高速艇用プロペラの耐キャビテーション・エロージョン性について

抄録

Considerable cavitation erosion has recently been observed in high-speed boats of a certain class on their propellers after a continuous high speed operation of only several hours.
Such cavitation erosion occurred within a small area of the propeller-blade roots.
The present study has been made with the object of finding effective means for the prevention of the cavitation erosion.
High Mn-Al bronze and high Ni-Al bronze propellers were prepared for this study. The high-speed boat was equipped with two propellers, and was operated for 4 hours at the rate of over 30 knots per hour.
The results obtained are as follows:
(1) It is confirmed that cavitation erosion resistance of high Mn-Al bronze propeller is more efficacious than that of high Ni-Al bronze.
(2) It is supposed that two materials better than Al bronze (AlBC3) about cavitation erosion resistance have been found.
(3) The tendency shown in the present operating test is the same as the result of the magnetostrictive cavitation test.