抄録
Fluid amplifier devices with no moving parts offer considerable promise as simple, reliable elements for control systems. Though the device is simple in its basic operation, it is difficult to predict its performance by analysis. This paper is concerned with a simplified method for predicting the static chracteristics of a proportional, jet-deflection-type fluid amplifier.
The analysis is based on the assumption that the working fluid is incompressible, and forms a turbulent jet in which the velocity distribution can be represented two-dimensionally by a third order equation. The input chracteristics (pressure-flow chracteristics of control nozzle) are obtained as a function of control nozzle geometry. The output characteristics are obtained in relation to the control nozzle and receiver design parameters and are discussed in terms of the following two chracteristics: (1) the pressure chracteristics at zero receiver flow, (2) the flow chracteristics at zero receiver pressure. The pressure-flow chracteristics of receiver are presented as a function of the pressure at zero receiver flow and the flow at zero receiver pressure.
The effects of the control nozzle geometry on the following factors are also discussed: the pressure gain at zero receiver flow, the flow gain at zero receiver pressure, the linearity, the maximum flow recovery and maximum pressure recovery.
The experimental data to verify the analysis show good accordance with the theoretical results.
