Rotating scaling type abrasion-cavitation erosion coupling test method and device

Abstract

The invention relates to a rotating scaling type abrasion-cavitation erosion coupling test method and device. The test method comprises the following steps: manufacturing the inner edge of a tested piece into a bulge, placing the bulge in a sealed abrasion-cavitation erosion chamber and forming a scaling type flow channel by matching the bulge with a rotating impeller in the abrasion-cavitation erosion chamber; filling water flows containing sands; starting a rotating driving motor and a water circulating pump, spraying the water flows containing sands from a hollow blade and rotating and flowing at a high speed; forming rushing-abrasion damage and cavitation erosion damage to the surface of a concrete tested piece; after testing, taking out and weighting the tested piece and measuring anabrasion depth; and discharging the water flows containing sands. The abrasion-cavitation erosion coupling test device is provided with the abrasion-cavitation erosion chamber, wherein a rotating water-sand spraying impeller with a hollow structure is arranged in the abrasion-cavitation erosion chamber; the bulge of the inner edge of the tested piece is matched with the rotating impeller; and thescaling type flow channel is formed in the abrasion-cavitation erosion chamber. The test method and device can be used for testing the abrasion-cavitation erosion resisting capability of concretes under the abrasion-cavitation erosion coupling action of the high-speed water flows containing sands and have the advantages that the maximum flow speed reaches 40m/s-60m/s, the occupied area is small, the rushing-abrasion efficiency is high, the energy conservation and environmental friendliness are realized.

Description

technical field [0001] The present invention relates to a test method and instrument, more specifically, a rotating scaling type abrasion-cavitation coupling test method for testing the resistance of concrete to high-speed sandy water flow, and the equipment used in the method. Background technique [0002] Under the action of high-speed sandy water flow, hydraulic concrete is often damaged by abrasion and cavitation erosion (also known as cavitation erosion) at the same time, and the damage is serious. Abrasion refers to the material damage caused by the friction and wear between the abrasive medium and the material under the action of high-speed water flow containing the abrasive medium; cavitation erosion refers to the vaporization of the water flow when it encounters a sudden drop in pressure. It is called cavitation, and the cavitation formed by cavitation in water is called "cavitation". When the cavitation collapses, it generates a large instantaneous pressure. The e...

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Problems solved by technology

However, another paper by the inventor of this patent pointed out that no cavitation phenomenon occurred in terms of the characteristics of the wear surface when using this device for testing; and its data showed that the maximum wear amount of concrete with a strength grade of C50-C55 in 12 hours 33g, equivalent to every m 2 It takes about 7 hours to wear 1kg of concrete (Deng Jun, Xu Weilin, Diao Mingjun, etc., 50m / s flow velocity level sandy water abrasion experiment, 2005 Progress in Hydraulics and Hydraulic Informatics, The Second National Academic Conference on Hydraulics and Hydraulic Informatics, 2005 October 15, Chengdu, China Hydropower Engineering Society), which shows that its wear efficiency is still low, which may be due to the fact that its water flow direction is basically parallel to the surface of the test piece

[0011] At the same time, the existing test methods and instruments that can simultaneously test the performance of concrete against abrasion-cavitation coupling have defects such as large size of the device and high power consumption.

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