Pintle Type Varying Throat Diameter Nozzle Device for Solid-liquid Hybrid Rocket Engine

Abstract

The invention discloses a solid-liquid hybrid rocket engine pintle type variable-throat-diameter spray pipe device which comprises a shell, a spray pipe, a spray pipe shell, an end cover, a pintle and a spring. The shell is separated by a pintle matched section into a fuel gas cavity and a high pressure air cavity, and the shell is provided with a fuel gas channel communicated with the fuel gas cavity and an air inlet communicated with the high pressure air cavity; the spray pipe is connected with one end of the fuel gas cavity of the shell through the spray pipe shell, and the spray pipe shell is used for being connected with a body part of a burning chamber; a pipe opening of the spray pipe comprises a contraction section, a throat part and an expansion section which are sequentially connected; the end cover is installed at one end of the high pressure air cavity of the shell; and the pintle comprises a hemisphere head, a taper section, a thin section, a thick section and a spring positioning boss which are sequentially connected, the thin section is installed on the pintle matched section in a sliding manner, the taper section penetrates the fuel gas cavity to be suspended in the pipe opening of the spray pipe, the thick section is arranged in the high pressure air cavity in a sliding manner, a limiting step is formed between the thick section and the high pressure air cavity, and the spring is arranged on the spring positioning boss in a sleeving manner and abuts against the end cover. Control over the pressure of the burning chamber and change rate of the pressure of the burning chamber is achieved.

Description

Technical field [0001] The invention relates to the field of rocket engines, in particular to a needle-bolt type variable throat nozzle device for a solid-liquid mixed rocket engine. Background technique [0002] The nozzle throat of a rocket engine is usually round, and it is combined with the contraction section and the expansion section to accelerate the gas and generate thrust. [0003] The pressure of the combustion chamber is determined by the nature of the gas, the gas flow rate, and the area of ​​the throat; the venturi has a structure similar to that of the nozzle, consisting of a contraction section, a throat, and an expansion section. The upstream pressure and the throat area often determine the flow rate together. Needle-bolt adjustable venturi, using a cone-shaped real bolt, the throat area is changed by the motor to move the needle bolt position, thereby changing the flow rate; [0004] The above scheme has the following shortcomings: pin-bolt venturi is often used in ...

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Problems solved by technology

[0005] The object of the present invention is to provide a pintle type variable throat diameter nozzle device for solid-liquid mixed rocket motors, to solve the problem that the pintle type venturi tube is often used in the propellant supply system in the prior art, and the motor drive power volume ratio is small , not suitable for integration in the nozzle, can not be applied to the theoretical research of ignition, flameout and other processes, under the condition of certain propellant and flow rate, the technical problem of adjustment and control of combustion chamber pressure cannot be realized

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