Pintle injector achieving head cooling through jet flow self-impact type membrane

Abstract

The invention provides a pintle injector achieving head cooling through a jet flow self-impact type membrane, and the problems that according to an existing pintle injector cooling mode, machining is complex, the cooling cost is high, and the cooling mode only can be used for one time are solved. The pintle injector comprises a combustion chamber, a needle valve and a central cylinder. The needle valve is arranged in a center channel of the combustion chamber and comprises a needle valve upper end cover and a needle valve lower barrel, wherein the needle valve upper end cover is arranged on the top of a combustion upper end cover, the needle valve lower barrel comprises a first barrel and a second barrel, and an annular propellant flow channel is arranged between the outer wall surface of the second barrel and the inner wall surface of the center channel of the combustion chamber and communicates with a liquid inlet of the combustion chamber. The central cylinder is arranged in an inner cavity of the needle valve, an open inner cavity liquid inlet is formed in the upper end of the central cylinder, and an inner end cover is arranged at the lower end of the central cylinder. A plurality of impact holes which communicate with an inner cavity of the central cylinder and have the same length-diameter ratio are formed in the inner end cover. A plurality of injection openings are formed in the lower end of the central cylinder in the circumferential direction of the central cylinder.

Description

technical field [0001] The invention belongs to the technical field of liquid rocket engine propellants, and in particular relates to a pintle injector which realizes head cooling through a jet self-impact membrane. Background technique [0002] The pintle injector is an important part of the liquid rocket engine. Compared with the traditional two-component impact or coaxial nozzle, the pintle injector can produce high combustion efficiency. And has the following working characteristics: strong adjustment ability, surface shutdown characteristics, low cost, high reliability, etc. [0003] Existing pintle injectors are cooled by active cooling methods (such as sweating cooling) or passive coating of anti-ablation coatings. However, sweating cooling methods have the disadvantages of complex processing and high cooling costs; The cooling method of the ablation coating cannot sufficiently cool the pintle injector, and the anti-ablation coating needs to be replaced after ablatio...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of complex processing, high cooling cost and single use of the existing pintle injector cooling method, and to provide a pintle injector that realizes head cooling through a jet self-impact film device

Images