| 摘要 |
PURPOSE: To enhance the efficiency at low speeds without degrading the supercavitating section performance at high speed by providing hybrid blades in which cavitation is not caused in the radially inner section of each blade and supercavitation is caused in the radially outer section thereof. CONSTITUTION: In the body 11 of a plurality of propeller blades 10 supported by a hub 12, the sharp edge 38 functions as the front edge during rotation, and the edge 40 functions as the rear edge; and arc-shaped suction and pressurization side surfaces 24, 26 are formed so that the cavitation is not caused in the radially inner section 18 at the time of high speed rotation. Further, arc-shaped suction and pressurization side surfaces 34, 36 are formed so that the radially outer section 28 causes supercavitation. In other words, supercavitation is caused in each blade 10 at high speed, however, in addition to the outer section 28 where subcavitation is caused at low speed, the inner subcavitation section 18 is provided. Thus, the operation under the subcavitation of both sections in each propeller blade is enabled without impairing the function of the supercavitation sections at high speed, so that the efficiency at low speed can be improved. |
