Johnson, Jr, 



If the above-mentioned assumptions are made, the value of the optimum ve- 

 locity ratio can be found either directly or by means of an iterative process. 

 We have been able to derive it directly in the cases illustrated in Table Al (see 

 Table A2). 



The formulas are valid for all cases of free jets. In the case of the jet on 

 wake they are valid only if x^ and X2a-re considered, as an approximation, as 

 independent of the inlet area or the inlet velocity ratio. 



Table A2 

 Direct Evaluation of the Optimum Velocity Ratio 



1058 



