间缝式开口隧道缓冲结构气动特性分析
Seam opening tunnel buffer structure aerodynamic characteristic research

采用通用CFD工程分析软件，对高速列车突入有间缝式开口缓冲结构的隧道的空气动力学特性进行三维数值模拟。分析间缝式单、双开口缓冲结构的最优结构形式，采用模型试验和现场测试方法，对数值分析结果进行比较验证。研究结果显示：与常规既有的缓冲结构相比，间缝式开口缓冲结构对压力梯度的降低效率更高，经济性更好。从控制隧道出口微气压波的需要，提出应综合考虑单位米长降低率与总降低率，来选择缓冲结构的形式及参数。
Using CFD numeral simulation software，the efficiency of new type of tunnel hood, seam opening buffer structure, relieving train-tunnel aerodynamic effect was analyzed in 3-dimension model. The best structure parameter of single and double seam opening tunnel buffer structure was obtained. The calculation results were compared with experiment and field test results. The research results showed that comparing with other kind of hood structures, seam opening buffer structure has higher reduction efficiency of relief pressure gradient and better economy. It is proposed that both total reduction and reduction efficiency should be considered when selecting the form of the buffer structure