Three-burning-rate variable-thickness combined propellant grain structure of nozzleless rocket motor

Abstract

The invention provides a three-burning-rate variable-thickness combined propellant grain structure of a nozzleless rocket motor. The three-burning-rate variable-thickness combined propellant grain structure comprises a main propellant grain and a nozzle propellant grain, wherein the main propellant grain comprises a high-burning-rate propellant grain and a medium-burning-rate propellant grain; theouter surface of the high-burning-rate propellant grain fits to the inner wall of an engine combustion chamber; the outer diameter of the medium-burning-rate propellant grain fits to the inner hole of the high-burning-rate propellant grain; the outer surface of the nozzle propellant grain fits to the inner wall of the engine combustion chamber; the tail part of the main propellant grain tightly fits to the head part of the nozzle propellant grain, and the fitted surface is in the shape of a funnel which is axially inward; and the diameter of the inner hole of the main propellant grain and thediameter of the inner hole of the nozzle propellant grain are the same at the fitted part, and the main propellant grain and the nozzle propellant grain define an engine fuel gas channel.

Description

technical field [0001] The invention relates to an engine charging technology, in particular to a nozzleless engine three-combustion-rate-variable-thickness combined charge structure. Background technique [0002] The nozzleless engine is a solid rocket motor with a unique design. It omits the mechanical nozzle at the tail of the conventional propeller combustion chamber, and instead uses the gas choking effect generated in the rear section of the grain channel to achieve a similar effect to the nozzle. Flow field acceleration effect. The nozzleless engine has the advantages of simple structure, high reliability, and relatively low cost. At the same time, its tail gas outlet can be changed as the combustion process progresses. Based on the above characteristics, the nozzleless engine is often used as the initial booster of the solid rocket ramjet. [0003] In order to ensure the conditions for the gas choking effect, the long-diameter ratio of the nozzleless engine is rela...

AI Technical Summary

Problems solved by technology

In essence, the specific impulse loss of the nozzle-less engine comes from the clogging phenomenon of high-temperature and high-pressure gas in the channel, accompanied by partial pressure loss, and its internal energy is not fully converted into gas kinetic energy

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