Detachable cryogenic liquid cavitation flow observational test section

Abstract

The invention relates to a detachable cryogenic liquid cavitation flow observational test section, which belongs to the technical field of fluid mechanical engineering, cryogenic engineering and aerospace engineering. The detachable cryogenic liquid cavitation flow observational test section comprises temperature sensors and pressure sensors, wherein the temperature sensors and the pressure sensors are installed on a runner lower panel through installation holes; the runner lower panel is in contact connection with a pipeline inside a basic runner through a notch at the lower part of the basic runner, and is fixedly connected on the basic runner through a pressing gasket; a visual observation window is formed in a notch at the upper part of the basic runner, and two buffer gaskets are installed on both sides of the visual observation window separately; a connecting bayonet is fixedly connected on the basic runner; and both sides of the basic runner are provided with flange plates. The detachable cryogenic liquid cavitation flow observational test section is assembled by adopting a plurality of parts, is simple in structure, has few components, greatly reduces cost when compared with an integrated visual test section made of glass materials entirely, is convenient in detachment and installation, and is not prone to damage during the detachment and installation process.

Description

technical field [0001] The invention relates to a cavitation test device, in particular to a detachable low-temperature liquid cavitation test section, which belongs to the technical fields of fluid mechanical engineering, cryogenic engineering and aerospace engineering. Background technique [0002] When the internal partial pressure of the liquid at a certain temperature is reduced to the saturated vapor pressure of the liquid, vaporization will occur, and the gas dissolved in the liquid will also precipitate out to form bubbles (also known as voids, cavities). After the flow moves to a place of higher pressure, the vapor in the bubble recondenses and the bubble collapses. The process of the generation, development, and collapse of cavitation in this liquid flow, as well as the resulting series of physical and chemical changes, are called cavitation. The occurrence of cavitation often leads to a decrease in machine efficiency and causes problems such as vibration, noise, ...

AI Technical Summary

Problems solved by technology

However, its outstanding disadvantage is that it is difficult to drill holes on the wall of the circular pipe to arrange pressure and temperature sensors. Even if the sensors are successfully arranged on the wall, due to the flow characteristics of the Venturi tube, the cavity generated in the test section will only be in the center of the pipe. If the flow does not adhere to the pipe wall, the sensor cannot measure the pressure and temperature inside the cavity

Another outstanding shortcoming is that, for circular glass tubes, the pictures taken by the high-speed camera need to be converted to the transmission light path to obtain accurate data, which increases the difficulty of post-processing of test data

[0006] At the same time, the above-mentioned test sections all have the problems of easy damage and inconvenient replacement.

First of all, every disassembly process must be very careful, it is very likely to cause damage to the glass test section

Then, if you want to use test sections with different geometric dimensions for testing, you can only reprocess the entire test section, which requires a lot of financial and manpower

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