Power plants – Reaction motor – Liquid oxidizer
Reexamination Certificate
1999-10-01
2001-04-10
Kim, Ted (Department: 3746)
Power plants
Reaction motor
Liquid oxidizer
C239S424500, C239S427500
Reexamination Certificate
active
06212878
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to the field of power machine building and is concerned with the realization of mixing devices of gas generators for driving gas turbines, in particular for liquid-propellant rocket engines.
BACKGROUND OF THE INVENTION
A mixing device for a combustion chamber of a liquid-propellant rocket engine is known in which a mixer is made in the form of a centrifugal injector mounted inside a combustion chamber housing and coupled to propellant and oxidizer feed ducts (Russian patent No. 2041375, F02K 9/52, 1990).
The known mixing device cannot be used in high-thrust engines in view of the fact that making the mixer in the form of a centrifugal injector sharply increases the radial dimensions of the mixer, and thus worsens the weight-size characteristics of the engine as a whole.
A mixing device of a gas generator is known in which a mixer housing is mounted inside an oxidizer space formed by the bottom and another stationary part of the housing, an axial propellant feed duct being made in the mixer housing and an oxidizer feed duct being made annular and separated from the propellant feed duct by a cylindrical baffle (U.S. Pat. No. 4,974,415, NPC 60-733, 1988).
The main disadvantage of this known mixing device is the complexity of providing a table combustion process at low temperatures of the generator gas supplied to the turbine of a liquid-propellant rocket engine.
The most similar technical solution is a mixing module for liquid-propellant rocket engines, which comprises a cover and a bottom and is installed with the formation of a space between them for feeding one of the components to be mixed, and a module housing mounted in the space between the cover and the bottom and provided with an axial duct communicating with a duct for feeding another component and open towards a mixing chamber, the space between the cover and the bottom being coupled to the mixing chamber by means of longitudinal grooves uniformly located along the circumference of the cross section of the module housing (German patent No. 4305154, IPC F02K 9/52, 1993).
In this known mixing module, a propellant is fed into the mixing chamber from the space between the cover and the bottom, and the axial duct of the module housing is coupled to the oxidizer feed duct, wherewith it is not possible to provide an additional supply of oxidizer to the combustion products in order to reduce the temperature of the generator gas.
SUMMARY OF THE INVENTION
The object of the invention is to increase the operating efficiency of a mixing module.
The technical result that may be obtained by using the present invention consists of improving the quality of mixing while producing gas with a high content of oxygen and with a reduced temperature.
This result is achieved in a gas generator module comprising a cover, a bottom and a housing installed therebetween, a mixing chamber made in the bottom in the place of installation of the housing, main propellant and oxidizer feed lines, the housing having an axial duct, and longitudinal grooves uniformly arranged along the circumference of the housing from the side of the bottom to communicate the mixing chamber with the space between the cover and the bottom, in that in accordance with the invention the axial duct of the housing from the side of the cover is made closed and has tangential holes for feeding propellant which are uniformly positioned on a surface of the housing and communicate with the main propellant feed line, the space between the bottom and the cover communicates with the main oxidizer feed line, wherein an additional annular duct, positioned coaxially to the axial duct and having tangential holes for feeding the oxidizer, which open into the space between the bottom and the cover, and an additional mixing chamber formed by extension of an external wall of the annular duct and communicating at one side with the annular duct and the axial duct and at another side with the mixing chamber made in the bottom, are made in the housing.
Wherein, a tapered bore, the longitudinal axis of which coincides with the longitudinal axis of the bottom mixing chamber, is preferably made in the bottom at the side opposite to the module housing. Wherewith the additional cylindrical mixing chamber of the module housing is preferably made with a length equal to at least twice its diameter.
Also, the tangential holes of the annular duct are preferably made in the form of two rows of holes, uniformly positioned along the circumference of the housing.
REFERENCES:
patent: 3851468 (1974-12-01), Frankie et al.
patent: 4845940 (1989-07-01), Beer
patent: 4974415 (1990-12-01), Shekleton et al.
patent: 5112219 (1992-05-01), Hiemstra
patent: 5172548 (1992-12-01), Dubedout et al.
patent: 5456065 (1995-10-01), Dargies
patent: 5704551 (1998-01-01), Schmidt et al.
patent: 5882184 (1999-03-01), Feldermann
patent: 5927960 (1999-07-01), Felderman
patent: 4305154 (1994-05-01), None
patent: 2041375 (1995-08-01), None
Adzhian Alexei Pogosovich
Bogushev Vladimir Jurievich
Samsonov Alexandr Mikhailovich
Tjurin Jury Anatolievich
Blakely & Sokoloff, Taylor & Zafman
Kim Ted
Otkrytoe Aktsionernoe Obschestvo "Nauchno-Proizvodstvennoe Obied
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