SIMULATION STUDY OF AERODYNAMIC FORCE FOR HIGH-SPEED MAGNETICALLY-LEVITATED TRAINS

来源 :Chinese Journal of Mechanical Engineering | 被引量 : 0次 | 上传用户:lq306330997
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Based on Reynolds average Navier-Storkes equations of viscous incompressible fluid and κ-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 analyzed. 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. Based on Reynolds average Navier-Storkes equations of viscous incompressible fluid and κ-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. Cases for 2D transverse wind fields and 20 cases for 3D longitudinal wind fields are analyzed. 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 substantial 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.
其他文献
北回归线以北的地区,任可一天中正午太阳高度最大,但不能为90°。学生对比是不容易接受的。如果画成下图,学生则认为正午太阳高度角一定为 60°,结果适得其反。我在教学实践
初中物理课本第二册关于对流的演示实验,是通过把高锰酸钾晶粒投放到盛水的烧瓶底部加热,使高锰酸钾溶液上升下降的现象来进行的。这个实验能观察的时间很短,往往在学生还来
190多万只中华绒螫蟹苗已经适应了异乡的“水土”,正在新疆天山地区生长。这是江苏省赣榆县农民张定文设在新疆的河蟹养殖基地传来的喜讯。将河蟹养殖技术优势向广袤的西部
读了《物理教学》87年第9期上发表的“浅谈初中电学教学中引入短路概念的必要和可能”一文,我们也有同感,并认为在初中电学教学中不讲短路,许多问题都说不清楚。借此机会我
园区概况:重庆电镀环保示范园是经重庆市环保局批准(环评批复号:渝环函[2012]508号)建设的为重庆璧山工业园唯一配套的电镀、表面处理集中加工区。占地近400亩,一期建设面积1
去年十月初,我调查了解了我省边远地区的16所中学(12所完全中学,4所初级中学)对《全日制中学物理教学大纲(中华人民共和国国家教育委员会制订)》(以下简称“大纲”)的使用和
为了改变武清县旧的水产养殖模式,1997年我们在武清县黄庄乡小营村李寿久承包的鱼塘中进行一年两茬养鱼试验,第一茬是成鱼养殖,第二茬是鱼种养殖。经过一年的养殖试验研究,
传统探捕甲鱼的办法有两种:一是铁叉探捕甲鱼;二是沿甲鱼“路”找甲鱼。前者易使甲鱼受伤,后者受水的浑浊度、水草多少制约。共同的缺点是捕获率低、劳动强度大、盲目性更大
本文对湖北首届网络小说大赛入围的20部中篇小说作了整体观照和个案评析。这些中篇主要包含了地域叙事、底层书写、战争题材和都市写真等不同的艺术形态。参赛的网络小说家们
喷泉鱼四川盆地周围山区河谷悬崖上飞泉挂银,终年不绝,每当春雨暴发泉眼涨水后飞泉中便涌出大量银鱼,蔚为壮观,当地称之为“鱼泉”。其中重庆市城口县前河、后河所流经的峡