Self-air-entrainment-based plasma jet igniter of aero-engine

Abstract

The invention discloses a self-air-entrainment-based plasma jet igniter of an aero-engine. The plasma jet igniter comprises an outer pipe, an insulating inner pipe, a conducting copper pipe, a cathodeand an anode; the lower end of the outer pipe is fixedly connected with the upper end of the anode; the outer pipe is internally sleeved with the insulating inner pipe; the insulting inner pipe is internally sleeved with the conducting copper pipe; the upper part of the cathode has threaded connection with a groove formed in the lower part of the conducting copper pipe; a hollow structure insidethe upper part of the cathode is an ionization region; the hollow structure inside the lower part of the anode is a flow jet region; the outer sidewall of the ionization region is provided with an igniter air inlet for leading air which is inside a main combustion chamber or mixed rotational air flow which is inside an afterburner into the ionization region; the upper part of the cathode is positioned inside the conducting copper pipe; and the lower part of the cathode is positioned inside the ionization region. The plasma jet igniter disclosed by the invention needs not to be externally connected with an air entraining device; the air flow in two channels of the main combustion chamber or the air flow in the afterburner is directly led into the plasma jet igniter, so the structure of an igniting device is simplified, and the weight and volume of the igniting device are reduced.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, in particular to an aero-engine plasma jet igniter based on self-bleed air. Background technique [0002] At present, there are ignition devices in the main combustion chamber and the afterburner of the aero turbine engine. The ignition method used in the main combustion chamber is electric nozzle ignition; Thermal jet ignition and catalytic ignition, various ignition methods have certain limitations. The ignition devices of the main combustion chamber and the afterburner respectively have the following main problems: [0003] The problems of the ignition device in the main combustion chamber are as follows: (1) The electric nozzle ignition is directly ignited by the electric spark generated by the high-energy electric nozzle, the energy is small, and the ignition core area is small; especially in high altitude conditions, the ignition envelope is small , the ignition success rate is low, ...

AI Technical Summary

Problems solved by technology

However, in the above two Chinese invention patents, the plasma jet igniter needs an external air-entraining device, which has a relatively complicated structure, large volume and heavy weight

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