The paper presents a comparison of the results obtained by experimental campaigns, performed in different wind tunnel plants on the same train model. The comparison will be presented in terms of global forces and pressure distribution on the first vehicle of the train model. Tests have been performed on a flat ground configuration and allow to investigate the effects related to the Reynolds number on the different components of the global aerodynamic force, to the blockage ratio, and to the adoption of open or closed wind tunnel test section. The sharing of the same scaled model and the availability of detailed data regarding the pressure distribution in the different test conditions allow a good insight in the modeling of the train aerodynamics in wind tunnel. The following conclusions can be drawn: 1. Good agreement is reached by the comparison of wind tunnel results performed at different wind tunnel plants on the same 1:10 scaled train model. 2. Results showed negligible Reynolds number effects especially for those coefficients involved in the cross wind analysis (CFy and CMx). 3. Differences in the results are present in CFz, CMy and CMz coefficients between PMWT HS and PMWT LS data while TsAGI (open section) and PMWT LS (large closed test section) data are in good agreement on all the coefficients apart from CMy for yaw angles higher than 20 deg. 4. Differences between PMWT HS and PMWT LS data may be due to different wind tunnel test conditions as turbulence intensity levels and splitter plate geometry being the model and the measurement set-up the same in both the wind tunnel campaigns. 5. The different CMy behavior, for yaw angles higher than 20 deg, between TsAGI and PMWT LS data, can be explained by analyzing the pressure distribution measured on the train model especially in the upper and lower leeward parts of the train in the forepart.


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    Title :

    Comparison of wind tunnel tests results on the ATM train


    Additional title:

    Vergleich der Ergebnisse von Windkanaluntersuchungen über den ATM-Zug


    Contributors:


    Publication date :

    2009


    Size :

    10 Seiten, 8 Bilder, 3 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English