The AOA project is targeting on solving existing problems in the field of open air aerodynamics which have a major and practical relevance to safety, reliability, and cost efficiency of railway operation, especially in the cross-border. Various project partners - operators, manufacturers, and infrastructure managers - are under severe pressure to take measures in order to avoid future ballast projection. To da so it is most important to gain general knowledge about the overall mechanism of that phenomenon. Analyzing that phenomenon also requires further studies in modeling the underfloor aerodynamics. The falter is also of interest for other issues of interests like cooling of engines etc. It is the principle project objective to gather the so-far gained aerodynamic, track dynamic, and ballast dynamic knowledge of infrastructure operations, train operators, and train manufacturers and to co-ordinate resources and studies in a concerted effort in order to come to a comprehensive understanding of that phenomenon. Following this objective the projects main goals are: to set up a best practice approach to model the underfloor aerodynamics with the help of commercial CFD codes, thereby using field data as well as measurements obtained in a laboratory scale generic undeffloor geometry in order to assess the predietion accuracy, to use this approach to determine the aerodynamic aspects cf the ballast projection phenomenon, to identify and investigate the sub-processes (e.g. track. and ballast dynamics) and to set-up a comprehensive model which allows to study the overall mechanism, to pertorm parameter studies wich that model and to study Ihe interdependence to subprocesses, to identify the relevant aerodynamic parameters fer the assessment of a trains inclination to induce ballast projection, and to increase the experience with sensors to be installed in the trackbed and with the conditions of the measurement site. Since the feasibility of bogie fairings is one important issue with respect to further increasing train speeds while reducing noise emission and drag, the derived knowledge on underfloor aerodynamics should also serve to assess the thermal consequences of Ihe installation of bogie fairings, and thus, to assess their thermal feasibility.
Underfloor aerodynamics. Sub-project WP 1. Summary report. Final report. AOA - Aerodynamics in Open Air. DeuFraKo project .
2008
138 Seiten, Bilder, Tabellen, Quellen
Report
Englisch
TIBKAT | 2008
|DeuFraKo project "Aerodynamics in open air" (AOA), WP 2 "Cross wind issues" : final report
TIBKAT | 2008
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