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Supersonic plasma spray gun

A supersonic plasma and spray gun technology, applied in the direction of plasma, electrical components, etc., can solve the problems of short electrode life, unstable spray gun arc voltage, low jet energy density and speed, etc., to achieve low cost, long service life, jet flow stable effect

Inactive Publication Date: 2015-11-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the cathode of the existing medium-power plasma spray gun uses a conical structure, which leads to insufficient stability of the arc voltage of the spray gun and short electrode life; To reach supersonic speed, a lot of power is needed to achieve it

Method used

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Experimental program
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Effect test

Embodiment 1

[0022] When the anode inlet diameter d 1 15mm, throat diameter d 2 2.0mm, outlet diameter d 3 When the anode compression angle is 80, the Mach number Ma reaches 2.41 at the outlet of the nozzle, which meets the requirements of supersonic plasma jet.

Embodiment 2

[0024] When the anode inlet diameter d 1 15mm, throat diameter d 2 3.0mm, outlet diameter d 3 When the anode compression angle is 60, the Mach number Ma reaches 2.37 at the outlet of the nozzle, which meets the requirements of supersonic plasma jet.

Embodiment 3

[0026] When the anode inlet diameter d 1 15mm, throat diameter d 2 4.0mm, outlet diameter d 3 When the anode compression angle is 90, the Mach number Ma reaches 2.38 at the outlet of the nozzle, which meets the requirements of supersonic plasma jet.

[0027] Moreover, the outlet pressures of the above three embodiments all reach the ambient pressure, the jet is in the best expansion state, and there is no shock wave.

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Abstract

The invention discloses a supersonic plasma spray gun. The supersonic plasma spray gun comprises an insulating gun body, an anode nozzle which is coaxially and fixedly connected with the insulating gun body, and a cathode which is arranged in the insulating gun body and the anode nozzle, wherein the front end of the cathode is a round table; a nozzle air current channel of the anode nozzle consists of a straight channel segment which is in size fitting with a gun body air current channel of the insulating gun body, and a Laval nozzle channel segment; the front end of the cathode is positioned in the straight channel segment of the anode nozzle; and the contraction segment of the Laval nozzle channel segment is matched with the round table shape of the front end of the cathode. Both the anode nozzle and the cathode adopt special structural designs, so that an ultrasonic plasma jet speed (Ma is greater than 2.2) can be obtained at the power of less than 30KW. The nozzle and electrodes of the spray gun have long service lives; the jet flow is stable; and the cost is low.

Description

technical field [0001] The invention belongs to the field of aerospace propulsion technology, in particular to a supersonic plasma spray gun. Background technique [0002] Plasma is the fourth state of matter, which contains a large number of electrons, ions and neutral particles. These particles are in a state of local thermal equilibrium. They have high energy density, high brightness, high electrical conductivity, high thermal conductivity and other characteristics. These The nature determines that plasma has a great application space in the field of aerospace. The plasma spray gun uses the high-temperature electric arc formed by the direct current discharge between the cathode and the anode to heat the propellant. After the propellant enters the confined channel, it is heated by the arc to 1.0×10 4 Ionization occurs after a very high temperature above K, and then flows through the expansion section of the nozzle that doubles as the anode, and after expansion, it is ejec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05H1/34
Inventor 杜镇志杨海朱亮李映坤刘锐陈雄郑健
Owner NANJING UNIV OF SCI & TECH
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