Flow characteristics inside and outside of a dual-screen cooling
water intake assembly ("riser") for the James H. Campbell Unit No.3
were observed and measured in hydraulic models at scales of 1:3 and 1:12.
Risers consist of dual cylindrical screens with horizontal axis and solid
endplates mounted on a T-assembly which is supported by a 3.5 ft diameter
vertical withdrawal pipe. Pressure losses within the assembly, approach
flow velocity patterns and approach flow velocities on the screen surface
were investigated. A total headloss coefficient of 4.6 resulting in an
equivalent full-scale headloss of 8.0" of water at a withdrawal rate of
29.44 ofs through the assembly was measured in the model. Flow patterns
towards single and multiple risers were observed by dye tracing techniques.
Approach flow velocities were measured on the surface of the 1: 3 scale
riser model. The highest velocities were found near the center of the
screen and the lowest ones near the projecting endplates. Maximum local
velocities exceeded calculated average velocity by about 30 per cent.
Consumer Power Company; Commonwealth Associates Inc
Stefan, Heinz G.; Dahlin, Warren Q.; Ripken, John F.; Wood, Addison; Winterstein, Tom.
Experimental Flow Studies With the Dual-Screen Cooling Water Intake Assembly ("Riser") for the James H. Campbell Electric Power Generating Plant, Unit No. 3.
St. Anthony Falls Laboratory.
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