3628 鈍い形状の列車先頭部がトンネルに突入する時に形成される圧縮波(S49-1 トンネルの空気力学と換気(1),S49 トンネルの空気力学と換気)  [in Japanese] 3628 On the compression wave generated when a blunt nose of a train enters a tunnel  [in Japanese]

The compression wave generated when a train of a blunt nose enters a single-track tunnel is examined by field measurement and model experiments. Field measurement was carried out for three different types of real trains traveling at about 120km/h on a conventional railway line, and model experiments for three varieties of rounded corners of the fronts of circular cylindrical trains entering a circular tube. It was found that the amplitudes and gradients of the compression waves generated by blunt-nosed fronts with flow separation are a few times larger than those by rounded-cornered ones without flow separation. The results of the field measurement are qualitatively consistent with those of the model experiments.