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Experimental study on resistance characteristics of flumes with different cross-section shapes

Resistance similarity is a key principle in river models.To simulate resistance,the artificial roughening method is employed.Experiments are performed to compare the resistance characteristics of a V-shaped flume and a rectangular flume,both with Y-shaped materials to enhance their roughness.Research results show that,in the turbulent regions,the resistance coefficient of the V-shaped flume changes very little with the Reynolds number,but that of the rectangular flume appreciably decreases with the Reynolds number.When the Reynolds number reaches 10000,the resistance coefficient of the rectangular flume is larger than that of the V-shaped flume.As the Reynolds number increases,the resistance coefficients of both types of flumes trend to have equivalent values.