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进出口连接渐变段是渡槽工程的重要组成部分。传统的直线扭曲面或八字墙形式边界处存在折点(拐点),水流易折冲或脱壁,会对工程造成危害。渐变段采用新型的反向双抛物线扭曲面或反向双圆弧扭曲面,边界处消灭了拐点,能较好地与水流流线吻合,是一种理想的连接形式。本文结合洛惠渠曲里渡槽水工模型试验,对渡槽新型连接渐变段的体型及水力设计进行了探讨。
Import and export connection gradient section is an important part of the aqueduct project. There is a break point (inflexion point) at the boundary of the traditional linear twisted surface or the shape of the character wall, and the water flow is easily inflated or detached, which may cause harm to the project. The gradient section adopts a new type of reverse double parabolic twisted surface or reverse double circular arc twist surface, and the inflection point is eliminated at the boundary, which can better match with the flow line of water and is an ideal connection form. In this paper, the body shape and hydraulic design of the aqueduct new transitional section are discussed in combination with the Liaoqu Canal Curvature Hydraulic Model Test.