An experimental device and method for high-temperature molten metal droplet impacting a wall in a negative pressure environment

Abstract

The invention discloses a visualization experiment device and method of wall collision of high-temperature molten metal droplets in a negative pressure environment. The experiment comprises: an air flotation damping experiment table, a metal droplet generation system, a temperature controllable wall surface system, an environment pressure adjustment system, an automatic trigger high-speed camera system and an image analysis system. The metal droplet generation system generates metal droplets; the environment pressure adjustment system realizes the precise control of the environment pressure within a greater negative pressure range when the droplets collide the wall surface; and the automatic trigger high-speed camera system records an image when the droplets collide the wall surface, and finally, the image analysis system performs quantitative analysis on a video to provide accurate physical variables such as a droplet speed, a droplet diameter, a spreading radius, a height and deformation characteristics. By adoption of the experiment method, the metal droplets can be generated in the negative pressure environment, and an experiment scheme is provided for the mechanism research ofthe movement characteristics when the metal droplets collide the wall surface. The method is simple in operation, safe and reliable in process, and wide in experiment research application value.

Description

technical field [0001] The invention belongs to the field of two-phase flow experiments and tests, and in particular relates to a visual experiment device and method for high-temperature molten metal droplets bumping against a wall in a negative pressure environment. Background technique [0002] With the deepening of the exploration of space, many scholars are very interested in the difference between common physical phenomena occurring in the atmospheric environment and in the space negative pressure environment. The phenomenon of gas-liquid free interface flow has always been a research hotspot in two-phase flow, and the typical physical phenomenon is the deformation flow of liquid droplets hitting the solid wall. In the atmospheric environment, droplets are often accompanied by phenomena such as adhesion, splashing, and rebound after hitting a wall. Different motion phenomena will affect the impact force of droplets on solid walls and the combustion calorific value of li...

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Problems solved by technology

[0003] At present, the most commonly used experimental measurement technology for droplets colliding with walls is high-speed photography. Patent CN106228875A discloses "A Visual Experiment Platform for Droplets Colliding with Liquid Films and Its Application Method". The device uses a syringe pump and a stainless steel needle tube to manually generate water droplets. , can continuously produce droplets of different types, different diameters, and different dropping speeds, but this device cannot be used for high-temperature molten metal droplets, such as tin and aluminum

In addition, the device can only be tested in a normal temperature and pressure environment, and cannot be carried out in a closed box

Patent CN107389300 discloses a high-temperature melting micro-droplet collision device and method. In the device, the metal droplet uses an electromagnetic induction heater to heat a double-chamber graphite crucible, and the droplet is driven by a high-pressure gas cylinder to generate gas; the high-temperature and high-pressure environment adopts induction heating The pressure can be adjusted from 1-6MPa; the high-pressure container of the device is a right-angled square cavity. Considering that the negative pressure and positive pressure containers have great differences in the direction of pressure and processing, Therefore, when the vacuum is high, the middle part of the right-angle square cavity plate will be greatly deformed, causing a huge safety hazard; in addition, the double-chamber graphite crucible in this device is fixed on the top of the high-pressure vessel, which cannot realize the control of the impact velocity of the metal droplet. At the same time, the temperature of the experimental wall is normal temperature, and there is no temperature control device.

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