RU1809552C - Electrostatic discharger - Google Patents

Abstract

Electrostatic discharge. Use: to remove electrostatic charge from the surface of an aerospace aircraft. SUBSTANCE: corona tip is installed in a cylindrical cavity of an insulating housing with a recess relative to the end of the housing. The ratio of the diameter of the body cavity to the depth of the hole is selected in the range from 7 to 10. 1 sludge.

Description

The invention relates to space technology and is intended to remove electrostatic charge from the surface of an aerospace aircraft.

The aim of the present invention is to expand the scope by preventing the destruction of the corona tip by the heat flux and reducing the level of electromagnetic interference.

The drawing shows an electrostatic discharge design.

The electrostatic discharge contains a fixing unit 1, an insulating body 2 with a cavity 3 at its working end, and a corona electrode made in the form of a point 4.

At hypersonic speeds around the aerospace plane at altitudes characterized by the maximum level of aerodynamic heating of the aerospace plane, taking into account the influence of flow viscosity is significant throughout the flow zone on the leeward side, including regions of separated flows. At characteristic Reynolds numbers determined by local flow parameters at the end edge of the cavity and cavity sizes not exceeding Re 50-100, the heat flux to the walls of the cavity does not exceed the heat flux to the main surface (in the absence of a cavity) and corresponds to the maximum radiation-equilibrium temperature order + 640 ° C. From this condition, the permissible dimensions of the cavity are determined under the conditions of maximum heating / The transverse size (diameter) of the cavity L is chosen to be less than or equal to 10 mm.

At subsonic and low supersonic flight speeds in the lower atmosphere in the zone of operation of the electrostatic discharge, the level of electromagnetic interference generated by the corona discharge substantially depends on the depth d of the corona tip. With an increase in the depth of the needle (a decrease in the ratio of L to d), the level of electromagnetic interference sharply increases due to the electrification of the inner surface of the cavity. The optimum ratio of L to d is in the range of 7 to 10.

Flowing through a corona discharge from a corona tip is charged. The highly conductive region resulting from ionization of the air by a corona discharge forms in the shadow zone

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of a plane of an aerospace aircraft, a volume charge. The latter is continuously carried away into the atmosphere by a vortex flow from the shadow zone of the so-called Karman vortex path, which prevents a decrease in the efficiency of the electrostatic discharge, preventing a decrease in the steepness of its coulampere characteristic.

Claims (1)

SUMMARY OF THE INVENTION An electrostatic discharge device comprising an insulating body with a cylindrical cavity at the working end in which a corona electrode is mounted is completed in the form of a point and electrically connected to a fastening assembly fixed on the indicated body, characterized in that, in order to expand the scope of application, by preventing destruction of the corona tip under the influence of heat flux and to reduce the level of electromagnetic interference, the tip of the corona tip is recessed into the cavity of the housing relative to the working end of the body, and the ratio of the diameter of the cavity of the body to the depth of the peaks of the corona tip is selected from 7 to 10.