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采用Realizableκ-ε双方程紊流模型对由4个弯头组成的弯曲输水管路进行数值模拟,分析弯头间衔接段长度及管路内壁相对粗糙度对水头损失的影响。通过定义调整系数I,定性分析了弯头后直管对水流的调整作用,并指出在实际工程中,对弯头局部水头损失进行测量时,弯头后截面的选取在10～12倍管路直径处为宜。当弯曲管路水头损失以局部水头损失为主时,管路内壁相对粗糙度对总水头损失的影响可忽略。对输水管系弯曲管路水头损失的计算结果和物理模型的模拟结果基本吻合。
A Realizableκ-εtwo-equation turbulence model was used to simulate the curved water pipe with four elbows. The influence of the head length and the relative roughness of the inner wall of the pipe on head loss was analyzed. By defining the adjustment coefficient I, the adjustment effect of the straight pipe on the water flow after the elbow is qualitatively analyzed. It is pointed out that in the actual project, when the local head loss of the elbow is measured, the section of the elbow after the cross-section selection is between 10 and 12 pipelines Diameter is appropriate. When the head loss of the bent pipe is dominated by the local head loss, the relative roughness of the pipe wall can negligible the total head loss. The calculation results of the head loss of the bent pipelines of the water pipe system are in good agreement with the simulation results of the physical model.