Xây dựng công thức xác định hệ số khả năng tháo cho tràn piano chảy tự do

Abstract

Piano Key Weir (PKW) is a new spillway type that has been researched, developed and strongly applied in the last 20 years. To date, there have been many studies in the determination of the structure, determining the main geometric elements, the key hydraulic factors affecting to the discharge capacity of PKW. However, the establishment of the formula for determining the discharge capacity is still discrete. The published formulas have accessed to the limits of the geometry and types ( type A, type B, console 1 or 2 sides) without accessing to the state of flow through the spillway. So that these formulas have not reached to strictly accuracy. The paper is presented the research results of establishing the formula of determination the discharge capacity by flow states, from experimental data on physical models. The author's formula has a error of less than 12.5% compared to the results of many authors' experiments and is suitable for practical calculations.

Keywords: Discharge capacity, Piano key weir, physical experimental model.