Spraying nozzle cavitation flow nanosecond flash imaging test device and method

Abstract

The invention discloses a spraying nozzle cavitation flow nanosecond flash imaging test device and method. The spraying nozzle cavitation flow nanosecond flash imaging test device comprises a test system and a pipeline system. The test system comprises a common-rail control system, a computer, a first CCD camera, a second CCD camera, a synchronizer and a nanosecond white illuminant flashing system. The pipeline system comprises a liquid storage tank, a filter, a high-pressure pump, a common-rail pipe, a pressure meter and a transparent spraying nozzle which are sequentially connected through pipelines, wherein a heating element and a cooling fan are arranged on the liquid storage tank, the high-pressure pump is connected with a motor, a flow outlet pipeline of the common-rail pipe is respectively connected to the common-rail control system and the transparent spraying nozzle, and the pressure meter is arranged on the connecting pipeline of the common-rail pipe and the transparent spraying nozzle. The spraying nozzle cavitation flow nanosecond flash imaging test device and method can effectively obtain the process of generation, development and death of nanosecond vacuoles, the heating element, the cooling fan and a temperature sensor are installed in an oil tank, the temperature of fluid can be controlled in real time through a control panel, and conditions are provided for research of cavitation flow of fluid in the spraying nozzle at different temperatures.

Description

technical field [0001] The invention relates to the fields of aerospace, national defense, navigation, chemical industry, water conservancy machinery, diesel engine fuel spray, etc. It can be used for the experimental research of cavitation flow in multiphase flow, especially a test device for the study of the characteristics of cavitation two-phase flow inside the nozzle and method. Background technique [0002] Cavitation is that under certain ambient temperature conditions, when the local absolute pressure in the fluid medium drops to the saturated vapor pressure at the local temperature, the gas dissolved in the fluid will be released, and at the same time the fluid will vaporize to produce a large number of cavitation bubbles. , when the air bubbles flow with the fluid further, when the surrounding pressure increases, the volume will shrink sharply until it collapses, thereby causing damage to the surface of the material. For a long time, cavitation has seriously affec...

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Problems solved by technology

[0003] However, there is a difficulty in studying the cavitation flow in the nozzle: the occurrence, development and collapse of the cavitation process has its own cycle, which is an unsteady process, and its own development cycle is about 10-7 seconds. In order to study its own In the process of development, the shooting interval of two photos needs to be nanoseconds, and the shooting frequency of existing high-speed digital cameras basically cannot meet the above requirements.

At present, there is no test device for this test in China. The structure of the whole test device is as follows: figure 1 shown

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