Device and method for testing cavitation characteristics of materials in polymer solution

Abstract

The invention discloses a device and a method for testing cavitation characteristics of materials in a polymer solution. The device comprises a magnetostriction oscillator, a test tank filled with polymer solution test liquid and a test liquid circulating system. The testing method disclosed by the invention comprises the steps: standing the polymer solution to ensure that the polymer solution which meets a viscosity stabilizing period is poured into the test tank, and turning on the magnetostriction oscillator and the test liquid circulating system to enable the polymer solution to flow in the device in a circulating manner. According to the method, the stable characteristic of the polymer solution liquid in a process of testing the cavitation characteristics of the materials is ensured, and an influence of the polymer solutions with different concentrations at different temperatures on the cavitation characteristics of the materials can be obtained. According to the device and the method disclosed by the invention, the problem of the change of the characteristic of the polymer solution liquid in the process of testing the cavitation of the materials in the polymer solution is solved well, and in particular the problem of obvious reduction of the viscosity is solved well; moreover, a method for exploring the cavitation rules of different materials in the polymer solution is provided.

Description

technical field [0001] The invention relates to a device and a method for testing material cavitation properties, in particular to a device and a corresponding method for measuring material cavitation properties in a polymer solution. Background technique [0002] The release structure is an important part of large-scale hydropower projects, and the cavitation and erosion of the flow surface of the discharge structure caused by high-speed water flow is one of the key technical problems in the current construction of high dam projects. When the water temperature is constant and the liquid surface pressure drops to a certain critical value, or the pressure in the process of water flow is lower than a certain critical value, the gas nuclei (tiny bubbles of undissolved air and steam) in the water body will expand rapidly and form in the water. Bubbles visible to the naked eye, this phenomenon is called cavitation. When the bubbles flow through the high-pressure region with the ...

AI Technical Summary

Problems solved by technology

The magnetostrictive oscillator is an instrument widely used in laboratory tests in the world to test the cavitation characteristics of materials. Only when the physical properties of the solution are kept unchanged in the cavitation test can the stable and accurate cavitation characteristics of the material be obtained; When the polymer solution is used as the test solution, since the polymer molecules in the solution exist in the form of molecular chains, the long-term ultrasonic vibration generated by the magnetostrictive oscillator in the test will break the molecular chains, which will cause the degradation of the polymer, and the viscosity will be significantly increased. decrease; and the polymer solution will also degrade with the growth of storage time, which will change the viscosity of the polymer and affect the stability and accuracy of the test

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