Yang Mingzhi, Du Juntao, Li Zhiwei, Huang Sha, Zhou Dan
Key Laboratory of Rail Traffic Safety (Central South University), Ministry of Education, Changsha, Hunan Province, China.
CRRC QINGDAO SIFANG CO., LTD, Qingdao, Shandong Province, China.
PLoS One. 2017 Jan 17;12(1):e0169471. doi: 10.1371/journal.pone.0169471. eCollection 2017.
A moving model test method based on stagnation pressure measurements is proposed to measure the train aerodynamic drag coefficient. Because the front tip of a high-speed train has a high pressure area and because a stagnation point occurs in the center of this region, the pressure of the stagnation point is equal to the dynamic pressure of the sensor tube based on the obtained train velocity. The first derivation of the train velocity is taken to calculate the acceleration of the train model ejected by the moving model system without additional power. According to Newton's second law, the aerodynamic drag coefficient can be resolved through many tests at different train speeds selected within a relatively narrow range. Comparisons are conducted with wind tunnel tests and numerical simulations, and good agreement is obtained, with differences of less than 6.1%. Therefore, the moving model test method proposed in this paper is feasible and reliable.
提出了一种基于驻点压力测量的动模型试验方法来测量列车空气动力学阻力系数。由于高速列车的前端有一个高压区域，且在该区域中心会出现一个驻点，基于测得的列车速度，驻点压力等于传感管的动压。对列车速度进行一阶求导，以计算由无额外动力的动模型系统弹出的列车模型的加速度。根据牛顿第二定律，通过在相对较窄范围内选择的不同列车速度下进行多次试验，可以求解空气动力学阻力系数。与风洞试验和数值模拟进行了比较，结果吻合良好，差异小于6.1%。因此，本文提出的动模型试验方法是可行且可靠的。
