Abstract
Recently, high pressure injection systems have been widely adopted in diesel engines. However, many problems have arisen. One of them is cavitation erosion in the fuel injection system. This erosion is very harmful to the performance and reliability of the engines. A new approach different from the steady flow approach is employed to study this unsteady cavitation phenomenon. In this study, the cavitation phenomenon is clarified by measurement of the pressure, fuel velocity and cavity, and calculation of the axial distribution of the pressure and cavity volume. The method of predicting the degree of erosion is investigated by the injection characteristics. It is clarified that the degree of erosion is well predicted by the overall value of the high frequency alternation contained in the injection pressure.
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