Flow-induced vortex amplification frequency experiment apparatus

Abstract

The invention provides a flow-induced vortex amplification frequency experiment apparatus comprising a flow-induced test pipeline, a honeycomb device, an axial-flow pump motor 5, a flow velocity measuring instrument, a water density cover plate, a water filling opening, an air exhaust opening, a water density piston, a pressure gauge and a vibration accelerometer, wherein the pressure gauge and the vibration accelerometer are arranged on a test piece; the flow-induced test pipeline comprises a non-test zone pipeline and a test zone pipeline; the water filling opening and the air exhaust opening are arranged above the non-test zone pipeline, one face of the test zone pipeline is provided with a square hole, a detachable water density cover plate is mounted on the square hole, the flow velocity measuring instrument is arranged on a front end of an upper wall face of the test zone pipeline, the axial-flow pump motor is arranged on an outer part of the flow-induced test pipeline, an output end of the axial-flow pump motor is connected with a water density axial tube, and an end part of the water density axial tube extends into the non-test zone pipeline and is provided with an axial-flow pump blade; the honeycomb device is arranged on a part, positioned between the axial-flow pump blade and a sudden contraction segment, of the non-test zone pipeline. The flow-induced vortex amplification frequency experiment apparatus can be used for testing flow-induced vortex amplification frequency of the test piece; the flow-induced vortex amplification frequency experiment apparatus is low in cost, wide in application range, simple in structure and convenient in operation.

Description

technical field [0001] The invention relates to a flow-induced vortex discharge frequency experiment device, which belongs to the field of component vibration parameter measurement. Background technique [0002] When the fluid contacts the component at a certain rate, the fluid front is hindered by the component to generate a high-pressure area, which will extend downward along both sides of the component and separate at the maximum cross-sectional width. After the fluid is separated, backflow occurs along the surface of the structure. Backflow causes the original fluid boundary layer to separate from the surface of the component, forming a free shear layer extending downstream and a wake region sandwiched between the two shear layers. Since the shear layer is in contact with the peripheral free flow zone, the velocity will be greater than that of the internal wake zone, and the fluid will first generate some periodic vortices and then disperse. When the vortex leaves the co...

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Problems solved by technology

Both patents 1 and 2 belong to the vortex-induced vibration experimental device of pipe fittings in a large towing pool, and there are great differences from this patent in terms of principle, device structure and application range.

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