The effect of the shape of the holes of the rotor and stator on the acoustic parameters of a dynamic axial generator

The paper presents the results of investigations concerning choice of the optimal shape (from the viewpoint of acoustical efficiency) of the holes of the rotor and stator of a dynamic axial generator, the horn and pressure chamber of which are common to all the stator channels. Compared to the sound power and the efficiency for a generator operating with the rotor preferred hitherto a doubling of the values of the parameters was achieved for a generator which has an approximate rectangular function for the time-dependence of the active surface area of the inlet holes of stator channels.