Research On Energy Release Law In Electrostatic Discharge Process

Electric ignition is a common ignition mode during production and our daily life. It was also widely applied in military, chemical and other industries. Studying on the energy output structure and energy release laws during the process of electric spark discharge has great contribution to the relevant production and life,and it can provide certain theoretical basis and data support.In this paper, multilevel electrostatic ignition device was designed on the basis of small energy electric spark discharge device. The whole test system includes the ignition system, the voltage and current test system, the overpressure test system, schlieren test system and other equipments. The relationship of total release energy, spark energy and blast wave energy under energy gears of 10 J, 100 J, 1000 J in electrostatic discharge process was mainly measured. The energy output structure and release law are analyzed also.It can be found that curves of voltage and current conform to cyclical change of attenuation in electrostatic discharge process of different energy gears. Most of the energy in the process of spark discharge consumed in the circuit(mainly the wires and switch), only a small part turned to spark energy. Then spark energy can be simplified as two forms of heating and blast wave. For the general small energy ignition, heating plays a key role, the influence of blast wave can be neglected. However, for the high-energy ignition as the application of direct initiation of detonation experiments, the transfer rate of heat is less than the propagation rate of blast wave, blast wave plays the key role. Blast wave energy was also a small part of spark energy. This paper determined the spark energy calculation method of conservation law and the blast wave energy calculation method of schlieren trajectory. Through calculation, it can be found that the total release energy, spark energy and blast wave energy increased with the increase of charging voltage. Spark energy accounts for 7.7%-14.1% during the total release energy, and about 4.4%-19.7% of spark energy turned into blast wave energy. With the increase of energy gear, the ratio of total release energy converted to spark energy increased, while the efficiency of spark energy turned into blast wave energy decreased. This paper obtained the conversion relation of total release energy, spark energy and blast wave energy under the experimental condition. The energy output structure and release law in electrostatic discharge process were also analyzed.Electrostatic discharge is closely related to the industrial electrical safety. The research results in this paper has important theoretical significance and reference value for the effectively use of spark energy and the calibration of spark energy, blast wave energy.