Abstract: The rotation of turbine at small attack angle is theoretically analyzed in order to obtain the rotation characteristics of a turbine in front of an underwater fuze at small attack angle, and the simulation models and an experimental program are created. On this basis, the turbine speed at flow velocity of 0 m/s~ 35 m/s is obtained at 0° and 5°attack angles. For the non-cavitation and the cavitation number from 0.2 to 1.0, the corresponding characteristics of the turbine rotation and cavitation at 10m/s are analyzed by comparing the simulation and experimental results at 0° and 5°attack angles. The results show that the simulation and experimental results are basically consistent and well predict the turbine characteristics. Compared with 0°attack angle, the turbine speed at 5° attack angle becomes higher at lower flow velocity and vice versa; under cavitation, the periodical change of original speed signal of turbine disappears at 5°attack angle, and the turbine stalls in the case of lower cavitation number.

Key words: ordnance science and technology, fuze turbine, water tunnel experiment, fluid simulation, small attack angle, cavitation