So there is much important significance to deeply understanding the characteristic of electric propulsion device by studying the performance of a propeller load.
因此研究螺旋桨负载特性对于深入认识电力推进装置的特点有很重要的意义。
2
First, the generation mechanism, components and frequency characteristic of radiated noise of naval ships are studied. There exists periodical modulation for the amplitude of propeller noise.
首先讨论了舰船辐射噪声的产生机理、构成和频率特性，指出螺旋桨噪声的振幅存在周期性调制。
3
Viscous flow around a duct propeller under open water condition was simulated by solving RANS equations, and the characteristic of the flow field was described.