Variable-thrust flexible nozzle system of miniature solid rocket engine

Abstract

The invention discloses a variable-thrust flexible nozzle system of a miniature solid rocket engine, and belongs to the technical field of aerospace power propulsion devices. The system comprises a displacement collecting module, a control module, a flexible spraying throat and a plurality of servo mechanisms arranged in the circumferential direction of the flexible spraying throat; the two ends of the flexible spraying throat are fixedly connected with a nozzle contraction section and a nozzle expansion section respectively; each servo mechanism comprises a servo motor, a transmission rod and a transmission piece, the servo motor is connected with the transmission rod, the transmission rod is connected with the transmission piece, and the transmission piece is attached to the outer wall of the flexible spraying throat; the displacement collecting module is used for collecting displacement data of the diameter change of the flexible spraying throat, the displacement collecting module and the servo motors are connected with the control module, and the control module is connected to an upper computer. The system is simple and reliable in structure and suitable for the miniature solid rocket engine, and the response speed for thrust change is greatly increased. Meanwhile, input and output signals are fed back in real time through the displacement collecting module and the control module, and the thrust control precision is improved.

Description

technical field [0001] The invention belongs to the technical field of aerospace power propulsion devices, and in particular relates to a flexible nozzle system of a miniature solid rocket motor with variable thrust. Background technique [0002] Miniaturization and miniaturization are an important direction in the development of modern spacecraft and weaponry. Whether it is in the aerospace field or equipped with weapons, the system is required to have the characteristics of fast response, high precision and high reliability, and the above characteristics are directly related to the miniature solid rocket motor system, which puts forward higher requirements for the solid rocket motor system. [0003] Due to the characteristics of high reliability, long storage time, and short preparation time, miniature solid rocket motors are often used in weaponry propulsion systems and spacecraft attitude adjustment systems. However, its combustion controllability is poor, and the thrus...

AI Technical Summary

Problems solved by technology

However, its combustion controllability is poor. The thrust of conventional solid rocket motors is closely related to its grain, and the thrust cannot be adjusted and changed in real time during the combustion propulsion process.

Weapons and equipment often require thrust changes such as low-speed cruise and accelerated defense penetration during flight. The spacecraft needs to precisely control the thrust of the engine to achieve precise attitude adjustment. Conventional miniature solid rocket motors cannot meet this demand.

[0004] At present, the thrust control of solid rocket motors is mainly divided into engine grain design and throat plug type variable thrust design; engine grain design mainly achieves thrust changes in different combustion stages by pouring different combustion sections or propellants at different stages, but it cannot be realized. More real-time flight conditions for thrust changes; the throat plug variable thrust design has a long response time, severe ablation and complex devices, which are not suitable for miniature solid rocket motors

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