The pairing of a swirling spillway to the lower pool through the thrown jets

Abstract

In the modern practice of hydraulic engineering pressure hydrosystems reach H ≥ 200 m. In these conditions the most efficient spillway structure is the vortex shaft spillway. In this paper, the authors consider the conjugation of the swirled flow at the outlet of the discharge conduit with downstreem by thrown jet with a residual twist. In the scheme with jet drop, the residual twist of the flow during the release from the vortex spillway contributes to the expansion of the jet in the air, reducing the specific flow rate, as well as reducing the dynamic loads on the lower bed. The comparison with the jet thrown from the sock of the drainage dam at the same speed parameters (i.e. at the speed of 20-25 m/s on the lip) is carried out. The formula obtained is simple enough to determine the planned outline of the discarded jet. The scheme of conjugation of the jet with the surface of the lower tail water, as well as the calculation scheme to determine the specific discharge of the downward swirling jet.

Keywords

• вихревой шахтный водосброс
• параметр закрутки
• остаточная закрутка
• нижний бьеф
• число Фруда
• водовоздушная смесь
• тангенциальная скорость
• отброс струи