A method for measuring and calculating the horizontal distance of fluid picking out and its application

Abstract

The invention discloses a fluid cantilever-out horizontal distance measuring and calculating method and application thereof. The measuring and calculating method includes the steps of calculating thesand contained in fluid volume by determining the fluid volume weight and the volume weight of the solid substance in the fluid, calculating the fluid Froude number of a fluid cantilever-out point bydetermining the flow depth and the flow speed of the fluid cantilever-out point, calculating the correction coefficient of the fluid cantilever-out horizontal distance according to the sand containedin the fluid volume and the fluid Froude number of the fluid cantilever-out point, and finally calculating the fluid cantilever-out horizontal distance according to the correction coefficient of the fluid cantilever-out horizontal distance. The method is suitable for fluids of different-properties such as clear water, sand-containing water flow and debris flow, and can be used for reasonably determining the fluid cantilever-out horizontal distances for water of different properties, different cantilever-out point fluid flow depths, different fluid cantilever-out speeds, different fluid cantilever-out angles, different cantilever-out point fluid vertical depths, and different heights from the cantilever-out points to the downstream bed surfaces. The calculation method is simple, convenientand effective, and meets the requirements of actual engineering.

Description

technical field [0001] The invention relates to a fluid pick-up horizontal distance measurement method suitable for fluids with different properties, and its application in water conservancy and hydropower pivot projects, water and soil conservation projects, and mud-rock flow prevention and control projects. Background technique [0002] Among the debris flow prevention and control measures, sand control dams and drainage channels have the characteristics of good control effect, simple construction and maintenance, long service life, and high cost-effectiveness ratio. They are currently the most widely used engineering measures in debris flow prevention and control practice. [0003] With the large-scale implementation of sand control dams and drainage channels, many new engineering practical problems have been encountered. For example, when a sand check dam is used to carry out engineering treatment of a debris flow ditch, in order to ensure the safety of the sand check da...

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Problems solved by technology

[0004] At present, the water conservancy industry standard of the People's Republic of China "Code for Design of Concrete Gravity Dams" (SL319-2005) clearly specifies the horizontal span of the water tongue The formula has been verified by a large number of clean water laboratory test data and actual engineering data, and the calculation effect is good, but the formula is only for clean water, and for sandy water flow and debris flow, due to the high solid content in the fluid and the large volume of sand content, the fluid The bulk density can be up to 2-3 times that of clear water, and the physical properties of the fluid itself have changed significantly. If this formula is still used to calculate the horizontal pick-up distance of the flow tongue of sandy water flow and debris flow, the calculated value is usually too large, and there are large gaps in practical applications. question

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