A Study on the Repeatability of Cavitation Tunnel Tests

概要

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In order to understand the level of the accuracy and the repeatability of cavitation tunnel tests, a propeller model was tested repeatedly in cavitation tunnel and in open-water. The test results were analyzed in terms of the variation of thrust and torque at each set of advance constant and cavitation number. From the test results and the analysis, it can be concluded that(1) the variation of cavitation test results is, in non-cavitating condition, about the same as the variation of open-water test results, while in cavitating condition the variation of cavitation test results is about three times as large as the variation of open-water test results, (2) effect of air content on cavitation test results is not so clear for the range tested (α/α_s≒15-14%), (3) there is a nearly linear relationship between the variation of thrust and torque, thus it is considered that the variation of thrust and torque is mostly due to the variation of the lift on the blade.
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