Method for lowering water conveying pipe head losses

Abstract

The invention provides a method for lowering water conveying pipe head losses. An antifriction material is attached or coats the inner wall of a water conveying pipe. The antifriction material is a sharkskin simulating antifriction material or a nanometer super-hydrophobic material. The sharkskin simulating antifriction material can be directly stuck to the surface of the water conveying pipe, the surface of the water conveying pipe can also be coated with a substrate material layer at first so as to improve the bonding force between the sharkskin simulating material and the pipe wall; the surface of the water conveying pipe can be coated with the nanometer super-hydrophobic material directly and can also be coated with a substrate material layer at first so as to improve bonding force between the nanometer material and the pipe wall. The nanometer super-hydrophobic material can be mixed with the nanometer antifriction material for use so as to achieve the purposes of lowering frictional resistance and resisting corrosion; the method can lower the adhesive power and flow resistance of the solid-liquid surface, the hydrophobic performance of the surface of the water conveying pipe is effectively improved, and linear losses in the pipe water conveying process are reduced.

Description

technical field [0001] The invention relates to the technical fields of water conservancy and hydropower engineering, hydrology and water resources engineering, and water environment engineering, in particular to a method for reducing water head loss of a water delivery pipeline. Background technique [0002] Hydropower is an important means of converting water energy into electrical energy and obtaining electricity. The installed capacity of my country's hydropower stations has reached 300 million kilowatts (300,000 MW), accounting for 27% of my country's total power generation, and occupies an important position in my country's energy structure. [0003] Most hydroelectric power generation requires the use of water diversion pipes to lead water from the reservoir to the hydroelectric generator. The long-term distance of the water diversion pipe to the reservoir is between tens of meters and several kilometers, and the pipe diameter and water flow in the pipe vary depending...

AI Technical Summary

Problems solved by technology

However, the coating of superhydrophobic materials in the existing water pipes only stays in the experimental stage. The diameter of the pipes is small, and the pipes are mainly made of metal pipes and plastics. The water flow rate is usually between 5 and 20m / s

With the implementation of projects such as the South-to-North Water Diversion Project, large-scale high-head hydropower stations have begun to be constructed one after another. Most of the water delivery pipelines used in high-head hydropower stations such as pumped storage are large-diameter and concrete pipes, which have higher surface energy and greater resistance to water flow. , while the maximum discharge velocity of high-head hydropower stations can reach 50m / s. According to the formula, it can be seen that the head loss will increase rapidly with the square of the flow velocity, resulting in greater energy loss

Therefore, the establishment of high-head hydropower stations puts forward higher requirements on the drag reduction performance and hydrophobic performance of materials, and the existing technologies for reducing head loss cannot be applied to the requirements of reducing head loss in high-head hydropower stations.

Images