Multiunit coaxial injector component for test and manufacturing method

Abstract

The invention discloses a multiunit coaxial injector component for a test, which comprises an upper plate, an oxidant nozzle and an outer framework. A single injection unit only comprises the oxidant nozzle without a fuel nozzle component, wherein an annular fuel nozzle is formed between the lower end of the oxidant nozzle and an injector hole on the lower plate of the outer framework; the oxidant nozzle is in sealed connection with the upper plate through braze welding; the upper plate is in sealed connection with the outer framework through sub-arc welding; the periphery of the outer framework is designed in a porous form; a tool is adopted when injection holes are machined on the upper plate and the outer framework jointly; and the tool is also needed when the oxidant nozzle is brazed with the upper plate. In the multiunit coaxial injector component for the test, a design method for the multiunit injector used for the test is directly provided; a nozzle structure which generally needs external fuel is saved; the multiunit coaxial injector component has a simple structure and low cost, can avoid the leakage between an oxidant chamber and a fuel chamber, and can strictly ensure the coaxiality of coaxial injector units; and the fuel chamber can be designed lower.

Description

【Technical field】 [0001] The invention relates to a test component with a plurality of coaxial injector units and a method for its production. The invention finds particular application in the design of multi-unit injector components for liquid rocket motor testing. 【Background technique】 [0002] As one of the key components of the liquid rocket engine, the injector often has to carry out a large number of tests and tests of the multi-unit injector during its development process, which involves the design of the multi-unit injector. [0003] Generally, in the design of multi-unit injector components, due to the design of the oxidizer nozzle parts being too long and the number of parts of the overall injector component too large, the unit nozzles are all combined in the form of the oxidant inner nozzle part and the fuel outer nozzle part. This is to ensure the coaxiality between the hydrogen and oxygen injection holes; and the fuel inlet adopts the nozzle to directly introd...

AI Technical Summary

Problems solved by technology

[0003] Generally, in the design of multi-unit injector components, due to the design of the oxidizer nozzle parts being too long and the number of parts of the overall injector component too large, the unit nozzles are all combined in the form of the oxidant inner nozzle part and the fuel outer nozzle part. This is to ensure the coaxiality between the hydrogen and oxygen injection holes; and the fuel inlet adopts the nozzle to directly introduce the fuel into the fuel chamber, and in order to ensure that the flow rate of the fuel in the fuel chamber cannot be too high, the nozzles of each unit are evenly distributed, so that the hydrogen chamber The height design is high, which makes the oxidant nozzle design longer, difficult to process, and high in cost; as documented by Immich, H.Alting J., Kretschmer J., et al. "Technologies for thrust chambers of future launch vehicle liquid rocket engines" AIAA Paper No: 2002-4134 shows the multi-unit injector components, in which the unit nozzles are all in the form of a combination of oxidant inner nozzle parts and fuel outer nozzle parts, the oxygen nozzle design is very long, and the injector component design is complicated

And Mauritz.A.deRidder, DavidA.Helderman, Nicholas J.Nugent, et al. "Measurement and Analysis of HeatTransfer in a Multi-Element Hydrogen / Oxygen Rocket Combustor", AIAA Paper No: 2008-5031 fuel inlet adopts nozzle The fuel is directly introduced into the fuel chamber, so that the height of the hydrogen chamber is designed higher, the design of the oxidant nozzle is longer, the processing is difficult, the coaxiality is not easy to guarantee, and the scrap rate is high

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