A series of inclined water inlet channels with excellent hydraulic performance and its application method

Abstract

The invention discloses a series of inclined water inlet 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 inlet 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 inlet 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 inlet flow passages of the pump station. The flow passages after conversion are orderly in water flow direction, uniform in shrinkage, little in head loss and excellent in hydraulic performance. The series of inclined water inlet 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 inlet channels with excellent hydraulic performance and an application method thereof, which are mainly used to ensure the hydraulic design quality of the water inlet channels of large and medium-sized inclined shaft extension pump devices. Background technique [0002] The inclined 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. The inclination angle of the pump shaft of the inclined shaft extension pump device relative to the horizontal plane increases with the increase of the net head of the pump station. Increase, the inclination angle of the pump shaft should generally not be greater than 40°. The inclined water inlet channel is used together with the inclined shaft extension pump. Its function is to guide the water...

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Problems solved by technology

The traditional hydraulic design method of the inclined inlet channel adopts the "average velocity method" based on one-dimensional theory. The results obtained by this method are quite different from the actual three-dimensional turbulent flow in the inclined inlet channel. The designed inlet channel cannot meet the The requirements of the pump impeller on the inlet flow field of the impeller chamber seriously affect the safe, stable and efficient operation of the pump station

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