Mitigation Effect of Helmholtz Resonator on the Micro-Pressure Wave Amplitude of a 600-km/h Maglev Train Tunnel

A 600-km/h maglev train can effectively close the speed gap between civil aviation and rail-based trains, thereby alleviating conflict existing demand actual capacity. However, hazards caused by micro-pressure wave amplitude of tunnel that occurs when is running at higher speeds are also unacceptable. At this stage, mitigation measures to control waves generated trains 600 km/h within reasonable limits urgent develop new measures. In study, a three-dimensional, compressible, unsteady SST K–ω equation turbulence model, an overlapping grid technique were used investigate mechanism effect Helmholtz resonators with different arrangement schemes on exit in conjunction dynamic model test. The results study showed pressure forms enters passes through resonator. This turn leads resonance air column its neck, which causes energy dissipation as incident frequency resonator band. suppresses rise initial compressional gradient, resulting effective reduction exit. Compared conventional tunnels, scheme 94-cavity resulted 31.87% 20 m from but 16.69% increase maximum wall. After arranged according 72-cavity optimization scheme, wall decreased 10.57% compared before optimization. did not significantly differ