CAJ | 학술논문

为了将地铁瞬变压力的波动控制在人体舒适度范围内，根据三维不可压缩Navier-Stokes方程和标准k -ε紊流模型，以22．73 m2的地铁区间矩形隧道为研究对象，建立隧道-列车-空气数值模型，分析地铁隧道中列车特征部位压力和压力梯度的变化规律和影响因素。研究结果表明：列车运行速度超过100 km/h后，有必要在地铁入口处设置缓冲结构；缓冲结构降低压力最大值的效果并不显著，但降低压力梯度最大值的效果显著；喇叭型缓冲结构是优选的地铁入口降压措施；缓冲结构的最佳长度为2倍隧道水力直径；缓冲结构的横断面积越大，其降压效果越好；缓冲结构的最佳开孔率为30％左右。
위료장지철순변압력적파동공제재인체서괄도범위내，근거삼유불가압축Navier-Stokes방정화표준k -ε문류모형，이22．73 m2적지철구간구형수도위연구대상，건립수도-열차-공기수치모형，분석지철수도중열차특정부위압력화압력제도적변화규률화영향인소。연구결과표명：열차운행속도초과100 km/h후，유필요재지철입구처설치완충결구；완충결구강저압력최대치적효과병불현저，단강저압력제도최대치적효과현저；나팔형완충결구시우선적지철입구강압조시；완충결구적최가장도위2배수도수력직경；완충결구적횡단면적월대，기강압효과월호；완충결구적최가개공솔위30％좌우。
In order to control subway transient pressure ’s fluctuation within the evaluation standard of human comfort,the 22.73 m2 subway rectangular tunnel was investigated according to the three -dimensional incom-pressible Navier-Stokes equations and the standard k-εturbulence model,and a tunnel-train-air simulation model was developed,by which a thorough study was conducted on change laws and influencing factors of pres-sure and pressure gradient on train body characteristic sections in subway.The results show that when the train’ s speed is larger than 100 km/h,it is necessary to build the buffer structure at subway inlet,and the buffer structure can reduce the maximum pressure gradient effectively,while its effect on lowering the maximum pres-sure is non-significant.The horn buffer structure is the optimization form of antihypertensive measures at the subway entrance,and the best length of buffer structure is 2 times the diameter of tunnel hydraulic diameter. Thereinto,the larger the cross sectional area of buffer structure,the better its antihypertensive effect.It can also be found from the research that the best open porosity of buffer structure is about 30%.