Abstract
The problem of the root erosion experienced on the propellers of a destroyer which was built in Nagasaki Works was investigated experimentally. Starting from our experience that cavitation erosion on marine propellers is closely connected with unsteady cavitation, we carried out cavitation tests in oblique flow condition. The test results and the observation of the full scale propellers have shown that(i) such root erosion can be ascribed to the effect of obliquity of the flow to the propeller, and(ii) it can be simulated in the cavitation tunnel with inclined propeller shaft. It is expected, therefore, that cavitation test in oblique flow condition is useful and plays an important role in further investigation into this problem.
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