Calculation method for quaternary curve equation forming of three-dimensional shape of low hump outlet channel

Abstract

The invention relates to a shaping algorithm for a quartic curvilinear equation of a three-dimensional shape of a low hump type water draining flow way and application of the shaping algorithm, and belongs to the technical field of pump stations of water conservancy projects. The low hump type water draining flow way is designed by the shaping algorithm. The shaping algorithm is characterized in that an upper side line and a lower side line of a longitudinal section of the flow way, a width changing curve of the flow way and a transitional circle center track line of the cross section, which is changed into square from circle, of the flow way are respectively set into the quartic curvilinear equation; the flow way is divided into a rising turning section and a falling section, the rising turning section turns at an angle of 90 degrees, influences of a centrifugal force on water flow are reduced to a maximum extent, the height of the rising turning section is increased as much as possible under the condition of arrangement permission of a pump room, and a turning radius of the rising turning section is increased; the falling section guides the water flow to be connected with a water draining pond gently and orderly, so that the crest level of the cross section of an outlet of the flow way is lower than the minimum water level of the water draining pond by 0.5m; and the water flow of the designed low hump type water draining flow way turns orderly and is scattered uniformly, loss of a water head of the flow way is low, and the hydraulic performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering pumping stations, and in particular relates to a calculation method and application for forming a quaternary curve equation of a three-dimensional shape of a low-hump outlet channel, and is mainly used for designing a low-hump outlet channel with excellent hydraulic performance. Background technique [0002] The low hump outlet channel is one of the commonly used outlet channel types for large pumping stations. It is suitable for vertical low-lift pumping stations that cannot use siphon outlet channels due to large fluctuations in the water level of the outlet pool. The function of this type of outlet channel is to guide the water flow to turn in an orderly manner and spread evenly in the process of flowing from the outlet of the pump guide vane body to the outlet pool, so as to reduce the head loss of the outlet channel as much as possible and recover the flow energy of the w...

AI Technical Summary

Problems solved by technology

The low-hump type outlet flow channel has been designed in the past using the "average flow rate method" based on one-dimensional theory. , the water flow is strongly affected by the centrifugal force when turning, and a strong vortex is generated after turning, resulting in a large flow channel head loss, and at the same time significantly increasing the instability of the water flow, which seriously affects the safety and stability of the pumping station and efficient operation

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