新型高速列车隧道空气动力学模型实验系统

目前高速列车隧道空气动力学模型实验系统主要用于分析隧道内压力波的变化规律,难以对空气动力学效应进行完整的分析.针对这一局限性,从科特流(Couette)理论出发,提出了一种新型实验系统即旋转式高速列车—隧道模型实验系统,介绍了该系统的可行性、结构、实验原理及其特点.分析表明:该新型实验系统结构简单、功能完善、成本低、实验重复性好,适用于进行高速列车通过隧道时产生压力瞬变、微气压波、列车活塞风、行车阻力和气动噪声等一系列空气动力学实验,并能测量隧道内和列车隧道环形空间的气流速度场,对研究高速列车隧道空气动力学问题有重要意义.

A New Type of Model Experimental System of Aerodynamics Effects Caused by High-Speed Trains Passing Through Tunnel

The applied model experimental system is mainly used to analyze the changing rule of the pressure wave in tunnel, which is one of the aerodynamics effects when high_speed trains passing through the tunnel. It is difficult for the system to analyze the other aerodynamics effects. For this reason, the paper bases on the Couette flow theory to develop a new type of experimental system, Which is named the circular model experimental system of aerodynamics effects caused by high_speed trains passing through tunnel, and introduces its feasibilities, structure, experiment principle and specially characters. It is found that the new circular experimental system has a simple structure, powerful functions, lower cost and good repetitive performance, and can be used for a series of aerodynamics experiments on such as the changing rule of the pressure wave in tunnel, micro_pressure wave, piston wind of trains, resistance on trains and air noise. It can also measure the airflow velocity field in cylinder tunnel formed by the trains and tunnel. So, it will be of great value to the researches of the aerodynamics problems caused by high_speed trains passing through tunnel.