【摘要】 DF-9型机车及其改型的气动性能试验研究结果表明，机车前部形状是直接影响机车气动阻力大小的重要因素，同时，也影响双层客车的阻力系数。采用裙板等减阻措施，能够取得较好的减阻效果。更多还原

【Abstract】 Result of test research on aerodynamic behaviour of the DF-9 type locomotive engine and its retrofit proclaim, the leading shape of locomotive engine is an important foctor of af-fecting scale of the aerodynamic drag. Furthermore, it also affects the drag coefficient of the dou-bledecker carriage. Some methods of reducing drag, such as the apron etc, the drag can be reduced obviously.更多还原