high speed train under turbulent cross winds: A numerical investigation using unsteady-RANS method

2014 ◽  
Vol 42 (1) ◽  
pp. 10-18 ◽  
Author(s):  
Asress Biadgo ◽  
Aleksandar Simonovic ◽  
Jelena Svorcan ◽  
Slobodan Stupar
Keyword(s):  
Numerical Investigation ◽  
High Speed ◽  
Aerodynamic Characteristics ◽  
High Speed Train ◽  
Unsteady Rans ◽  
Rans Method

scholarly journals Numerical Investigation of Aerodynamic Characteristics of High Speed Train

2017 ◽  
Vol 184 ◽  
pp. 012015
Author(s):  
J.S. Mohamed Ali ◽  
Ashraf Ali Omar ◽  
Muhammad ‘Atif B. Ali ◽  
Abdul Rahman Bin Mohd Baseair
Keyword(s):  
Numerical Investigation ◽  
High Speed ◽  
Aerodynamic Characteristics ◽  
High Speed Train

The Aerodynamic Characteristics of the Pantograph When the Train Passes Through the Tunnel

2017 ◽  
Author(s):  
Dilong Guo ◽  
Wen Liu ◽  
Junhao Song ◽  
Ye Zhang ◽  
Guowei Yang
Keyword(s):  
High Speed ◽  
Aerodynamic Force ◽  
Maximum Amplitude ◽  
Aerodynamic Characteristics ◽  
High Speed Train ◽  
Expansion Waves ◽  
Compression And Expansion ◽  
High Speed Trains ◽  
Current Characteristics ◽  
Pass Through

The aerodynamic force acting on the pantograph by the airflow is obviously unsteady and has a certain vibration frequency and amplitude, while the high-speed train passes through the tunnel. In addition to the unsteady behavior in the open-air operation, the compressive and expansion waves in the tunnel will be generated due to the influence of the blocking ratio. The propagation of the compression and expansion waves in the tunnel will affect the pantograph pressure distribution and cause the pantograph stress state to change significantly, which affects the current characteristics of the pantograph. In this paper, the aerodynamic force of the pantograph is studied with the method of the IDDES combined with overset grid technique when high speed train passes through the tunnel. The results show that the aerodynamic force of the pantograph is subjected to violent oscillations when the pantograph passes through the tunnel, especially at the entrance of the tunnel, the exit of the tunnel and the expansion wave passing through the pantograph. The changes of the pantograph aerodynamic force can reach a maximum amplitude of 106%. When high-speed trains pass through tunnels at different speeds, the aerodynamic coefficients of the pantographs are roughly the same.

scholarly journals Numerical Investigation of the Deposition Characteristics of Snow on the Bogie of a High-Speed Train

2020 ◽  
Vol 16 (1) ◽  
pp. 41-53
Author(s):  
Lu Cai ◽  
Zhen Lou ◽  
Nan Liu ◽  
Chao An ◽  
Jiye Zhang
Keyword(s):  
Numerical Investigation ◽  
High Speed ◽  
High Speed Train

Aerodynamic Characteristics Analysis of High-Speed Train on Cutting under Crosswinds

2013 ◽  
Vol 300-301 ◽  
pp. 62-67
Author(s):  
Kun Ye ◽  
Ren Xian Li
Keyword(s):  
High Speed ◽  
Three Dimensional ◽  
Aerodynamic Characteristics ◽  
High Speed Train ◽  
Aerodynamic Forces ◽  
Cutting Depth ◽  
Cutting Slope ◽  
Characteristics Analysis ◽  
Relationship Of ◽  
The Relationship

Cutting is an effective device to reduce crosswind loads acting on trains. The cutting depth, width and gradient of slope are important factors for design and construction of cutting. Based on numerical analysis methods of three-dimensional viscous incompressible aerodynamics equations, aerodynamic side forces and yawing moments acting on the high-speed train, with different depths and widths of cutting，are calculated and analyzed under crosswinds，meanwhile the relationship of the gradient of cutting slope and transverse aerodynamic forces acting on trains are also studied. Simulation results show that aerodynamic side forces and yawing moments acting on the train（the first, middle and rear train）decrease with the increase of cutting depth. The relationship between transverse forces (moments) coefficients acting on the three sections and the cutting depth basically is the three cubed relation. The bigger is cutting width，the worse is running stability of train. The relationship between yawing moments coefficients acting each body of the train and the cutting width approximately is the three cubed relation. The transverse Aerodynamic forces decreased gradually with the increase of the gradient of cutting slope, the relationship between yawing moments coefficients acting each body of the train and the gradient of cutting slope basically is the four cubed relation.

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