Series of inclined water outlet flow passages with excellent hydraulic performance and application method thereof

Abstract

The invention discloses a series of inclined water outlet flow passages with excellent hydraulic performance and an application method thereof, and belongs to the technical field of water conservancy project pump stations. The application method comprises the following steps: providing the vertical views (including cross section position lines), plane expanded views (including cross section position lines) and cross section data tables of six inclined water outlet flow passages cooperatively used with inclined shaft extension pumps with the tilting angles of 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees and 40 degrees; determining the corresponding inclined water outlet flow passages according to the design net pump head of a pump station intending to use the series of inclined water outlet flow passages; multiplying data in the data tables of the determined inclined water outlet flow passages by the impeller diameter of a water pump of the pump station intending to use the series of inclined water outlet flow passages for conversion, and thus obtaining the dimensions of the inclined water outlet flow passages of the pump station. The flow passages after conversion are orderly in water flow direction, uniform in diffusion, little in head loss and excellent in hydraulic performance. The series of inclined water outlet flow passages is high in practicability and convenient in application, and has important meanings for guaranteeing the design quality of inclined water outlet flow passages and guaranteeing the safety, stability and efficient operation of the pump station.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering pumping stations, and in particular relates to a series of inclined water outlet channels with excellent hydraulic performance and an application method thereof, which are mainly used to ensure the hydraulic design quality of the water outlet channels of large and medium-sized inclined shaft extension pump devices. Background technique [0002] The oblique shaft extension pump device with inclined pump shaft is applied to large and medium-sized pump stations with a net head of (1-4) m. Increase, the inclination angle of the pump shaft should generally not be greater than 40°. The series of inclined water outlet channels are used in conjunction with the inclined shaft extension pumps. Its function is to guide the water flow to turn and spread in an orderly manner during the process of flowing from the outlet of the pump guide vane body to the outlet pool, so as to reduce the w...

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Problems solved by technology

In order to meet the requirements of the pump shaft passing through the top of the flow channel, the oblique water outlet channel needs to be bent in an "S" shape. Due to the strong influence of centrifugal force, the flow state in the flow channel is very complicated.

The traditional hydraulic design method of the outlet channel adopts the "average velocity method" based on one-dimensional theory, which is very different from the actual three-dimensional turbulent flow in the inclined outlet channel. The designed outlet channel cannot guide the water flow to turn in an orderly manner and spread smoothly , and even cause vortices in the flow channel, resulting in unstable water flow and large head loss, which seriously affects the safe, stable and efficient operation of the pumping station

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