WebMar 17, 2024 · The pressure at the upstream (left-hand) end of the tunnel is then increased rapidly in a prescribed manner, causing a steep-fronted wavefront to propagate along the tunnel. When the wavefront reaches the exit portal, it reflects back along the tunnel and … Table 2 and Fig. 18 (c) indicated that a limited reduction of approximately 4.88% … Reduction of micro-pressure wave radiated from tunnel exit by hood at tunnel … An impulse wave is a micro-pressure wave, which leads to environment problems … In all test cases the flow rate is increased linearly from an initial steady state … Then the main micro-pressure wave “a” and the branch micro-pressure wave “ a ′ ” are … WebAug 16, 2024 · The relationship between the MPW and the nose-entry wave and the effects of train speed and the tunnel exit hole on the MPW are analyzed. The results show that the MPW decreases with...
Aerodynamic Effects of Inclined Portals on the Initial Compression Wave …
WebMay 25, 2013 · When a train enters a tunnel at high speed, an impulsive pressure wave, called a micro-pressure wave, is radiated from a tunnel exit portal. Because it is one of … WebBackground-corrected sound pressure levels are identified and then compared with the source levels measured in the cavitation tunnel of the Potsdam Model Basin (SVA). It is found that free-field computations corrected by tunnel-induced effects match well with experiments up to 100 Hz (in the one-third octave band), whereas relevant ... crossfold electrical wholesalers ltd
Measures to Counteract Micro-pressure Waves Radiating …
WebSep 12, 2006 · Micro-pressure waves are recorded in a point located 20 mm above the tunnel ground and 120 mm far from the tunnel exit. Time histories of pressure inside the tunnel are also monitored in different sections. WebOct 27, 1998 · An analytical investigation is made of the compression wave generated when a high-speed train enters a long tunnel with distributed venting. The compression wave amplitude is determined by train speed and the area ratio of the train and tunnel, but its rise time depends principally on the geometry of the tunnel entrance. WebGeneration of the compression wave by a train entering a tunnel is investigated by model experiments. In the model experiments, the train and the tunnel are represented by an axisymmetric model, a three-dimensional mirror image model and … bugx 1751 locomotive