An adjustable low-pressure ignition experimental system for studying sub-supermixed flow

Abstract

The invention discloses an adjustable low-pressure ignition experiment system for studying sub-supermixed flow, which includes an experiment section, which has a gas inlet and a gas outlet, and a mixed gas flow channel connected between the gas inlet and the gas outlet; subsonic velocity The gas flow channel, whose gas outlet end is connected to the first inlet of the gas inlet; the air inlet joint, connected to the inlet end of the subsonic gas flow channel; the supersonic gas flow channel, whose gas outlet end is connected to the second inlet of the gas inlet; The chamber is connected to the inlet end of the supersonic gas flow channel; the outlet flow channel is connected to the gas outlet and has a heat exchange section on it; and the back pressure adjustment mechanism is connected to the gas outlet of the outlet flow channel for The back pressure of the experimental system is adjusted by vacuuming; the present invention connects the back pressure adjustment mechanism on the outlet channel, which can adjust the back pressure of the experimental system according to the experimental needs, better simulate the working environment of the rocket engine, and make the adjustment of the back pressure of the experimental system more accurate. accurate.

Description

technical field [0001] The invention belongs to the technical field of aerospace experimental instruments, and in particular relates to an adjustable low-pressure ignition experimental system for studying sub-supermixed flow. Background technique [0002] In the embedded rocket ramjet combustion chamber, the mixture of the main rocket gas and the incoming air is a typical large-gradient sub-supershear mixed flow, and the large velocity difference and large temperature difference between the two jets make the difference between the jets The thickness of the formed shear mixing layer grows abnormally slowly with the flow direction, which will affect the energy and momentum transfer between the two jets, and then cause the overall combustion efficiency of the main ram combustion chamber to be low, and the fuel energy cannot be fully utilized, which will seriously affect the ram combination The working characteristics of the engine have become one of the technical bottlenecks in...

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Problems solved by technology

[0005] However, the current experimental devices for measuring sub-supershear mixed flow are only under constant back pressure conditions, while the high-altitude engine actually works under low back pressure conditions, which makes the existing experimental devices very useful for obtaining The flow field structure and characteristics of sub-supershear mixed flow have little reference significance

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