A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Full-scale flow measurements in a tunnel airshaft
Bahn-2000 is a new railway in Switzerland enabling trains to travel at up to 200 km/h. The alignment of the railway required the provision of tunnels whose cost has been reduced by the provision of airshafts for pressure relief. The commissioning trials for the new railway included a programme of aerodynamic measurements to confirm that comfort on-board trains would be acceptable. This paper describes an extension of the programme to include detailed flow measurements inside an airshaft in one of the tunnels. The motivation for the measurements was a desire to explain discrepancies between measured and predicted pressure histories in tunnels. The outcome is positive insofar as it has clarified important aspects of the flow behaviour and, in so doing, has revealed deficiencies in existing predictive models. The primary purpose of the paper is to make the data easily available to anyone who can use it. A second purpose, namely to interpret some of the data, leads to an unexpected result that raises a new question. Researchers now need to explain how almost-constant flow can be sustained in an airshaft when the pressure in the tunnel at the base of the shaft is far from constant.
Full-scale flow measurements in a tunnel airshaft
Bahn-2000 is a new railway in Switzerland enabling trains to travel at up to 200 km/h. The alignment of the railway required the provision of tunnels whose cost has been reduced by the provision of airshafts for pressure relief. The commissioning trials for the new railway included a programme of aerodynamic measurements to confirm that comfort on-board trains would be acceptable. This paper describes an extension of the programme to include detailed flow measurements inside an airshaft in one of the tunnels. The motivation for the measurements was a desire to explain discrepancies between measured and predicted pressure histories in tunnels. The outcome is positive insofar as it has clarified important aspects of the flow behaviour and, in so doing, has revealed deficiencies in existing predictive models. The primary purpose of the paper is to make the data easily available to anyone who can use it. A second purpose, namely to interpret some of the data, leads to an unexpected result that raises a new question. Researchers now need to explain how almost-constant flow can be sustained in an airshaft when the pressure in the tunnel at the base of the shaft is far from constant.
Full-scale flow measurements in a tunnel airshaft
Vardy, A. (author) / Hagenah, B. (author)
2006
15 Seiten, 9 Quellen
Conference paper
English
Full-scale flow measurements in a tunnel airshaft
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