Liquid rocket engine pintle injector with stable flow structure

Abstract

The invention discloses a liquid rocket engine pintle type inspirator with a stable flow structure. The liquid rocket engine pintle type inspirator comprises an inspirator shell connected with a combustion chamber body, a needle valve for isolating two propellants before entering a combustion chamber, a supporting plate for fixing a pintle and the pintle, wherein the pintle and the needle valve jointly form an inner ring propellant runner; the rear section of the flow channel between the injector shell and the needle valve forms an outer nozzle, the rear section of the flow channel between the needle valve and the pintle forms an inner nozzle, according to needs, the outer nozzle or the inner nozzle or the two nozzles simultaneously have a structure that the flow area is firstly reduced and then increased, the position with the minimum flow area is a nozzle throat part, and if the propellant is in a liquid state, cavitation occurs at the nozzle throat part, and the propellant can be injected into the injector shell. If the propellant is in a vapor state, the sound speed is kept at the throat part of the nozzle, so that the pressure fluctuation in the combustion chamber cannot be transmitted to the upstream of the nozzle, and the flow of the propellant in the path cannot be influenced, namely, the nozzle has the function of stabilizing the flow; therefore, an engine system can be simplified, the flow resistance of an engine flow path is reduced, and the engine performance, especially an extrusion type liquid rocket engine, is improved.

Description

technical field [0001] The invention belongs to the field of aerospace, in particular to a liquid rocket engine. Background technique [0002] Needle-bolt injector liquid rocket engine has the advantages of simple structure, convenient adjustment, high reliability, stable combustion and low cost, and has received more and more attention. However, the existing needle-bolt injectors all have a common feature. The nozzle on the injector does not have a structure for stable flow, and the pressure fluctuation of the combustion chamber can be transmitted to the upstream of the nozzle through the nozzle, so that the upstream pressure also fluctuates. The fluctuation of the flow rate further amplifies the fluctuation of the pressure in the combustion chamber, resulting in aggravated engine vibration and great changes in performance. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to obtain a pin-bolt injector with a stable flow structure to promote the f...

AI Technical Summary

Problems solved by technology

However, the existing pintle injectors all have a common feature. The nozzle on the injector does not have a structure to stabilize the flow rate. The pressure fluctuation of the combustion chamber can be transmitted to the upstream of the nozzle through the nozzle, so that the upstream pressure also fluctuates. The fluctuation of the flow rate further amplifies the pressure fluctuation of the combustion chamber, which leads to the aggravation of engine vibration and great changes in performance

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