EP0396554A1

EP0396554A1 - Burner.

Info

Publication number: EP0396554A1
Application number: EP88909088A
Authority: EP
Inventors: Michael L Zettner
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-11-03
Filing date: 1988-10-25
Publication date: 1990-11-14
Anticipated expiration: 2008-10-25
Also published as: IL88214A; JPH0442564B2; DE3737247C1; US5131840A; CN1016265B; CN1033685A; AU612725B2; RU1830126C; ZA888069B; EP0396554B1; WO1989004439A1; IL88214A0; BR8807777A; DE3884218D1; AU2555988A; JPH02502750A

Abstract

Un brûleur pour mélanges combustibles composés de deux constituants fluides comprend une enceinte (1), un premier organe d'amenée du premier constituant, un deuxième organe d'amenée du deuxième constituant et un orifice de sortie (15) des gaz de combustion. Un injecteur tubulaire (2) sert d'organe d'amenée du premier constituant et comprend à son extrémité tournée du côté de l'orifice de sortie (15) un alésage axial postérieur (21), à l'autre extrémité un alésage axial antérieur (22) plus étroit, un passage resserré (23) entre les deux alésages (21, 22) et au moins un canal radial incliné (241, 242; 243, 244) dont le sommet de l'angle alpha est orienté vers l'alésage axial postérieur (21), obliquement à l'axe (i) de l'injecteur, et qui s'étend de l'espace intérieur de l'enceinte (1) jusqu'au passage resserré (23) ou qui s'étend sur les côtés de l'alésage axial antérieur (22) et se termine avant le passage resserré (23), de sorte qu'une partie du deuxième constituant qui afflue dans l'enceinte (1) à travers le canal incliné atteigne le passage resserré, s'y mélange au premier constituant qui pénètre par l'alésage axial antérieur (22), entre en combustion dans l'alésage axial postérieur (21) d'où ils s'en écoule dans l'enceinte (1).A burner for fuel mixtures composed of two fluid constituents comprises an enclosure (1), a first supply member for the first component, a second supply member for the second component and an outlet (15) for the combustion gases. A tubular injector (2) serves as a feed member for the first component and comprises at its end facing the side of the outlet orifice (15) a posterior axial bore (21), at the other end an anterior axial bore (22) narrower, a constricted passage (23) between the two bores (21, 22) and at least one inclined radial channel (241, 242; 243, 244) whose apex of the angle alpha is oriented towards the posterior axial bore (21), obliquely to the axis (i) of the injector, and which extends from the interior space of the enclosure (1) to the narrow passage (23) or which extends on the sides of the front axial bore (22) and ends before the constricted passage (23), so that part of the second component which flows into the enclosure (1) through the inclined channel reaches the constricted passage , mixes therein with the first component which enters through the anterior axial bore (22), enters combustion in the posterior axial bore (21) from where they flow into the enclosure (1).

Description

Description of the furnace

The invention relates to a combustion device for the combustion of a combustible mixture consisting of two flowable components.

In combustion processes like those in modern ones

Internal combustion engines take place, a distinction is made between closed and open systems. A closed system is a closed combustion chamber in which the fuel and oxidizer are brought together, burn and then perform mechanical work or generate heat through the expansion of the combustion gases.

In an open system, the fuel and oxidizer are burned in a combustion chamber and the combustion gases emerge as a jet from an opening in the combustion chamber. The gas jet can be used, for example, as a drive means in aircraft and spacecraft or turbines, but it can also be used for other purposes, such as heating purposes. In the open systems, a high flow rate at which the fuel and oxidizer flow into the combustion chamber has an unfavorable effect on the ignition behavior. The range of the mixing ratio of fuel and oxidizer in which it is ignitable (ignitability range) becomes smaller as the flow velocity or combustion chamber pressure increases.

If that is necessary for ignitability

Mixing ratio between fuel and oxidizer is not can be adhered to, so-called blowouts occur. The flame front breaks off and the media flow unburned through the combustion chamber. In the case of fuels that are inherently extremely inhomogeneous, it is not possible to maintain this ignitability range without complex auxiliary constructions and aids. In the case of fuels that burn extremely quickly or even detonate, such as hydrogen, for example, the range of ignitability becomes extremely small at higher flow speeds and, depending on them, higher combustion chamber pressures. The thermal influences can already lead to the ignitability range shifting in such a way that blowouts occur.

In the case of thermally favorable combustion of lean mixtures, there is also a very small range of ignitability at higher flow velocities of the media to be burned and, depending on these, high combustion chamber pressures. Here, too, the risk of blowouts is very high. In order to achieve high thermal efficiencies, a correspondingly complex construction with a pre-combustion chamber and valves must be used in open systems.

Another solution for eliminating the ignition problems would be to make the mixture too rich to far beyond the stoichiometric equilibrium. However, this would lead to poorer thermal efficiencies. A catalytic remedy would be very expensive and possibly also harmful to the environment.

US Pat. No. 3,733,165 discloses an incinerator for burning liquid fuels described, whereby oxygen and air are used as oxidizers. The aim of the combustion device is to combine the use of oxygen for the purpose of as complete combustion as possible with a small flame volume in order to avoid the

On the other hand, using pure oxygen cannot reduce the high temperatures that can be achieved by using a large flame volume. For this purpose, pure oxygen is supplied through a central pipe with a nozzle and the fuel is supplied in a larger surrounding pipe. Shortly before the nozzle, a small portion of the fuel enters an oxygen pre-combustion chamber through inclined channels, swirls with the oxygen there and then burns in the pre-combustion chamber with a small, very hot flame, which completely evaporates the main amount of fuel around it. The combustion air is fed into a third pipe concentrically surrounding the fuel pipe, which then burns with the vaporized, partially atomized and very reactive fuel. The main combustion in the above-described combustion device with the combustion air takes place in a plane given by the nozzle orifices, in this plane the two reactants, evaporated fuel and air, emerge from the nozzle at the same time Air, a stoichiometrically sufficient amount is available. In this combustion device, no problems are dealt with which result from substoichiometric combustion, ie from the combustion of a lean mixture, in particular at high flow velocities. The invention is therefore based on the object of creating a combustion device for the combustion of a flowable fuel with a flowable oxidizer, by means of which the ignition problems that occur in particular with lean mixtures are avoided.

To solve this problem, the invention is based on a combustion device for burning a combustible mixture of two flowable components, of which at least one is at high pressure or higher

Velocity is supplied, with a housing with a chamber, means for the supply of the first and the second component and for their mixing and an outlet opening for the combustion gases. The invention consists of an injector tube as

Feed means for the first component, which protrudes into the chamber housing in the direction of its outlet opening and at its end oriented towards the outlet opening a rear axial bore, at its end facing away from the outlet opening a narrower front axial bore, between the two bores a constriction and at least one radial and inclined to the injector axis from the interior of the chamber housing into the constriction or near it in the front axial bore, with its inner end pointing in the direction of the rear axial bore, through which part of the second component flowing into the chamber housing to the constriction or into the front Axial bore flows, mixes there with the first component, after which this mixture burns at least partially in the rear axial bore and flows out of this into the chamber housing.

The injector tube preferably consists of one Base part with the rear axial bore and a coaxial injector needle with the front axial bore, movable in the base part in the longitudinal direction, the total cross-section of the inclined channels being able to be changed by moving the injector needle in the axial direction.

In the case of a very high-energy combustion in the injector pipe, it may be necessary in a further development of the invention to provide the injector pipe with cooling fins on its outside. This results in a higher heat dissipation to the second component flowing along the outside of the injector tube, for example the oxidizer.

In the case of a chamber housing that is open at the front, as is the case, for example, in ramjet engines, in a further development of the invention the injector tube must be angled or curved in an arc.

In a special embodiment of the burner device, this consists of a cylindrical chamber housing with a head part, the head part having a central bore for receiving the injector tube, around which nozzles are arranged as feed devices for the second component.

In a special form of the invention, the injector tube consists of a catalytic material or is provided with a catalytic material. In the drawings, exemplary embodiments of the invention are shown in a perspective, partially cut-away representation. Show it:

Fig. 1 shows a burning device with a

Chamber housing and an injector tube,

FIG. 2 shows the combustion device according to FIG. 1 without the injector tube,

3 shows a non-adjustable injector tube,

4 shows an adjustable injector tube,

FIG. 4A an exploded view of the adjustable injector tube according to FIG. 4,

4B shows the adjustable injector tube according to FIG. 4 with open inclined channels

4C shows the adjustable injector tube according to

Figure 4 with almost closed inclined channels

5 shows an injector tube with cooling fins and

6 shows a combustion chamber housing with an angled injector tube.

FIG. 1 shows a perspective, partially cut-away representation of a combustion device with a chamber housing 1 and an injector tube 2. The chamber housing 1 is used to burn a flowable fuel with a flowable oxidizer at a high combustion chamber pressure or high inflow velocity. The term “flowable substance” is to be understood as meaning all liquids, gases or emulsions, but also mixtures of liquids or gases with solid particles which, however, have flowable properties. As an example embodiment, FIGS. 1 and 2 show a cylindrical chamber housing 1 with a disk-shaped head part 11, the head part 11 for receiving the injector tube 2 being provided with a central bore 12 (FIG. 2) around which several nozzles 13 are arranged as a supply means for the second component of a combustible mixture. In FIG. 2, for example, the nozzles 131-136 are visible. However, the number or position of the nozzles 13 is not essential to the invention. The combustion gases emerge from the chamber housing 1 through the outlet opening 15 as a jet.

The injector tube 2 shown in FIG. 3 serves as a supply means for the first component of the combustible mixture. It has to be on his

The rear end of the outlet opening 15 is oriented towards a rear axial bore 21, at its end facing away from the outlet opening 15 a narrower front axial bore 22 and between the two bores 21, 22 a constriction 23 of

Angle α in the direction of the front axial bore

21 pointing, from the chamber interior to the constriction 23 or on the side of the rear axial bore

22 shortly before the bottleneck 23. Through the inclined channels 241, 242, part of the second component flowing into the chamber housing 1 flows into the constriction 23 or just before the constriction 23, mixes there with the first component entering through the rear axial bore 22 and burns in the rear axial bore 21. that the inclined channels 241, 242 form an acute angle α with the injector axis i, exerts through the inclined channels 241,

242, the second component flowing to the constriction 23 exerts a suction effect on the first component entering through the front axial bore 22. The cross-sectional area of all the inclined channels 241, 242 together with the cross-sectional area of the front axial bore 22 is greater than the cross-sectional area of the constriction 23. The cross-sectional area of all inclined channels 241, 242 is therefore not added to the cross-sectional area of the constriction 23 even if the inclined channels 242, 242 are completely or partially open into the constriction 23.

The flammable mixture is ignited in the chamber housing 1 by an ignition probe 3

Chamber housing 1 promoted. After ignition, the flame strikes back as far as the constriction 23 between the two axial channels 21, 22, but not beyond the constriction. The two components of the combustible mixture only mix at the constriction 23, since there is no ignitable mixture in front of the constriction 23 in the front axial bore 22. With an open furnace is, for example, at a combustion pressure of 4 bar in the chamber housing 1,

Air as the second component at 5 to 6 bar is fed to the chamber housing 1 through the nozzles 13 and the fuel as the first component is only fed to the injector tube 2 at a pressure of 0.6 bar. A back pressure or a "stutter" of the combustion does not take place even with these large pressure differences.

For technical and economic reasons, the burning behavior of the burner device is of particular interest in the case of an excess of the second component, for example air, as a lean mixture. The use of the

The effect of the injector tube 2 here is that when there is a change in pressure and flow rate in the chamber housing 1, there is no change in the combustion behavior with regard to the ignitability of the mixture, but only when there is a change in the

Injector tube adjustment, as shown in Figures 4B and 4C. The combustion in the injector tube 2 can thus be influenced by enlarging or reducing the inclined ducts 241, 242. The above-described decoupling of the combustion behavior of the combustion device from the leanness of the mixture does not exist if the first component is fed to the chamber housing 1 only through a hollow needle protruding into the chamber housing 1, with or without a nozzle. This can lead to such lean mixtures that the ignitability is not reached. The rear axial bore contains a very rich mixture, since the larger part of the second component flows outside of the injector tube 2 and only the smaller part of the second component entering through the inclined channels 241, 242 into the injector tube 2 reacts with the first component in the injector tube 2 . The portion of the second component flowing along this outside of the injector tube 2 acts as a sheath flow and thus prevents the heat of the

Injector tube 2 is lost to the combustion system. This sheath flow reduces the heat transfer from the hot core flow that emerges from the injector tube 2 to the outer walls of the chamber housing 1, since only the much less

Temperature gradient between the jacket flow and the outer walls for which heat loss is decisive. This means that more energy remains in the combustion gases and the overall combustion is more efficient. During the combustion in the rear axial bore 21 of the injector tube 2, those parts of the second component which pass through the inclined channels 241, 242; 243, 244 get into the injector tube 2 with the first component entering through the front axial bore 22. During this combustion, however, unburned residues can get from the injector tube 2 into the chamber housing 1 for various reasons. At the edge zones of the core flow to the surrounding sheath flow, reactions then occur between the second component located in the sheath flow, which did not enter the injector tube 2 through the inclined channels 241 - 244, and the unburned residues of the first component, which passed through the injector tube 2 has entered the chamber housing 1. Unburned residues of the first component can occur in the following cases:

- If one or both components are inhomogeneous.

In this case, the combustion in the rear axial bore 21 changes to the extent that the composition of the one or both components changes. In the case of inhomogeneous fuels, the volume ratio is the

Components adjusted in such a way that even with the lowest possible energy content of the respective components, a mixture which is definitely in the easily ignitable range can burn in the rear axial bore 21.

On the other hand, this means that if the first component has the highest possible energy content, it cannot react completely with the second component, which enters the injector tube 2 through the inclined channels 241-244, in the rear axial bore 21 of the injector tube 2.

- In a second case, unburned residues of the first component can also arise from the fact that the pressures or the flow velocities, and as a result, the pressures in turn, change in such a way that the energy density of the first component changes as a further consequence.

In the event of fluctuations in the flow rate or the pressures with which the components are input, unburned residues can also occur during the reaction in the rear axial bore 21 of the injector tube 2. - Unburned residues can also occur if the reaction speed of the combustion in the rear axial bore 21 of the injector tube 2 is so small that the time in which the components flow through the rear axial bore 21 is not sufficient for a complete reaction. This would be conceivable, for example, in the case of slowly burning emulsions. The design of the injector tube 2, in particular the length of the rear

Axial bore 21 has a significant influence on the burnout in such cases.

When leaving the rear axial bore 21 of the injector tube 2, the unburned residues of the first component have such a high temperature that they immediately react with the second component in the sheath flow.

If one or both fuel components are very inhomogeneous, it is necessary to be able to optimally adjust the mixing ratio of the two components in the injector tube 25. For this purpose, the injector tube 25 shown in FIGS. 4, 4A consists of one

Base part 26 with the rear axial bore 21 and a coaxial injector needle 27 with the front axial bore 22, which is displaceable in the base part 26 in the longitudinal direction. The axial displacement of the injector needle 27 in the

Base part 26, the total cross-section of the inclined channels 243, 244 can be changed. This makes it possible to change the mixing ratio of the two components during the combustion in the rear axial bore 21 as desired. FIG. 4A shows an exploded view of the base part 26 and the injector needle 27. A defined movement of the injector needle 27 in the base part 26 can be carried out, for example, by means of a thread, not shown in the drawings, between the base part 26 and the injector needle 27.

In FIGS. 4B, 4C, the injector tube 25 is shown with two extreme positions of the injector needle 27: In FIG. 4B, the inclined channels 243, 244 are completely open and in FIG. 4C they are almost closed. When different components are burned in the same injector tube 25, when changing from one fuel to the other, only the injector needle 27 needs to be changed or readjusted in a predetermined manner.

In the drawings, only two inclined channels 241, 242 and 243, 244 are shown. It is understood, however, that the number of

Inclined channels is not limited to this number, but that there can be as many inclined channels as are required for the supply of a sufficient proportion of the second component or for a spatially uniform distribution. In Figure 5, an injector tube 2 is shown, which has cooling fins on its outside

28 has. The number and geometry of the cooling fins 28 must be determined on a case-by-case basis.

Finally, FIG. 6 shows a chamber housing 14 which is open at the front and in which the injector tube 2 is supported by an angled extension 29. The first component is also supplied through the extension 29. The approach

29 can also be curved like a circular arc section, so that an injector tube 25 with inclined channels 243, 244 with a variable cross section can be used.

To improve the combustion, the injector tube 2 can consist of a catalytic material or be provided with a catalytic material.

Reference number list

Chamber housing

Headboard central hole

Nozzle 131-136 nozzles open chamber housing at the front

Outlet opening

Injector tube rear axial bore front axial bore

Narrow point 241, 242 inclined channels with constant cross-section 243, 244 inclined channels with variable cross-section

Injector tube with variable cross-section of the

Inclined channels

Basic part

Injector needle

Cooling fins

Ignition probe

INTERNATIONAL APPLICATION PUBLISHED AFTER THE TREATY ON INTERNATIONAL COOPERATION IN THE FIELD OF PATENTS (PCT)

(51) International patent classification 4 (11) International publication number: WO 89/044 F23D 11/40, F23C 6/00 AI (43) International

Release date: May 18, 1989 (05/18/19)

(21) International file number: PCT / EP88 / 00953

Released

(22) International filing date: With international search report.

October 25, 1988 (10/25/88)

(31) Priority file number: P 37 37 247.5

(32) Priority date: November 3, 1987 (November 3, 1987)

(33) Priority country: DE

(71) (72) Applicant and inventor: ZETTNER, Michael, L. [AT / DE]; Neufriedenheim 9, D-8830 Treuchtlingen (DE).

(74) Lawyer: BROSE, Manfred; Pellergasse 45, D-8500 Nürnberg 50 (DE).

(81) Designated states: AT (European patent), AU, BE (European patent), BR, CH (European patent), DE (European patent), FR (European patent), GB (European patent), IT (European patent) , JP, LU (European patent), NL (European patent), SE (European patent), SU, US.

(54) Title: BURNER

(54) Designation: BURNING DEVICE

(57) Abstract

A burner for combustible mixtures consisting of two fluid components comprises a chamber housing (1), first feed means for the first component, second feed means for the second component and an outlet orifice (15) for the combustion gases. The feed means for the first component is an injector tube (2) which has at the end facing the outlet orifice (15) a rear axial bore (21), at the other end a narrower front axial bore (22), a narrow passage (23) between the two bores (21, 22) and at least one inclined radial channel (241, 242; 243, 244) inclined to the injector axis (i) at an angle α, the apex of which is turned towards the rear axial bore (21) and which ex- tends from the inner space of the chamber housing (1) to the narrow passage (23) or along the sides of the front axial bo

(22) and ends before the narrow passage (23) in such a way that a part of the second component which flows through the inclined channel into the chamber housing (1) reaches the narrow passage, where it mixes with the first component, whic enters through the front axial bore (22), is burnt in the rear axial bore (21) from which it flows into the chamber housin (1).

(57) Summary

A combustion device for burning a combustible mixture consisting of two flowable components consists of a chamber housing (1), first supply means for the first component, second supply means for the second component and an outlet opening (15) for the combustion gases. The supply means for the first component is an injector tube (2) which, at its end oriented towards the outlet opening (15), has a rear axial bore (21), at its other end a narrower front axial bore (22), between the two bores (21, 22) a bottleneck

(23) and at least one radially and obliquely to the injector axis (i) with the apex of the angle α in the direction of the rear axial bore (21), from the interior of the chamber housing (1) into the constriction (23) or on the side of the front axial bore ( 22) shortly before the constriction (23) running inclined channel (241, 242; 243, 244), so that part of the second component flowing into the chamber housing (1) flows through the inclined channel to the constriction, there through the front Axial bore (22) entering the first component mixes, ver burns in the rear axial bore (21) and flows out of this into the chamber housing (1).

ONLY FOR INFORMAHON

Code used to identify PCT contracting states on the header sheets of scriptures that are international

Publish registrations according to the PCT.

AT Austria FR France MR Mauritania

AU Australia GA Gabon MW Malawi

BB Barbados GB United Kingdom NL Netherlands

BE Belgium HU Hungary NO Norway

BG Bulgaria rr Italy RO Romania

BJ Benin JP Japan SD Sudan

BR Brazil KP Democratic People's Republic of Korea SE Sweden

CF Headquarters Aürüan Republic KR Republic of Korea SN Senegal

CG Congo u Liechtenstein SU Soviet Union

CH Switzerland LK Sri Lanka TD Chad

CM ^" Cameroon LU Luxembourg TG Togo

DE Germany, Federal Republic of MC Monaco US United States of America

DK Denmark MG Madagascar

FI Finland ML Mali

description

Burning device

In combustion processes like those in modern ones

In an open system, the fuel and oxidizer are burned in a combustion chamber and the combustion gases exit as a jet from an opening in the combustion chamber. The gas jet can be used, for example, as a drive means in aircraft and spacecraft or turbines, but it can also be used for other purposes, such as heating purposes. In open systems, a high flow rate at which the fuel and oxidizer flow into the combustion chamber has an unfavorable effect on the ignition behavior. The range of the mixing ratio of fuel and oxidizer in which it is ignitable (ignitability range) becomes smaller with an increase in the flow velocity or the combustion chamber pressure.

If that is necessary for ignitability

Mixing ratio between fuel and oxidizer is not 2. Burning device according to claim 1, characterized in that the injector tube (25) consists of a base part (26) with the rear axial bore (21) and a coaxial injector needle (27) movable in the longitudinal direction in the base part (26) with the front axial bore ( 22), whereby the total cross-section of the inclined channel (243, 244) can be changed by moving the injector needle (27) in the axial direction. (Fig. 4).

3. Burning device according to claim 1 or 2, characterized in that the injector tube (2) has cooling fins (28) on its outside to enlarge the surface (Fig. 5).

4. Burning device according to claims 1 to 3, characterized in that the injector tube (2) is angled.

5. Burning device according to claims 1 to 3, characterized in that the injector tube (2) is curved in an arc shape.

6. Burning device according to claims 1 to 5, characterized by a cylindrical chamber housing (1) with a head part (11), wherein the head part (11) for receiving the injector tube (2) has a central bore (12) around which several Nozzles (131-136) are arranged as feed devices for the second component.

7. Burning device according to claims 1 to 6, characterized in that the injector tube (2) consists of a catalytic material. described, whereby oxygen and air are used as oxidizers. The aim of the combustion device is to combine the use of oxygen for the purpose of as complete combustion as possible with a small flame volume in order to avoid the

On the other hand, using pure oxygen cannot reduce the high temperatures that can be achieved by using a large flame volume. For this purpose, pure oxygen is supplied through a central pipe with a nozzle and the fuel is supplied in a larger surrounding pipe. Shortly before the nozzle, a small portion of the fuel enters an oxygen pre-combustion chamber through inclined channels, swirls with the oxygen there and then burns in the pre-combustion chamber with a small, very hot flame, which completely evaporates the main amount of fuel around it. The combustion air is fed into a third pipe concentrically surrounding the fuel pipe, which then burns with the vaporized, partially atomized and very reactive fuel. The main combustion in the above-described combustion device with the combustion air takes place in a plane given by the nozzle orifices. At this level, the two reactants, vaporized fuel and air, exit the nozzle at the same time, a stoichiometrically sufficient amount being available in relation to the total amount of oxidizers present, pure oxygen and air. In this combustion device, no problems are dealt with which result from substoichiometric combustion, ie from the combustion of a lean mixture, in particular at high flow velocities. The invention is therefore based on the object of creating a combustion device for the combustion of a flowable fuel with a flowable oxidizer, by means of which the ignition problems that occur in particular with lean mixtures are avoided.

To solve this problem, the invention is based on a combustion device for burning a combustible mixture of two flowable components, of which at least one is at high pressure or at a higher pressure

In the case of a very high-energy combustion in the injector pipe, it may be necessary in a further development of the invention to provide the injector pipe with cooling fins on its outside. This results in a higher heat transfer to the second component flowing along the outside of the injector tube, for example the oxidizer.

Fig. 1 shows a burning device with a

Chamber housing and an injector tube,

3 shows a non-adjustable injector tube,

4 shows an adjustable injector tube,

FIG. 4A an exploded view of the adjustable injector tube according to FIG. 4,

4C shows the adjustable injector tube according to

Figure 4 with almost closed inclined channels

5 shows an injector tube with cooling fins and

6 shows a combustion chamber housing with an angled injector tube.

FIG. 1 shows a perspective, partially cut-away representation of a combustion device with a chamber housing 1 and an injector tube 2. The chamber housing 1 is used to burn a flowable fuel with a flowable oxidizer at a high combustion chamber pressure or high inflow velocity. The term “flowable substance” is to be understood as meaning all liquids, gases or emulsions, but also mixtures of liquids or gases with solid particles which, however, have flowable properties. As an example embodiment, FIGS. 1 and 2 show a cylindrical chamber housing 1 with a disk-shaped head part 11, the head part 11 for receiving the injector tube 2 being provided with a central bore 12 (FIG. 2) around which several nozzles 13 are arranged as a supply means for the second component of a combustible mixture. In FIG. 2, for example, the nozzles 131-136 are visible. However, the number or position of the nozzles 13 is not essential to the invention. The combustion gases exit the chamber housing 1 through the outlet opening 15 as a jet.

Angle α in the direction of the front axial bore

242, the second component flowing to the constriction 23 exerts a suction effect on the first component entering through the front axial bore 22. The cross-sectional area of all inclined channels 241, 242 together with the cross-sectional area of the front axial bore 22 is larger than the cross-sectional area of the constriction 23. The cross-sectional area of all inclined channels 241, 242 is therefore not added to the cross-sectional area of the constriction 23 even if the inclined channels 242, 242 are completely or partially open into the constriction 23.

Injector tube adjustment, as shown in Figures 4B and 4C. The combustion in the injector tube 2 can thus be influenced by enlarging or reducing the inclined ducts 241, 242. The above-described decoupling of the combustion behavior of the combustion device from the leanness of the mixture does not exist if the first component is fed to the chamber housing 1 only through a hollow needle protruding into the chamber housing 1, with or without a nozzle. This can lead to such lean mixtures that the ignitability is not reached. The rear axial bore contains a very rich mixture, since the larger part of the second component flows outside of the injector tube 2 and only the smaller part of the second component entering the injector tube 2 through the inclined channels 241, 242 reacts with the first component in the injector tube 2 . The portion of the second component flowing along this outside of the injector tube 2 acts as a sheath flow and thus prevents the heat of the

Temperature gradient between the jacket flow and the outer walls for which heat loss is decisive. This means that more energy remains in the combustion gases and the overall combustion is more efficient. During the combustion in the rear axial bore 21 of the injector tube 2, those parts of the second component which pass through the inclined channels 241, 242; 243, 244 get into the injector tube 2 with the first component entering through the front axial bore 22. During this combustion, however, unburned residues can get from the injector tube 2 into the chamber housing 1 for various reasons. At the edge zones of the core flow to the surrounding sheath flow, reactions then occur between the second component located in the sheath flow, which did not get into the injector tube 2 through the inclined channels 241 - 244, and the unburned residues of the first component, which passed through the injector tube 2 has entered the chamber housing 1. Unburned residues of the first component can occur in the following cases:

- If one or both components are inhomogeneous.

On the other hand, this means that if the first component has the highest possible energy content, it cannot completely react with the second component, which enters the injector tube 2 through the inclined channels 241-244, in the rear axial bore 21 of the injector tube 2.

Axial bore 21 has a significant influence on the burnout in such cases.

List of reference symbols

Chamber housing

Headboard central hole

Nozzle 131-136 Nozzles open chamber housing at the front

Outlet opening

Injector tube rear axial bore front axial bore

Injector tube with variable cross-section of the inclined channels

Basic part

Injector needle

Cooling fins

Ignition probe

Claims

1. Burning device for burning a combustible

Mixture of two flowable components, at least one of which is supplied at high pressure or high speed, with a housing with a chamber, means for supplying the first and the second

Component and their mixing and an outlet opening for the combustion gases, characterized by an injector tube (2) as a supply means for the first component, which protrudes into the chamber housing (1) in the direction of its outlet opening (15) and at its for

Outlet opening (15) oriented towards the end a rear axial bore (21), at its end facing away from the outlet opening (15) a narrower front axial bore (22), between the two bores (21,22) a narrow point (23) and at least one radial and oblique to

Injector axis (i) from the interior of the chamber housing into the constriction (23) or in its vicinity into the front axial bore (22), with its inner end pointing in the direction of the rear axial bore (21) inclined channel (241, 242; 243, 244) through which part of the second component flowing into the chamber housing (1) flows to the constriction (23) or into the front axial bore (22), mixes there with the first component, after which this mixture is at least partially in the rear axial bore ( 21) burns and flows out of this into the chamber housing (1).

2. Burning device according to claim 1, characterized in that the injector tube (25) consists of a base part (26) with the rear axial bore (21) and a coaxial injector needle (27) movable in the longitudinal direction in the base part (26) with the front axial bore ( 22), whereby the total cross-section of the inclined channel (243, 244) can be changed by moving the injector needle (27) in the axial direction. (Fig. 4).

7. Burning device according to claims 1 to 6, characterized in that the injector tube (2) consists of a catalytic material.

8. Burning device according to claims 1 to 6, characterized in that the injector tube (2) is provided with a catalytic material.