Gas-oxygen/gas-methane torch igniter

Abstract

The invention discloses a gas-oxygen / gas-methane torch igniter. The gas-oxygen / gas-methane torch igniter comprises a sparking plug seat, a gas-methane gas collecting cavity outer shell and the like. According to the gas-oxygen / gas-methane torch igniter, ignition chamber propellant is filled and high-temperature oxygen-enriched fuel gas is formed through primary combustion by virtue of group gas oxygen-gas methane mutual-firing type injection, and a gas film formed by the gas-film cooling gas oxygen injection holes in the shell of the ignition chamber body is used for carrying out gas film cooling on the wall surface of the ignition chamber flowing through the high-temperature oxygen-enriched fuel gas; and the high-temperature oxygen-enriched fuel gas and the discharged cooling methane aresubjected to afterburning in the secondary afterburning combustion chamber and are discharged through a secondary throat part so as to form a jet torch. The invention provides the gas oxygen / gas-methane torch igniter for a liquid rocket engine, which can work under the condition that the structural size is limited and cannot be ablated for a long time, the gas oxygen / gas-methane torch igniter canbe used as an ignition single element for starting a liquid oxygen / a methane rocket engine generator or a thrust chamber.

Description

technical field [0001] The invention relates to a torch igniter. Background technique [0002] The gas / gas flare igniter is one of the main ways to start the ignition unit used in the liquid rocket engine generator or thrust chamber, and is widely used in liquid hydrogen / liquid oxygen rocket engines and liquid oxygen / methane rocket engines. [0003] There are mainly two ways of combustion organization of existing gas / gas torch igniters: one way is to use high-temperature oxygen-enriched gas and cooling exhaust fuel to carry out mixed combustion in the generator, and then the high-temperature gas is injected into the engine combustion chamber through the gas conduit; The anti-ablation protection measures of the gas conduit mostly use high-temperature alloys, and rely on the heat sink of the gas conduit to meet the working time requirements of the igniter, so the continuous working time is relatively short, generally 1 to 3s. Another way is to use high-temperature oxygen-enri...

AI Technical Summary

Problems solved by technology

Since the ratio of the pressure in the ignition chamber to the ambient pressure at the outlet of the gas conduit is usually greater than 10, and the flow velocity of the high-temperature oxygen-enriched gas at the outlet of the ignition chamber is at the local sound velocity, the difficulty of secondary supplementary combustion is high, and secondary supplementary combustion failure is prone to occur, resulting in failure to form a gas that meets the temperature requirements. jet torch

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