Plug nozzle engine with secondary flow injection structure

Abstract

The invention discloses a plug nozzle engine with a secondary flow injection structure, and belongs to the field of airspace engines. The invention provides a secondary jet injection mode for a plug type spray pipe. The plug type spray pipe is mainly composed of a plug cone, an annular cover, a combustion chamber front end, a combustion chamber rear end, a communicating vessel and a secondary flow gas guide rod. The plug cone adopts a lateral fixing mode of rib column fixing, the overall mass of the plug cone can be reduced, the plug cone does not occupy the combustion chamber volume, and therefore the combustion chamber explosive loading amount is increased; the hole is formed in the wall face of the plug cone, secondary flow is guided into the plug cone through the secondary flow air guide rod, and the secondary flow is sprayed out of the hole in the wall face of the plug cone to provide lateral force for the engine, so that the rocket engine has the vector control capacity, mutual interference of main flow and secondary jet flow in a combustion chamber can be avoided, and the overall mass of the engine is reduced; the working efficiency of the rocket engine is improved. The invention has the advantages of easiness in processing, manufacturing and matching, compact integral structure, shorter spray pipe size, lighter weight, capability of carrying more charges and capability of improving the range of an engine.

Description

technical field [0001] The invention relates to a plug nozzle engine with a secondary flow injection mode, belonging to the field of aerospace engines. Background technique [0002] With the development of solid rocket motors, it is difficult to improve the performance of traditional bell-shaped nozzles, and they are over-expanded at low altitudes and under-expanded at high altitudes. There is a large performance loss at most of the height of the nozzle. The plug nozzle automatically adjusts and expands with the change of the external atmospheric pressure, so that the gas is in a fully expanded state at different heights. Such height compensation characteristics make the performance of the plug nozzle far better than that of the clock outside the design point. shaped nozzle. [0003] The use of the plug nozzle on the aerospace engine needs to meet the vector control requirements of the aircraft and provide the aircraft with a certain pitch and yaw channel control capabilit...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the bell-shaped nozzles on solid rocket motors adopt mechanical vector control schemes, but the structure and shape of the plug-type nozzles have great changes compared with the bell-shaped nozzles, which leads to the mechanical vector control method in the traditional sense. Not very suitable for use on plug nozzles

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