Abstract
The noises associated with a fluidic device have been investigated by several authors from different aspects, but the internally-generated noises due to the structural components of a beam deflection amplifier still remain to be studied.
In the present study, the cases of the internally-generated noises were experimentally investigated from the following two points:
1) The noises associated with the design parameters relative to the rectangular flow path (length, aspect ratio, nozzle shape, connecting line), single receiver (width, edge angle at its entrance, position), and load resistance.
2) The source and propagation of the noise caused by the interaction of the control flow with the power flow. This point was investigated by using correlation techniques and spectrum analysis.
The following facts are especially pointed out: The noises in the rectangular flow path are greatly affected by a discontinuous form of the flow path.
The noise source due to the interaction of jets is considered to be in the shear layers formed by the discontinuous velocity of the jet.
The deflection of the power jet is not affected by the velocity fluctuation at the control nozzle and the noises generated at the power and control nozzles propagate along the power flow and the control flow respectively.
