Title
Experimental pressure wave research at NLR for high-speed rail tunnels
Author
Demmenie, E.A.
de Bruin, A.C.
Klaver, E.
Institution
National Aerospace Laboratory NLR
Date
1998-08-31
Abstract
Pressure waves, that are generated when a high speed train enters a tiinnel, can cause annoyance to train passengers (rapid pressure fluctuations acting on the train) and for people living near the tunnel (micro-pressure wave). To improve train passenger comfort the effect of various pressure relieving measures (i.e. shafts and porous walls) were investigated in a siib-scale test. A 1/175 scaled model of a double tracked underwater tunnel, planned for the high speed train link between Amsterdam and Paris, was used. Train models were launched with a facility working according to the air gun principle. Tunnel wall pressure histories generated by the train model were measured. These test results are compared with those predicted by the THERMOTUN/4 calculation method. With the same air gun facility the steepening of a compression wave in a tunnel and the micro pressure wave emitted from the tunnel exit were studied. The main purpose of this study was to develop the required measurement technique for such tests. The experiments were made in two short tunnel models with an unusually high blockage ratio. These test results are compared with a simple (mviscid) theoretical model and experimental results obtained at SNCF.
Subject
Compression waves
Mathematical models
Perforated plates
Porous walls
Pressure reduction
Rail transportation
Scale models
Transient pressures
Tunnels
Wave attenuation
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Publisher
Nationaal Lucht- en Ruimtevaartlaboratorium
Access restriction
Campus only
Source
NLR Technical Publication TP 98375
Part of collection
Aerospace Engineering Reports
Document type
report
Rights
(c)1998 National Aerospace Laboratory NLR