Water-cooling adjustable compensation hot cathode device

Abstract

The invention discloses a water-cooling adjustable compensation hot cathode device. The device comprises a water-cooled electrode mounted on the central axis of the multiple electrodes, a position adjusting device for adjusting the position of the water-cooled electrode extending into the multiple electrodes, and a rotary air inlet device mounted at the front part of the water-cooled electrode. A lanthanum tungsten electrode in the device is inserted into the center of a multi-electrode, electrode cooling is achieved through a water cooling device connected with the tail in a sealed mode, the inner length extending into the multi-electrode is adjusted through a position adjusting device, and rotary shunting of high-pressure argon is achieved through matching of spiral notch grooves evenly distributed in the circumferential surface of the front section of the lanthanum tungsten electrode and a ceramic cylinder. Under the combined action of water cooling, argon protection and electric arc firing, the front end surface of the lanthanum tungsten electrode has a good current bearing capacity within a large temperature range below 3000 DEG C, the electrode shunting capacity of multiple electrodes under high air pressure can be improved, high-voltage, large-current and long-time stable operation of the sheet type electric arc heater is achieved, and the device is suitable for carrying out a heat protection test.

Description

technical field [0001] The invention belongs to the technical field of aerodynamic heat-resistant ground test equipment for aerospace vehicles, and in particular relates to a water-cooled adjustable compensation hot cathode device. Background technique [0002] At present, with the rapid development of hypersonic flight technology, the ground heat protection test assessment of the thermal protection system of hypersonic aircraft has put forward higher and higher requirements for the operation capability of arc heating equipment. Chip arc heater is one of the important heating equipments to realize high-power, high-enthalpy, long-term ground heat-proof test and assessment; chip arc heater is composed of nozzle, front and rear electrodes, several water-cooled annular compression sheets, intake ring And insulators assembled in series, the arc connects the front and rear electrodes, and restricts the tubular channel through the tangential air intake between the compression plate...

AI Technical Summary

Problems solved by technology

However, when the total pressure of the traditional laminated multi-electrode is above 1.7MPa, due to the high-voltage accumulation effect of the arc, it cannot effectively shunt the large current load, which limits the simulation range of the total pressure of the chip arc heater.

The high-voltage multi-electrode is improved on the basis of the traditional laminated multi-electrode. By using the combination of the shape changes in the electrode sheet, the distance between the discharge area of ​​different electrodes and the core arc can be adjusted, which can broaden the total pressure simulation range of the arc heater. However, as the inner diameter of the tail electrode piece decreases, the excitation effect of the electromagnetic field decreases, the arc rotation speed decreases, and the current carrying capacity and life of the electrode piece will decrease, which limits the high-voltage multi-electrode high-current operation capability.

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