Experiment apparatus, based on Marx generator, for electric spark induced cavitation bubble

Abstract

The invention relates to an experiment apparatus, based on a Marx generator, for electric spark induced cavitation bubbles, and belongs to the cavitation and cavity dynamics field. A Marx generator is applied to the experiment apparatus for electric spark induced cavitation bubbles, and a step-up ratio of a transformer in a high-voltage pack is changed by the Marx generator to be 1 / n of an original step-up ratio, n being the grade of the Marx generator. The experiment apparatus comprises a Marx generator ranging from 2 to 10 in grade, ball gaps in the air, and pin electrodes in water. The size of cavitation bubbles is controlled through the distance between the ball gaps and the distance between the pin electrodes. The experiment apparatus can be used for generating cavitation bubbles adjustable in diameter, observing burst form, burst time or the like of cavitation bubbles, and also studying mutual interacting relations among cavitation bubbles and solid boundaries, solid particles, liquid levels and the like.

Description

technical field [0001] The invention relates to a technique for inducing cavitation bubbles, in particular to an experimental device for inducing cavitation bubbles by electric sparks based on a Marx generator, and belongs to the field of cavitation and cavitation bubble dynamics. Background technique [0002] Marx Generator is a high-voltage device that uses capacitors to be charged in parallel and then discharged in series. This structure was proposed by E.Marx in 1924. It is often used in tests such as insulation impact withstand voltage, dielectric impact breakdown, and discharge, such as The publication number is CN203688736U, and the title of the invention is a patent application for an insulation and dielectric shock withstand device based on a Marx generator. The Marx generator is also called an impulse voltage generator. [0003] Cavitation phenomenon, also known as cavitation phenomenon, is a phenomenon in which a local water body is violently gasified to form a g...

AI Technical Summary

Problems solved by technology

The defects of this experimental device are as follows: (1) High voltage pulses of more than 100kV are required, and the requirements for withstand voltage and insulation of its electrical devices are very high; especially the size of transformers, high-voltage silicon stacks and high-voltage capacitors is large, so the complete set of devices often requires a separate A whole laboratory is arranged; and the price is expensive

(2) The electric spark discharge is a random process, and the electric field between the needle plates is not uniform, which leads to a large dispersion of the parameters of the discharge

(3) The size of the generated cavitation bubble is affected by many parameters such as capacitor size, needle plate spacing, electrode spacing, transformer output voltage, and resistance; it is difficult to control the above parameters with existing devices, so the size of the cavitation bubble is also difficult to control

(4) The generated voltage is large, the safety is low, and there is strong electromagnetic radiation to the experimenters

(5) The high voltage and high current of the huge device generate a strong electromagnetic field, which has great interference to experimental instruments and computers and other facilities

Images