Deep-sea riser segmented model forward flow forced vibration experimental device under action of uniform flow

Abstract

The invention is suitable for the field of ocean engineering and provides a deep-sea riser segmented model forward flow forced vibration experimental device under the action of uniform flow. The deep-sea riser segmented model forward flow forced vibration experimental device comprises a deep-sea riser module, end part false body modules, a fixing module, a sliding module and a measurement analysis and control module, wherein the two ends of the deep-sea riser module are connected with the end part false body modules respectively; the fixing module is connected with the end part false body modules and the sliding module respectively; the sliding module is fixedly connected with the bottom of one end of a trailer truck; and the measurement analysis and control module is arranged on the trailer truck, and is connected with the deep-sea riser module, the end part false body modules and the sliding module respectively. The invention aims to solve the problems that the conventional experimental device can only be used for simulating sea conditions with low Reynolds numbers and boundary treatment is not performed on riser segments; a riser model with an appropriate slenderness ratio is selected, so that the practical Reynolds number of 106 can be reached, and the scale effect is avoided effectively; and a flow field is simulated through false bodies, so that the problem of boundary effects on both sides of the model is solved.

Description

technical field [0001] The invention belongs to the field of marine engineering, and in particular relates to an experimental device for forced vibration along the flow of a deep-sea riser section model under the action of a uniform flow. Background technique [0002] The risers in the actual marine environment are all slender and flexible structures, which will generate vortex-induced vibrations under the action of ocean currents. This kind of vibration is self-excited for the whole riser; but if considering that each section can be regarded as a segment of a rigid body, then this kind of vibration is a forced oscillation. Since each small part of the flexible riser can be regarded as a rigid cylinder, if we want to study the vortex-induced vibration characteristics of the slender flexible marine riser under the action of the ocean current in the real environment, we can start with the simple microscopic problem, namely The force, motion response, and wake shape of a rigid...

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Problems solved by technology

[0004] The present invention aims at the technical problems existing in the above-mentioned prior art, and provides a deep-sea riser section model downstream forced vibration experiment device with uniform flow, aiming to solve the problem that the existing test device can only simulate low Reynolds number sea conditions, and there is no The problem of boundary processing for riser segments avoids the influence of scale effect and boundary effect on experimental results

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