Method for acquiring electro-hydraulic pulse shock wave intensity under high static pressure

Abstract

The invention discloses a method for acquiring electro-hydraulic pulse shock wave intensity under a high static pressure. An electro-hydraulic pulse shock wave emitter performs gap discharge on liquidthrough a pulse capacitor, and shock waves are outwardly radiated through quick expanding of a cavity and electric arc. The electro-hydraulic pulse shock wave emitter normally operates in deep sea orland environments, the static pressure around the electro-hydraulic pulse shock wave emitter is increased along with increasing of operating depth, and the shock wave intensity is largely different from that under a normal pressure due to influences of static pressure in a discharge process. A shock wave generation process includes a prebreakdown process and a main discharge process, and energy loss in the prebreakdown process is calculated according to a relationship of variation of prebreakdown delay along with the static pressure. Influences of the static pressure on liquid density, shockwave propagation speed and cavity expanding rate are considered on the basis of the fluid mechanics equation, energy deposition of arc channels under different static pressures is calculated, and inversion of efficiency in conversion of electric energy into mechanical energy in the main discharge process is realized. Further, by integrating of the two processes, the relationship of variation of shock wave intensity along with the static pressure is obtained.

Description

technical field [0001] The invention belongs to the field of high-voltage technology and pulse power technology, and more specifically relates to a method for obtaining the strength of a hydraulic pulse shock wave under high static pressure. Background technique [0002] The high-voltage pulsed arc discharge in the liquid will radiate high-intensity pulsed shock waves along the expansion direction during the rapid and violent expansion of the arc. This phenomenon is called "hydraulic effect". Today, this effect has been widely used in fields such as oil and gas stimulation, shock wave lithotripsy, electrohydraulic forming, and underwater sound sources. [0003] With the wide application of hydroelectric pulse shock waves in fields such as oil and gas stimulation and underwater sound sources, high static pressure in deep ground and deep sea environments has become one of the main bottlenecks restricting the application of hydroelectric pulse shock waves. Generally, the hydro...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the present invention provides a method for obtaining the shock wave intensity of the hydroelectric pulse under high static pressure, aiming at solving the problem of the shock wave intensity of the hydroelectric pulse under the condition of high static pressure in the prior art through test means. Problems with technical difficulties in measuring

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