noted further that the flow amplification factor (defined as AQq/ AQc) 

 for the amplifier is about 50, which is considerably higher compared 

 to the other fluid state proportional devices" with a corresponding 

 maximum value of 10. Further, it can be seen from the test data 

 (Table 8) that the maximum control flow for operating the amplifier 

 is about 4.6 percent of the total supply flows. These features make 

 the amplifier suitable for applications where sensitivity and low 

 control flows are required. Another attractive quality of the 

 amplifier is that it can switch flow from one output port to the 

 other completely. Thus the amplifier is a suitable metering device 

 for mixing systems. To make an evaluation of the amplifier's performance 

 and to verify the theory developed earlier its dimensionless output 

 flow characteristics were obtained in tie manner described here. From 

 the known Q^ and Q^ at a given operation condition, the parameter 



w / 



-( 



P 



p \ is computed. Further, by recalling that for a known value of 



/q Y- ■ 



p\Qay 



w parameter p can be obtained either from Equation (11-c) or directly 

 from the curve shown in Figure 23. Since x , w , and q are known. 



dimensionless output flow parameter Q / w is calculated for 



Q p / X 

 a V o 



each value through the output ports, , and The data on the 



dimensionless characteristics thus computed are listed in Table 8, 



whereas a plot of Q [w verses Q is shown in Figure 32, 



_£ S / _£ _£ 



Further, theoretical values of output flow Q^ /w for various 



Q PV x^ 

 a o 



Q /Q were calculated from Equations (20) and (21). Value of s, 



required in the above calculations was obtained from the consideration 

 that the power jet deflects by 22° while the control flow changes from 

 zero to 0.267 gpm. The theoretical characteristics are plotted on the 

 same plot as the experimental characteristics (Figure 32) for comparison. 

 It can be seen from Figure 32 that the experimental values of the parameter 



o a a differ from its theoretical values by as much as 10 percent. 



a "^ o 



The deviation of the experimental values from the theoretical values 

 is attributed primarily to the effect of the output port impedance on 

 the power jet and the magnitude of the control flow, not added to 

 power jet flow. It is evident, however, that the experimental 

 characteristics are linear over a wide range of the control flow and the 



24 



