Figure 194 — Some streamlines, on one side of the plane of symmetry, past a 

 cylinder with a wake of maximum size behind it. 



> 



K 















/ 





V 



^ 











/ 







'" \^ 



"K 





/ 







^>2J-j0f 





IV' 



% 







/ / 



/ 











^: 





.'-- 



/ 



■/ 



-— Ij 



3-105' 







\ 



\ 



/ 





/ 













V 



^ 

















\ 



s— .^ 











20 40 60 80 100 120 140 160 180 



Figure 195 — Pressure on a cylinder in a 

 stream with a wake behind it. 



The ordinate represents excess of pressure above pressure at infinity, divided by pV /2 where U is the velocity 

 in the approaching stream. Curves I and III are for the limiting' forms of the free streamlines, leaving the cylinder 

 at 55° or 120°—; these and Curve II continue through the wake along the axis. Curve IV is for the theoretical 

 continuous flow of Section 67. The broken curves represent observed pressures, under conditions of laminar flow 

 (i? < 1.3 X 10 ) and of fully turbulent flow {R > 2.3 X 10 ); R is Reynold's number. See Section 117, "Circular 

 Cylinder." (Copied from Reference 199.) 



Figure 196 — Streamlines pa&t a wall carrying 



a triangular bridge, back of which a wake 



exists. (Copied from Reference 188.) 



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296 



