高架桥声屏障高度对高速列车气动特性的影响.doc

高架桥声屏障高度对高速列车气动特性的影响.doc高架桥声屏障高度对高速列车气动特性的影响摘要:针对现代高速铁路建设中大量采用高架桥的现况,为保证列车安全、舒适、环保运行,给高速铁路建设工程提供参考数据,,不考虑横向风且列车运行速度为200km/,?拨拍P停?近壁处理采用非平衡壁面函数,,适当调小松弛因子,动量方程、k方程和ε方程采用1阶迎风格式;计算稳定后,再换用精度更高的2阶迎风格式,并适当调高松弛因子,,随着声屏障高度变化,作用在高速列车上的气动力和力矩表现出一定的规律性;没有横向风情况下,中间车的力和力矩因数对声屏障高度变化不敏感;声屏障高度变化对头、尾车的升力影响较大. 关键词:高速列车;气动特性;高架桥;声屏障;数值模拟;FLUENT 中图分类号:;:A Effectofviaductnoisebarrierheightonaerodynamic characteristicsofhighspeedtrain LUOJianbin1,2,YANGZhigang1 (,TongjiUniversity,Shanghai201804,China; ,GuangxiUniversityofTechnology,Liuzhou545006,Guangxi,China) Abstract:Astothefactthatviaductsarewidelyusedinthemodernhighspeedrailwayconstruction,haracteristicsofhighspeedtrainrunningonviaductisresearchedtoensurethesaferunning,?????拨?modelisselected,thenon??equilibriumwallfunctionisusedtodealwithnearwallregion,andSIMPLECalgorithmischosenforpressure??,therelaxationfactorsaredecreased,andthefirstorderupwindschemeisusedinmomentumequation,kequationandεequation;afterthecalculationisstable,;ifthecrosswindisnotconsidered,theeffectofnoisebarrierheightisnotobviousontheforceandmomentfactorsofthemiddletrain;thenoisebarrierheighthassignificanteffectonliftingforceontrainheadandrear. Keywords:highspeedtrain;haracte