For large turbochargers, which operate on large diesel engines in ships and diesel power stations, the demands of pressure ratio and volume flow grow with increasing engine output. In general this also means an increase in the resulting noise. The dominating noise contribution of the turbo-charger is radiated from the compressor inlet. Further significant sources of noise are found in the components directly connected to the compressor outlet such as at the air discharge pipe, air cooler and receiver. With the recent improvements in inlet silencers and turbocharger insulation, the noise radiated from the compressor outlet into the discharge pipe becomes increasingly significant. The compressor test rig at ABB Turbo Systems Ltd has recently been modified and adapted such that detailed acoustic investigations on compressor components as well as on silencers can be carried out. Apart from basic research and controlling of noise sources at the compressor inlet and in the blade / vane interaction area, experimental investigations into noise reduction with resonator and absorber silencers were carried out in the acoustic laboratory as well as on the compressor test rig. Through a combination of primary and secondary measures it has been possible to substantially reduce the noise level for the significant first two blade passing frequencies at the compressor outlet. This was achieved with a new diffuser and an outlet silencer. The acoustical performance of the new components was proven on turbochargers of the type TPL80- B and TPL85-B. While the new diffuser significantly reduced the 2nd blade passing frequency the layout of the resonator silencer was focused on the 1st blade passing frequency. The absorber silencer reduced the 1st as well as the 2nd blade passing frequency through its wide band characteristic. The noise measurements on the engine test bed, as well as on the chosen installations, fully confirmed the laboratory measurements. The results show that one of these measures is sufficient to fulfil even in today's critical cases the required limits. With a combination of such measures even future, more stringent, limits can be fulfilled.


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    Title :

    Low noise turbochargers


    Additional title:

    Geräuscharme Turbolader




    Publication date :

    2004


    Size :

    10 Seiten, 26 Bilder, 6 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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