Adjustable coaxial double-slotting bolt type inspirator

Abstract

The invention relates to an adjustable coaxial double-slotting bolt type inspirator. A needle valve is also arranged between a shell and a center tube, the lower end of the center tube is provided with center tube slots, the lower end of the needle valve is provided with needle valve slots corresponding to the center tube, a passage is formed between a center rod and the inner wall of the center tube, and the center tube slots, the needle valve slots and the passage formed by the center rod and the inner wall of the center tube jointly form a center path nozzle. The invention provides the adjustable coaxial double-slotting bolt type inspirator which has the advantages that excellent mixing of a propellant is ensured, the solid boundary of jet flow is increased, and the combustion efficiency is improved.

Description

technical field [0001] The invention belongs to the field of liquid rocket engines, and relates to a coaxial pin injector, in particular to an adjustable coaxial double-slotted pin injector, which is used for variable thrust engines and fixed thrust engines, and is especially suitable for variable thrust engines and fixed thrust engines. thrust engine. Background technique [0002] For traditional fixed-area injectors, such as small-hole impingement type and coaxial centrifugal type, etc., when the propellant flow rate changes, the injection pressure drop of the injector will change sharply. Data show that engines using fixed-area injectors can achieve a thrust variable ratio of up to 2.5:1, so they cannot be applied to variable-thrust engines with large thrust changes. [0003] Existing adjustable slug injectors generally include an annular slot structure and a central element slotted structure. The atomization and mixing of the propellant in the annular gap structure is ...

AI Technical Summary

Problems solved by technology

The atomization and mixing of the propellant in the annular seam structure is poor, and the efficiency is low

The slotted structure of the central element enhances the atomization and mixing effect of the propellant, and the efficiency is improved, but because the central path moves up and down on the lower end surface of the needle valve to block the slot on the central element to adjust the injection area, the thrust of the engine becomes smaller , after the center slot nozzle is blocked, the jet spray pattern changes significantly, that is, the flow rate becomes smaller, and the state of the jet flow in the center path is slightly worse, resulting in poor propellant mixing and a decline in combustion efficiency

Images