基于欧拉双流体模型,运用商用CFD软件FLUENT,对挟雨风条件下高速列车的气动特性和运行稳定性进行了三维模拟研究。分析了不同横摆角和暴雨强度下气动力和倾覆力矩的变化特征,并与无降雨条件下的相应结果进行比较。结果表明:受降雨影响,列车受到的阻力、侧向力和倾覆力矩均增大,列车气动性能损耗增加,运行稳定性降低。在模拟的降雨强度和横摆角条件下,阻力系数将提高1.8%~38.6%,侧向力系数提高0.1%~9.16%,导致列车的能耗增加;倾覆力矩系数提高1.8%~10.0%,意味着与净侧风相比,挟雨风进一步降低了列车的运行稳定性。
Effects of rain-loaded wind on the aerodynamic characteristics and running stability of a high-speed train were studied by numerical experiments in three dimensions using commercial CFD software (FLUENT). The variation in aerodynamic forces and rolling moment of the high-speed train were detected at different yaw angles with/without rain intensities. The results show that the rainfall increases the drag force, side force and rolling moment of the train, which makes its performance worse and running stability degraded. Under the conditions of simulated rain intensities and yaws, the coefficients of drag force increased by 1.8%-38.6% and 0.1%-9.16%, respectively, meaning a rise of power energy consumption of the train. The coefficient of rolling moment has a rise of 1.8%-10.0%, indicating a decrease of running stability of the train, if compared with that under only-cross-wind condition.
[1] 王艺淋,李振山,曾秋兰.高速铁路沿线短时大风预测方法[J].中国沙漠,2014,34(3):861-868.
[2] Bake C.The flow around high speed trains[J].Journal of Wind Engineering and Industrial Aerodynamics,2010,98(6):277-298.
[3] Suzuki M,Tanemoto K,Maeda T.Aerodynamic characteristics of train/vehicles under cross winds[J].Journal of Wind Engineering and Industrial Aerodynamics,2003,91(1):209-218.
[4] Cheli F,Ripamonti F,Rocchi D,et al.Aerodynamic behavior investigation of the new EMUV250 train to cross wind[J].Journal of Wind Engineering and Industrial Aerodynamics,2010,98(4):189-201.
[5] Imai T,Fujii T,Tanemoto K,et al.New train regulation method based on wind direction and velocity of natural wind against strong winds[J].Journal of Wind Engineering and Industrial Aerodynamics,2002,90(12):1601-1610.
[6] Hemida H,Krajnovic' S.LES study of the influence of the nose shape and yaw angles on flow structures around trains[J].Journal of Wind Engineering and Industrial Aerodynamics,2010,98(1):34-36.
[7] 林荣生,胡竞嵘,王厚雄,等.用风洞试验测定车辆的横风气动特性[J].铁道学报,1984,6(1):104-108.
[8] 任尊松,徐宇共,王璐雷,等.强侧风对高速列车运行安全性影响研究[J].铁道学报,2006,28(6):46-50.
[9] Baker C J.The simulation of unsteady aerodynamic cross wind forces on trains[J].Journal of Wind Engineering and Industrial Aerodynamics,2010,98(2):88-99.
[10] 马静,张杰,杨志刚.横风下高速列车非定常空气动力特性研究[J].铁道学报,2008,30(6):109-114.
[11] 杨志刚,马静,陈羽,等.横风中不同行驶工况下高速列车非定常空气动力特性[J].铁道学报,2010,32(2):18-23.
[12] Shao X M,Wan J,Chen D W,et al.Aerodynamic modeling and stability analysis of high-speed train under strong rain and crosswind conditions[J].Journal of Zhejiang University-SCIENCE A (Applied Physics and Engineering),2011,12(2):964-970.
[13] Chiu T W,Squire L.An experimental study of the flow over a train in a crosswind at large yaw angles up to 90°[J].Journal of Wind Engineering and Industrial Aerodynamics,1992,45(1):47-74.
[14] Hemida H,Krajnovic S.LES study of the influence of a train-nose shape on the flow structure under cross-wind conditions[J].Journal of Fluids Engineering,2008,130(9):1-12.
[15] Khier W,Breuer M,Durst F.Flow structure around trains under side wind conditions:A numerical study[J].Computers & Fluids,2000,29(2):179-195.
[16] Laws J O,Parsons D A.The relationship of raindrop size to intensity[J].Transactions on AGU,1943,24(2):452-460.
[17] Marshall J S,Palmer W M K.The distribution of raindrops with size[J].Journal of Meteorology,1948,5(4):165-166.
[18] Best A C.The size distribution of raindrops[J].Quarterly Journal of the Royal Meteorological Society,1950,76(32):16-36.
[19] Atlas D,Srivcastava R C,Sekhon R S.Doppler radar characteristics of precipitation at vertical incidence[J].Reviews of Geophysics,1973,11(1):1-35.
[20] Lovejoy S,Lilley M,Desaulniers-Soucy N,et al.Large particle number limit in rain[J].Physical Review E,2003,68(2),025301(R):1-4.
[21] 方丁酉.两相流动力学[M].长沙:国防科技大学出版社,1988.
[22] Sandberg P I.Driving rain distribution over an infinitely long high building:computerized calculations[C]//Second International CIB/RILEM Symposium on Moisture Problems in Buildings.Rotterdam,The Netherlands.1974:10-12.
[23] Bettle J,Holloway A G L,Venart J E S.A computational study of the aerodynamic forces acting on a tractor-trailer vehicle on a bridge in cross-wind [J].Wind Engineering and Industry Aerodynamics,2003,91(5):573-592.