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Jiang C.-W.,Beihang University | Zhang J.-B.,Beihang University | Guan X.-M.,CRS Erqi Rolling Stocks Corporation | Liao X.-P.,CRS Erqi Rolling Stocks Corporation | And 2 more authors.
Tiedao Xuebao/Journal of the China Railway Society | Year: 2011

The velocity profile of the atmospheric boundary layer was used for numerical study on the aerodynamic loads of container trains running at a speed of 120 km/h on a plain and under a crosswind of 8~12 Beaufort scale with a 90° wind angle. The objects of study were the computational models consisting of locomotives hauling 3 NX70 type flat cars and 3 X6K type flat cars respectively, both carrying 12.192 m(40 feet) containers. Research results indicate as follows: On plains, the average lift force acting on the 3 containers on the X6K type cars is about 25% of that acting on the containers on the NX70 type cars, side forces acting on containers of the same formation order are basically equal, and roll moments acting on the containers on the X6K type cars are about 60% of those acting on the containers on the NX70 type cars; for trains running on plains, the design of container cars has a strong effect on the lift force onto the container and a little effect on the side force onto the container; large-area spacing on the underframe of the container car is favorable to air flow between the container bottom and the car bottom, which reduces the lift force and roll moment onto the container effectively; rational design of container cars may improve the crosswind stability of the cars carrying containers while running on plains. Source


Jiang C.-W.,Beihang University | Chen Z.,Beihang University | Guan X.-M.,CRS Erqi Rolling Stocks Corporation | Liao X.-P.,CRS Erqi Rolling Stocks Corporation | And 2 more authors.
Tiedao Xuebao/Journal of the China Railway Society | Year: 2010

Aerodynamic loads of long formulation container trains running at a speed of 120 km/h on a plain under a crosswind of the 10 Beaufort scale with a 90° wind angle were studied numerically. The velocity profiles of the atmospheric boundary layer over a plain were used to simulate the working conditions of the trains to be studied. The train models of one locomotive hauling 2, 3, and 10 container cars respectively, and the periodic boundary models of trains formed of 1 and 3 container flat cars respectively were researched. The results indicate as follows: The lift of the container on the 1st car is weakened by the wake of the locomotive and the container on the 2nd car is subjected to the biggest lift; the yaw angles and side forces of the rear container cars are reduced in sequence by the wake of the front cars, and the side force acting on the container on the 1st car is the biggest; the roll moment of the container on the 2nd car is the biggest, and the roll moments of the containers on the front 3 cars are basically at the same level; upon reaching the utmost, the aerodynamic loads will decrease gradually with increasing of car number, and the aerodynamic load of the container on the last car will drop rapidly due to the wake around the last car. The periodic boundary models are used to simulate the aerodynamic loads of the middle segment of the long container train, the roll moments of which are 80%~84% of the utmost aerodynamic load of the whole train. Source

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