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Flow noise: in ventilation ducts
1999 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The speed of trains on original tracks has increased and will increase even more, maybe up to 300-350 km/h. To decrease the energy consumption it is necessary to reduce the front area of the train. This means that the space for ventilation ducts will decrease. Because the area decreases the air velocity in the ducts must increase to get the same airflow. The purpose of the project is to measure and express sound pressure level (Lp) and the pressure loss as a function of width/height-ratio (w/h-ratio) and the air velocity (u) in a ventilation duct. Models for velocities 4 to 14 m/s and w/h-ratio 1 to 4 are wanted. To reach this goal designed experiments were done on a duct in a X2000 test car.

Place, publisher, year, edition, pages
1999.
Keyword [en]
Technology
Keyword [sv]
Teknik
Identifiers
URN: urn:nbn:se:ltu:diva-51618ISRN: LTU-EX--99/040--SELocal ID: 8d13214b-1c84-4e3d-bc8e-d57bc56b797fOAI: oai:DiVA.org:ltu-51618DiVA: diva2:1024980
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Examiners
Note
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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