A Study on the Overrun of Turbochargers for Main Diesel Engines Using FTA

概要

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Turbocharger overruns, resulting from explosive fires that occur in the exhaust gas manifold and cause catastrophic failure of main diesel engines, have been a persistent problem for many years. Some investigation results showed certain characteristics, one of which is that there is remarkable tendency for increased failure rates as engine running hours increase, while another is that these failures have mainly occurred in three types of engines. A study was carried out using FTA, ASTM flash point test, and Importance Measures Analysis to identify the cause of the failures and possible preventive measures. The results of the FTA showed that these failures were caused by an accumulation of unburned fuel oil in the exhaust gas manifold during auto-ignition. Further, it was found from the Importance Measures Analysis that the failure rate can be reduced by lowering the auto-ignition probability of unburned oil. Accordingly, it is shown that an improvement in combustion conditions and effective regular maintenance of the turbocharger would be effective in reducing this kind of failure.
財団法人日本海事協会の論文