Abstract: Stress concentration phenomenon can be addressed by setting a linear-chamfer angle at the bifurcation, given the certain bifurcation angle. In the present work, the hydraulic characteristics of round-chamfered and linear-chamfered bifurcated pipes are numerically investigated, including the flow behaviors, discharge capacity, and characteristics of pressure distribution, with different geometric conditions considered. The results show that in a linear-chamfered pipe, the flow is smooth and its mainstream is in a direction largely along the branch pipe axis, while a round-chamfered pipe shows rather intricate flow patterns. Compared to that without a chamfered angle, the maximum relative declines in discharge capacity are 0.5% and 6.8% for linear- and round-chamfered pipes, respectively; the discharge capacity of a linear-chamfered pipe is greater. The pressure distribution behavior changes little when the pipe is linear-chamfered, but it become significantly different when round-chamfered.

Key words: bifurcated pipe, chamfering angle, hydraulic characteristics, numerical simulation