1,000 



100 





























































































1 











O /3 = 1.0 

 a /3 = 3.0 

 A /3 = 5.0 

 H /3 = 7.0 



1 









































1 





















\ 





\\ 



\ 











1 



1 















I 







\\ 







\ 



1 











) M 



J 





\ 



! 







/ 





11 



^v 



/ 











w 



T^ , 



>^ 





\\ 





M 













M 









1 





J^ 









If 





"T 









m 













/ 











[? 



^ 











0.57T 1.07T 1.57T 2.07T 



Nondimensional Frequency, W - ^ — c — ' 



Figure 23. Variation of y-'^^^ with /3 for a particular M- 



45 



