Small-sized cavitation test device based on pressure control

Abstract

The invention relates to a cavitation and teaching test device, especially relates to a small-sized cavitation test device based on pressure control, and belongs to the technical fields of fluid machinery engineering and hydraulic and hydroelectric engineering. The device is generally divided into four parts: an operating tank part, a test section part, a collecting tank part and an auxiliary equipment part. The water inlet of the test section of the operating tank is connected with a turbine flow meter through a pipeline; a test control valve is connected with the water inlet of the collecting tank through the pipeline; the liquid reflux inlet of the operating tank is connected with the water outlet of the collecting tank through the pipeline on which a reflux control valve is arranged; a light source and a high-speed camera connected with a computer are arranged beside a visual test section and used for collecting images; a light source controller is connected with the light source and used for controlling the intensity of the light source. The different-level cavitation phenomenon can be observed clearly by the test device, and the test device is simple and portable, convenient to detach, carry and use in teaching, small in occupation space, and saved in test area.

Description

technical field [0001] The invention relates to a cavitation experiment and a teaching experiment device, in particular to a small-scale cavitation experiment device based on pressure control. It belongs to the technical fields of fluid mechanical engineering and water conservancy and hydropower engineering. Background technique [0002] For a liquid at a certain temperature, when the pressure drops to the saturated vapor pressure of the liquid, the liquid will vaporize, and the gas dissolved in the liquid will precipitate out to form bubbles (also known as voids, cavities), and when the bubbles move with the water flow to After reaching a higher pressure, the steam in the bubble recondenses and the bubble collapses. In the local area of ​​liquid flow, or due to factors such as sufficient flow velocity and boundary layer separation, pressure changes, resulting in the process of cavitation generation, development, and collapse in the liquid flow, as well as a series of physi...

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Problems solved by technology

The use of such large-scale equipment in experimental teaching will have the following disadvantages: 1. It occupies a large area and requires a lot of investment costs; 2. The experimental equipment and experimental structure are complicated. If other experiments are required, it is inconvenient to replace the test section and difficult to replace Flow medium; 3. There are many and large equipment, which makes the maintenance method complicated and expensive; 4. The experimental equipment is inconvenient to move, which hinders the teaching; 5. More resources are required and more noise and exhaust gas pollution are generated during the use process

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