Unsteady cavitation flow-excited vibration multi-field synchronous measurement system for water tunnel experiment

A measurement system and unsteady technology, applied in the fields of water conservancy and hydropower engineering, ship and underwater vehicle engineering, can solve the problem that the transient flow field shape and structural field vibration characteristics cannot be obtained at the same time, and achieve space saving and low cost. Effect

Inactive Publication Date: 2018-04-13
TSINGHUA UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the current experimental method using a single measuring device cannot simultaneously obtain the transient flow field shape and the vibration characteristics of the structural field in the unsteady cavitation flow-induced vibration phenomenon. Unsteady cavitation flow-induced vibration multi-field synchronous measurement system

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  • Unsteady cavitation flow-excited vibration multi-field synchronous measurement system for water tunnel experiment
  • Unsteady cavitation flow-excited vibration multi-field synchronous measurement system for water tunnel experiment
  • Unsteady cavitation flow-excited vibration multi-field synchronous measurement system for water tunnel experiment

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Embodiment 1

[0029] A multi-field synchronous measurement system for unsteady cavitation flow-induced vibration for water tunnel experiments, including: an experimental section 1, an experimental model 2, a high-speed camera 3, a synchronous trigger switch 4, a laser Doppler vibrometer 5, and a data acquisition instrument 6. Data processing system / computer with display 7 and light source 22, such as figure 1 shown.

[0030] The experimental section 1 is a transparent cuboid structure with a length of 700mm, a width of 70mm, and a height of 190mm. It is installed between the contraction section 14 and the diffusion section 15 of the circulating cavitation water tunnel test platform. The direction of water flow is from the contraction section 14 to the expansion section. paragraph 15;

[0031] The circulating cavitation water tunnel experiment platform mainly includes a water inlet pipe 18, a contraction section 14, an experiment section 1, a diffusion section 15 and a return pipe 16, as ...

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Abstract

The invention relates to an unsteady cavitation flow-excited vibration multi-field synchronous measurement system for a water tunnel experiment and belongs to the ship and underwater vehicle engineering and water conservancy and hydropower engineering technology field. The system is composed of an experimental section, an experimental model, a high-speed camera, a synchronous trigger switch, a laser Doppler vibration meter, a data acquisition instrument, a data processing system/computer and display assembly and a light source. According to the system of the invention, rising edge voltage signals are generated through the synchronous trigger switch, trigger signals are controlled by using the voltage signals, and therefore, the signal acquisition starting instructions of the high-speed camera and the laser Doppler vibration meter are controlled quantitatively and precisely, and the quantitative and accurate synchronous measurement of an unsteady cavitation flow field and a structure field can be realized; and data obtained through multi-physical field synchronous acquisition are subjected to preprocessing, time-domain analysis, frequency-domain analysis and time-frequency analysis,and therefore, reliable analysis experimental data can be provided for the study of fluid-structure interaction characteristics.

Description

technical field [0001] The invention relates to an unsteady cavitation flow-induced vibration multi-field synchronous measurement system for water tunnel experiments, belonging to the technical fields of ship and underwater vehicle engineering and water conservancy and hydropower engineering. Background technique [0002] Cavitation is a phase transition phenomenon that occurs when the local pressure inside the liquid drops to the saturated vapor pressure of the liquid. The occurrence of cavitation often leads to a series of problems such as structural surface damage, system efficiency reduction, structural vibration, and noise. Among them, unsteady cavitation-induced vibration is a core key technical issue related to underwater weapons, underwater launch, aerospace and other national defense industries. The fluid-solid coupling effect in a complex hydraulic environment will lead to significant changes in the dynamic characteristics of the system, which are closely related t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M10/00
CPCG01M10/00
Inventor 吴钦刘明徐昀曹树良
Owner TSINGHUA UNIV
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