Abstract
The high-pressure injection system has been installed in small high-speed engines in recent years, in order to improve the atomization process of the spray and to reduce the exhausted particulates from engines. However, cavitation erosion appears to occur in this system. In this study, the formation process of cavitation bubbles was investigated via measurement of the pressure history and that of the power spectrum density, PSD, of the high-frequency component of the pressure in the injection pipe. It is revealed that PSD at the early secondary stage pressure is govemed by the differential pressure, Δp. Then mechanism of the generation of erosion source can thus be explained.It is clear that the characteristic value, f(Δp), controls the erosion level.
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