Ventilating method capable of effectively inhibiting pipeline valve cavitation erosion

Abstract

The invention relates to a method for inhibiting pipeline valve cavitation erosion, and belongs to the field of cavitation prevention of hydraulic engineering. In order to solve the cavitation and cavitation erosion problem of a water conveying valve in a hydraulic type boat lifter, the invention discloses a ventilating method capable of effectively inhibiting pipeline valve cavitation erosion. The ventilating method comprises the following steps of: designing a basic ventilating body form; obtaining ventilating amount needed for reducing cavitation through a decompression model test; arranging an air vent in an upstream water tube section of the valve according to the test results; and verifying main frequency loss generated by cavitation through a hydrophone. The method has the advantages that: firstly, ring-shaped ventilating measures are adopted, and aerification range is wide; secondly, aerification is performed before the valve, and aerification water flow passes through a valve runner and is sufficiently mixed, so that air bubbles are dispersed to be smaller, aerification amount is uniform, the air bubbles can be packaged better, and energy of air bubble collapse is absorbed.

Description

technical field [0001] The invention relates to a method for suppressing the cavitation of pipeline valves, in particular to a method for annular ventilation which is applied to pipeline valves and can solve cavitation and cavitation erosion at high flow rates. It belongs to the field of water conservancy engineering air defense. Background technique [0002] The liquid will boil under the condition of normal pressure and high temperature (reaching the boiling point), and bubbles will be precipitated. Under the conditions of normal temperature and low pressure, once the internal pressure of the fluid is lower than its saturated vapor pressure, bubbles will also be precipitated, and the bubbles will move to the high-pressure area and collapse rapidly under the action of external pressure. Fill the cavity, instantly produce a very strong water hammer, and hit the metal surface with a high impact frequency. The impact stress can reach hundreds to thousands of atmospheres, and ...

AI Technical Summary

Problems solved by technology

But how to incorporate the gas into the fluid is a complex problem

Although the gas is passed into the fluid due to an inappropriate ventilation method, the gas quickly merges into large bubbles in the fluid, which cannot play a role in corrosion reduction

Therefore, the ventilation method of the prior art cannot effectively solve the cavitation cavitation problem of the water delivery valve in the hydraulic ship lift.

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