Anti-impact wear resistance test device for high speed silt-carrying water flow water conservancy engineering material

Abstract

Characters of the test unit are that the test unit is composed of feeding reservoir, water pump, motor, nozzles of water flow, mechanism of adding sand, bracket for test piece, sand basin, and flowmeter. Water pump is connected to motor. Through pipes, feeding reservoir, pump, control valve, and nozzle is connected in sequence. Nozzle is extended to sand basin. Mechanism of adding sand is located above exit of nozzle. The bracket for test piece is positioned in front of the nozzle of water flow in sand basin. The flowmeter is on outlet pipe of the sand basin. Since test section being as free flow, the invention obtains condition of experiment including synthetical ablation, cavitation corrosion, and aeration more near to engineering practice. Features are: simple structure design, easy of manufacturing, easy of adjusting water flow and sediment concentration, wide application, reaching to 50m / s of maximum flow rate, and no ablation on nozzle.

Description

technical field [0001] The invention belongs to the technical field of engineering material abrasion characteristic test devices, and in particular relates to a high-speed sand-laden water flow hydraulic engineering material anti-shock and wear resistance test device. Background technique [0002] In the construction of water conservancy projects, the flow velocity is one of the decisive factors affecting the abrasion of the flow surface layer of the drainage building materials. When the water flow velocity is below a certain critical flow velocity, it will generally not cause obvious wear and tear to the drainage structure. However, when the flow rate is gradually increased above this critical point, the wear on the material will increase sharply. For example, the wear test in the metal material laboratory shows that the relationship between the amount of wear and the velocity of water flow is 2.7 to 3.2 powers. In water conservancy projects, when the flow rate is relativ...

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Problems solved by technology

[0005] Although the test equipment of the water tunnel type is parallel to the abrasive surface of the material during the test, and the air-entrained water flow can be formed by setting the vent holes, the water flow conditions are relatively close to the water flow conditions in the drainage structure, but due to the high-speed content The abrasiveness of the sandy water flow is very strong. When the flow rate is too high, it will cause serious abrasion to the jet nozzle, which limits the speed of the sandy water flow in the test. For example, the flow rate in the test of Wang Shixia et al. can only reach 30m / s (Wang Shixia, Aeration and anti-wear characteristics of high-speed sand-laden water flow, drainage engineering and high-speed water flow, No. 2, 1994), this is in line with the high-speed or super-high-speed water that has or will appear in my country's actual projects such as Ertan, Xiluodu, Jinping and other hydropower stations. Compared with high velocity (50m / s and above), it is relatively small

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