基于相似理论的真空管道交通系统运行特性的研究

发布时间：2018-06-20 01:46

本文选题：真空管道交通系统 + 相似理论　；参考：《真空科学与技术学报》2015年09期

【摘要】：为了探索列车运行时真空管道交通(ETT)系统中热压耦合的气动特性,建立EET系统三维数学模型及物理模型,对系统的运行特性进行了仿真,结果表明:列车的最前端驻点处出现压力的最大值,车尾卡门涡街处出现压力的最小值。但由于该系统结构尺寸巨大,计算耗时长,工作量大,因此基于相似准则,结合ETT系统的运行特点,推导了ETT系统的相似准则方程,并在此基础上对系统的运行特性进行了研究,结果表明:在相似理论指导下,当小尺寸模型时,系统的压力场与原模型的压力场分布情况相似,最高和最低压力值仍然出现在列车的最前端驻点和车尾卡门涡街处,压力梯度变化云图相似,随着列车运行速度的增加压差呈抛物线式增长,最高温度同样呈抛物线式增长趋势,数值仿真结果与原模型尺寸的结果相比,压力场的最大相对误差为0.56%,温度场的最大相对误差为0.16%,均可以接受,因此在相似理论指导下,可以有效缩短ETT系统的数值计算周期。
[Abstract]:In order to explore the aerodynamic characteristics of the thermo-pressure coupling in the vacuum pipeline ETT system, a three-dimensional mathematical model and a physical model of the EET system are established, and the operation characteristics of the EET system are simulated. The results show that the maximum pressure appears at the stop point at the front end of the train and the minimum pressure at the Karman vortex street at the rear end of the train. However, due to its large structure size, long calculation time and heavy workload, the similarity criterion equation of ETT system is derived based on the similarity criterion and the operation characteristics of ETT system. On this basis, the operating characteristics of the system are studied. The results show that under the guidance of the similarity theory, the pressure field of the system is similar to that of the original model under the guidance of the small size model. The highest and lowest pressure values still appear at the front end of the train and the Karman vortex street. The change of pressure gradient is similar, and the pressure difference increases in parabola with the increase of train speed. The maximum temperature also shows a parabolic growth trend. Compared with the results of the original model, the maximum relative error of the pressure field is 0.56 and the maximum relative error of the temperature field is 0.160.The maximum relative error of the temperature field is acceptable, so under the guidance of the similarity theory, the maximum relative error of the pressure field is 0.56 and the maximum relative error of the temperature field is 0.16. The numerical calculation period of ETT system can be shortened effectively.
【作者单位】：青岛科技大学机电工程学院;
【基金】：国家自然科学基金项目(No.51206085)
【分类号】：U270.1;U171

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