NGHIÊN CỨU XÁC ĐỊNH RANH GIỚI CHẢY VÀ HỆ SỐ NGẬP CỦA TRÀN PIANO

Abstract

The piano key weir (PKW) is a type of the discharge structures with a zigzag line to increase the discharge length, increase the discharge ability to unload against a traditional spillway. The discharge ability of PKW will decrease when PKW is in submerged flow, indicated by submerged coefficient s_n. This article presents the results of experience studies on the section model and establishes the formula for determining boundary of the submerged flow and the formula calculate of submerged flow coefficient. Calculated results according to the establish formula against the experimental results for small error, applies to range of large water head, distribution trend in accordance with hydraulic characteristic rule.