单列列车通过无辅助坑道长大铁路隧道时空气阻力计算方法研究

对单列列车通过无辅助坑道长大铁路隧道时的空气阻力计算方法进行探讨，建立基于非恒定流和车头车尾压差的空气阻力计算公式，在通过现场试验对此方法进行验证后进行大量工况的计算，分析隧道长度、阻塞比、列车速度和列车长度对列车空气阻力的影响。计算结果表明：影响隧道内列车空气阻力最主要的因素是列车速度，其次分别为阻塞比、隧道和列车长度。

Study on Method to Calculate Air Resistance Caused by Single Train Running through Long Railway Tunnels without Auxiliary adit

The method to calculate the air resistance caused by a single train running through long railway tunnels without auxiliary adit is discussed.A method to calculate the air resistance is established on basis of the unsteady flow and the pressure difference between the train nose and the train tail.The calculation method is verified by field trials and a lot of calculations are made for different train running conditions.The influences of the tunnel length,train-tunnel dimension ratio,train speed and train length on the air resistance is analyzed.The calculation results show that the factor that has the greatest influence on the air resistance is the train-tunnel dimension ratio,which is followed by train speed,tunnel length and train length.