GB1013757A - Rotating liquid whistle - Google Patents

Abstract

1,013,757. Whistles. E. C. COTTELL. Feb. 3, 1964 [Feb. 12, 1963], No. 4487/64. Heading G5J. In a liquid whistle, fluid under pressure is pumped through a hollow shaft 1 into a rotor and is discharged through one or more peripherally located orifices 2 in jets which strike the edges of blades 4 carried by a concentric rotatable framework 3, the blades being set in the framework so that their planes are approximately in alignment with the axes of the jets as impacts occur. The rotor and/or the framework may be rotated so as to add to the relative velocity between the jets and the blades. As described, a rotor of diameter 8.9 inches with four jets is associated with a framework carrying twenty blades, the inner edges of which are set to a circle of diameter 9.0 inches. With the rotor and the framework with blades each rotating at 1500 r.p.m., but in opposite directions, the impact velocity of the jets with the blades is increased by about 110 ft/sec. The natural frequency of vibration of the blades may be made equal to the total number of impacts between jets and blades per second (4000) or to the number per jet per second (1000) or to a multiple thereof. The jet orifices may be dimensioned to produce jets of substantially ribbon form. The rotor and the framework with the blades are contained in a housing with a peripheral discharge opening, which may be provided with a throttle for regulating the downstream pressure, Fig. 3 (not shown). In another embodiment, Fig. 2 (not shown), the jet orifices and the blades are arranged for axial flow of the fluid, the blades being mounted similarly to those of a turbine.