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Abstract

The shape of a toilet siphon pipe was characterized by six shape parameters to facilitate study. •Under one single shape parameter, a toilet can obtain good flushing performance when the climbing angle, the arc width, the arc height, the pipe diameter, the climbing width, and the climbing height are 48°, 45 mm, 210 mm, 50 mm, 90 mm, and 30 mm, respectively. •The flushing performance of a toilet is not proportional to the siphon pipe diameter under the condition of the same water consumption.