Resistance loss analysis and structure optimization of conical diffuser in siphon rectifying device

Abstract

Siphon water conveyance is a commonly used way to transport water in high efficiency, and its core equipment is the submerged rectifying device at the entrance. Due to the complex structure inside the device, the local resistance loss is too high, which has a certain impact on the water delivery efficiency. By taking the single conical diffuser inside the siphon rectifying device as the research object, analyzing the mesh generation and the simulation strategy. Of which the target is reducing the resistance loss. Then the optimal plan is yw=10μm, N=20, R=1.3, using k-ε standard. And the analyzing of the head loss in each part of the conical diffuser is based on the simulation results. The obtained head loss of the diffuse part account for 40%-50% of the total loss. The parametric analysis of the conical diffuser structure is carried out for the diffuse part. Through the orthogonal design and the result analyzed, the optimal structural scheme is L1=36mm, L2=74mm, D1=17.5mm, D2=24.6mm, these optimal structure scheme were validated using numerical simulation results.