ĐẶC TRƯNG HÌNH DẠNG VÀ NỐI TIẾP CỦA DÒNG CHẢY QUA TRÀN PIANO

Abstract

Piano Key Weir (PKW) was the spillway that had the zigzag crest sharp, creating keys same as keys of the piano. The flow on inlet and outlet keys had different characteristic depending on water head, which affects the discharge capacity of PKW and downstream flow. This paper presents characteristics of flow on the PKW from the results of the physical experimental model and 3D numerical model. Accordingly, analyzing, defining the full regime and incomplete regime of outlet key with the boundary value was H_u/W_o=0.5,  The downstream flow form along the input key is falling flow, along the output key is the bottom flow. The bottom flow rate accounts for 80% ÷ 90% of the total flow of the PKW.