SIMULATION STUDY OF AERODYNAMIC FORCE FOR HIGH-SPEED MAGNETICALLY-LEVITATED TRAINS
Based on Reynolds average Navier-Storkes equations of viscous incompressible fluid and k-ε two equations turbulent model, the aerodynamic forces of high-speed magnetically-levitated(maglev) trains in transverse and longitudinal wind are investigated by finite volume method. Near 80 calculation cases for 2D transverse wind fields and 20 cases for 3D longitudinal wind fields are and lyzed. The aerodynamic side force, yawing, drag, lift and pitching moment for different types of maglev trains and a wheel/rail train are compared under the different wind speeds. The types of maglev train models for 2D transverse wind analysis included electromagnetic suspension (EMS) type train,electrodynamic suspension (EDS) type train, EMS type train with shelter wind wall in one side or two sides of guideway and the walls, which are in different height or/and different distances from train body. The situation of maglev train running on viaduct is also analyzed. For 3D longitudinal wind field analysis, the model with different sizes of air clearances beneath maglev train is examined for the different speeds. Calculation result shows that: ① Different transverse effects are shown in different types of maglev trains. ② The shelter wind wall can fairly decrease the transverse effect on the maglev train. ③ When the shelter wall height is 2 m, there is minimum side force on the train.When the shelter wall height is 2.5 m, there is minimum yawing moment on the train. ④ When the distance between inside surfaces of the walls and center of guideway is 4.0 m, there is minimum transverse influence on the train. ⑤ The size of air clearance beneath train body has a small influence on aerodynamic drag of the train, but has a fairly large effect on aerodynamic lift and pitching moment of the train. ⑥ The calculating lift and pitching moment for maglev train models are minus values.......
【作者名称】: LI Renxian
, LIU Yingqing
, ZHAI Wanming
【作者单位】: School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031, China
, School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031, China
, National Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031, China
【关 键 词】: Aerodynamic force
, Magnetically-levitated (maglev) train
, Numerical analysis
【上篇论文】: 中文期刊 - GIS-based risk analysis of debris flow: an application in Sichuan, southwest China
【下篇论文】: 中文期刊 - Effect of cypermethrin insecticide on the microbial community in cucumber phyllosphere
- 同期分轨多传声器录音的操控准则 (张杰)
- 肠道急性放射损伤机制及防治研究 Mechanisms of acute intestine injury by y-ray irradiaton and its therapy
BALB/c mice and human intestinal epithelial cells were irradiated to different doses by 60Co γ-rays. They were sampled for chromosome pattern analysis, intestinal morphology, and a number of other bio [γ-ray,Mice,Intestine,Intestinal epithelium stem cells,Exogenous ribonucleic acid]......
- Countercurrent chromatographic with upright multilayer coil plante centrifuge for large-scale preparation 一种用于大容量逆流色谱制备的立式多层螺旋管行星式离心机
Owing to no complications caused by solid supports, such as adsorptive sample loss and deactivation, tailing of solute peaks, and contamination, countercurrent chromatography (CCC) has been an area of [ountercurrent chromatography,Coil planet centrifuge,preparation]......
- Sustainable Development and Strategic Thinking
From an economic point of view, the industrial economy is efficient to overcome situations of a scarcity of goods. From a technological point of view, the resource efficiency of the manufacturing proc [sustainable development, circle economy]......
- APPLICATION OF HIGH-RESOLUTION MAGNETIC METHOD AND GRADIENT METHOD TO LOCATE ABANDONED BRINE-WELLS IN HUTCHINSON, KANSAS, U.S.A.
After successfully locating one abandoned brine well by an electromagnetic method during testing in 2001 and five abandoned brine wells by a high-resolution magnetic method during 2002, a high-resolut [High-resolution magnetic method,Magnetic gradient method,Brine Well]......
- Preliminary investigation on the role of microorganisms in the production of phosphine
The relationships between the phosphine content and various microbial populations, activities of different enzymes were investigated firstly. The results indicated that the phosphine content of sample [phosphane content,microbial populations,enzymatic activities,sulfate reducing bacteria,denitrifying bacteria]......
- Effect of heparin on high glucose induced proliferation and expression of matrix metalloproteinases in normal human mesangial cells
Background The pathogenesis of diabetic nephropathy (DN) is a complex pathophysiological process.Its precise mechanism is not fully known. In recent years it has been recognized that synthesis of vari [matrix metalloproteinases,normal human mesangial cell,glucose,heparin]......
- The forty years of vermicular graphite cast iron development in China
In China, the research and development of vermicular graphite cast iron (VGCI) as a new type of engineering material, were started in the same period as in other developed countries; however, its actu [vermicular graphite cast iron,China,review]......
- Research of optimization to solve nonlinear equation based on granular computing
In this article, a real number is defined as a granulation and the real space is transformed into real granu-lar space. In the entironment, solution of nonlinear equation is denoted by granulation [nonliear equation, granular compution, granular space]......