DE102014105166B3 - Swirl generator for a burner and provided therewith mixing device and provided burner - Google Patents

Abstract

The invention relates to a swirl generator (10) for a burner for generating a swirl about a swirl axis (16) on a fluid flowing in the direction of the swirl axis (16), with at least one first extending in a radial direction at least partially obliquely to the swirl axis (16) extending guide vane (20a) and a second extending in a radial direction at least partially obliquely to the spin axis (16) extending vane (20b), so that between the guide vanes (20, 20a, 20b) a swirl-generating fluid passage (24 and a fluid flow changing means (12) for selectively changing a fluid flow passing through the swirl generator (10), characterized in that the fluid flow changing means (12) comprises at least one control blade (42) relative to the first (20a) and second guide vane (20b) is arranged axially displaceable at least with a directional component such in that the control blade (42) is movable axially in one direction deeper into a region of the fluid passage (24) between the first (20a) and second guide vanes (20b) and less deeply out of the axial direction in the other direction Area of the fluid passage (24) between the first (20a) and second guide vane (20b) is movable out.

Description

The invention relates to a swirl generator for a burner, a mixing device for a burner provided with such a swirl generator and a corresponding burner provided with such a swirl generator and / or such a mixing device.

The invention is in the field of burners, in particular in the field of oil, gas and dual fuel burners, which are operated with liquid and / or gaseous fuels. In particular, the invention is in the field of burners, as generally in the company publication "Product information on oil, gas and dual fuel burner, WM30 for oil, gas and binary" Max Weishaupt GmbH, print no. 83211601 of November 2013, distributed among other things via the Internet and the company publication "Weishaupt Monarch burner WM50, print no. 83213801 of January 2013, are shown and described.

It is already known, such burners with swirling means for generating a swirl in fluid streams, in particular in the combustion air and / or -. in premix burners - to produce in a stream of a fuel / air mixture.

A swirl generator for a premix burner and a corresponding mixing device and such a burner head and premix burner are particularly in the EP 1 462 716 B1 and the prior art cited therein.

Another premix burner with swirl generator is from the EP 0 936 406 B1 known; However, this burner is a burner for a gas turbine, whereas the invention is directed primarily to burners for heat generation in heating systems or industrial equipment of the type mentioned in the aforementioned Weishaupt company publications. That from the EP 0 936 406 B1 for gas turbine burner known concept is the NOx reduction; Due to the so-called vortex effect, flue gas is sucked into the core. The conditionally high exit velocities of the gas stream.

In order to obtain flame characteristics, e.g. In order to optimize the length of the flame and / or its formation and / or its stabilization, it is further known to adjust the fluid flows through a burner, also in conjunction with a swirl generator, by means of fluid flow modifying means for selectively altering a fluid flow passing through the swirl generator.

From the DE 42 28 817 A1 a burner for a gas turbine with a tangential swirl generator is known. The swirl generator is annular and comprises annular discs, which are profiled frontally with interlocking claws and control by mutual axial displacement of the cross section of the tangential channels formed by claws. It is emphasized that, in any case, there are self-contained, profiled and converted channel structures over the entire channel length, at which no significant aerodynamic disturbance factors occur on the inlet side nor on the downstream side, so as to form a high degree of twist quality and rotational vortex geometry in the primary zone for the purpose of gas turbine burners is advantageous.

A similar concept with a closed in the axial direction and formed with tangential channels swirl generator, wherein the flow cross section of the tangential channels is adjustable by axial displacement of annular discs is in the DE 42 20 060 A1 described.

Other known swirl generator with Fluidstromveränderungseinrichtungen work with eg vanes, which are adjustable in their angle of attack, including a rather complicated and therefore expensive and vulnerable Anstellwinkelmechanismus, which is difficult to hire with actuators, is provided. Examples of this can be found in the WO 2010/132911 A2 , of the GB 2 253 476 A and the GB 899 766 A ,

In a further principle for changing the generation of swirl, a swirl generator is assigned a fluid flow changing device, which is provided by relative rotation of diaphragm elements with fluid passages about an axis of rotation coincident with the swirl axis. Examples of such swirl generators with fluid flow changing device are in the EP 0 683 884 B1 , of the DE 20 2005 011 690 U1 and the DE 10 2007 053 658 B4 disclosed.

In a further principle for changing the swirl generation, the fluid flow changing device has an adjustable division of the fluid flow into a plurality of partial flows, wherein a partial flow is passed through a fixed invariable swirl generator and a further partial flow past it. The swirl generation is influenced by adjusting the proportion of swirling

the swirl generator guided fluid flow. Such swirl generator with fluid flow changing means are for example in the DE 10 2011 082 306 A1 or the DE 10 2011 082 305 A1 disclosed.

Another approach to building a Fluidstromveränderungseinrichtung for changing a by a swirl generator directed fluid flow is in the EP 0 650 012 A1 disclosed. Here, the fluid flow is passed through flexible hoses whose respective ends are arranged on relatively rotatable disc elements, so that the curvature of the tubes is changed by a relative rotation of the disc elements. Depending on whether the fluid flow is passed through more or less curved hoses, more or less twist is generated.

At one in the EP 0 857 915 B1 disclosed torch is moved in the axial direction in total in order to influence the swirl generation at the open end of the burner head. As a result, for example, a free flame front can be stabilized at a distance downstream of the burner head.

And with that from the DE 10 2012 007 884 A1 known burner, the swirl generator at least a first group of distributed over the circumference of the flow channel deflecting means, in particular vanes, for generating the swirl and a second group of corresponding deflection means, which also generate swirl, in particular vanes. The deflection means of the second group are held stationary relative to each other on a support structure, wherein the support structure for changing the impressed twist along the flow channel is axially displaceable and / or rotatably provided about the longitudinal axis of the flow channel. The two groups are spatially separated from each other by either being arranged in different concentric regions or arranged in different axial regions.

All previously known adjustable swirl generators - such as e.g. Adjustable in angle of attack vanes or other adjustable deflection - are manufactured with a comparatively large design effort and / or prepare even in an optimal setting a relatively large flow resistance. In particular, in the known concepts, high swirl numbers also cause a high pressure loss.

Especially with the burners of the type in question, the fluid flow is usually driven by the burner arranged on the burner or associated motors driven, which are electrically operated and consume energy accordingly. In this respect, it is undesirable if such motor-driven blower must work at high power against high flow resistance.

The object of the invention is to provide an adjustable in its flow characteristics swirl generator, which can be constructed inexpensively by simple means, is easily controlled and also offers a reduced flow resistance.

This object is achieved by a swirl generator with the features of claim 1.

A mixing device for a burner provided with such a swirl generator and a burner provided with such a swirl generator and / or such a mixing device are the subject matter of the subsidiary claims.

Advantageous embodiments of the invention are the subject of the dependent claims.

The invention provides a swirl generator for a burner and / or for a mixing device for a burner, for generating a swirl axis directed swirl (axial swirl) on a fluid flowing in the direction of the swirl axis, with at least one first extending in a radial direction at least partially extending obliquely to the spin axis vane and a second extending in a radial direction at least partially extending obliquely to the spin axis vane, so that between the vanes a swirl-generating fluid passage is formed and with a fluid flow changing means for selectively changing a flowing through the swirl generator fluid flow, wherein the fluid flow changing device has at least one control blade which is arranged so as to be axially displaceable relative to the first and second guide vanes, at least with a directional component, such that the control blade is displaced by axial displacement In one direction, it is movable further into a region of the fluid passage between the first and second vanes, and less axially movable out of the fluid passage area between the first and second vanes by axial displacement in the other direction.

It is preferred that the at least one control blade extends parallel to the spin axis.

It is preferred that the control blade is arranged in the flow direction in front of the first and / or the second vane.

It is preferred that the first and second vanes are part of a vane group having a plurality of vanes for generating the swirl, wherein between each adjacent vanes each formed by inclined surfaces fluid passages for swirling formation and that the at least one control sheet is part of a control sheet group with a plurality of control blades wherein the vane group and the control blade group are axially displaceable relative to one another in such a way that control blades of the control blade group at least partially axially directed direction in at least a portion of the fluid passages formed between the guide vanes engageable retractable and in an at least partially axially directed opposite direction from the fluid passages can be moved out.

It is preferable that the vanes in the vane group are immovably connected to each other and / or that the control sheets in the control sheet group are immovably connected to each other.

It is preferable that the control blade group is arranged in the flow direction in front of the vane group.

It is preferred that the vane group comprises an annular arrangement of the guide vanes which are fixed with their radially inner end portions to a radially inner support structure and / or are fastened with their radially outer ends to an annular outer support structure and that on at least one support structure a guide is provided for relatively displaceable axial guidance of the control blade group relative to the vane group.

It is preferred that the at least one control blade is axially movable relative to the guide vanes only limitedly between a first end position and a second end position.

It is preferred that the at least one control sheet is formed by a flat plate and / or at least one sheet.

It is preferred that the at least one control blade has at least one bead formation and / or rib formation for stiffening.

According to a further aspect, the invention provides a mixing device for a burner for mixing - in particular liquid or gaseous - fuel with air, with a swirl generator according to one of the aforementioned embodiments for adjustable Verdrallen at least a portion of the air stream and / or an air-fuel fluid mixture stream.

It is preferred that the swirl device is designed to swirl a partial air flow. Preferably, the distribution of the total air flow into a twisted partial air flow and an untwisted partial air flow can be adjusted by the adjustment of the swirl device according to the invention. This is done particularly advantageously by adjusting the flow cross-section in a swirl generator, so that more or less air flows through the swirl generator or past it.

According to a further aspect, the invention relates to a burner head for a burner, comprising a burner tube for guiding a combustion air flow and / or an air-fuel mixture flow, a mixing device for mixing fuel with the combustion air flow and a swirl generator according to one of the previously explained embodiments for adjustably displacing the airflow and / or the mixture fluid flow.

In a particularly preferred embodiment, the mixing speeds (= mixing pressure) can be kept increased over a large burner load range at the same time - which benefits the combustion quality. In addition, preferably by the axial closing of the swirl channels, an air bypass to the outside around the swirl generator around.

Preferably, located outside, disposed within the flame tube, a plurality of gas pipes with gas outlet nozzles. Higher air speeds mean better fuel / combustion air mix.

According to a further aspect, the invention relates to a burner or a burner device with such a burner head and / or with a mixing device with the adjustable swirl generator and a control device which is adapted to a flame length and / or a flame shape and / or a flame position by controlling the Adjust fluid flow changing means of the swirl generator.

Preferably, a burner as shown in the aforementioned Weishaupt company publications is provided with the adjustable swirl generator. In particular, a mixing device of the burner is provided with the adjustable swirl generator.

According to one possible embodiment, the burner is a premix burner, wherein the swirl generator is assigned to the mixing device of the premix burner.

Most preferably, however, the swirl generator is assigned to a mixing device of a duoblock industrial burner, as described in the attached company publication, printed no. 83159801, described and shown.

Preferably, the swirl generator is associated with a mixing device of a diffusion burner - i. the mixture of fuel - combustion air takes place at the burner mouth / flame head outlet.

Particularly preferably, the burner is a diffusion burner with partial premix.

Preferably, the mixing means is adjustable swirl generator and provided with a passage for passing air past the swirl generator. By closing the swirl cross-sectional area, more air flows axially past the swirl and the rotation downstream decreases.

In a particularly preferred embodiment, for the purpose of a cross-sectional reduction in the blade channels of an axial swirl generator with guide vanes with angles of incidence of e.g. 45 ° (+/- 20 °) to the direction of flow, a second Axialleitgitter with control blades - the e.g. can also be formed like a shovel - retracted. The e.g. also formed as vanes control blades can be aligned parallel to the direction of flow.

By this arrangement or procedure, the Ausströmquerschnitte / Abströmquerschnitte the respective individual blade channel can be reduced to production-related leakage cross-sections. This results in the ability to keep the mixing speeds of the combustion air with fuel as high as possible or to optimize for the operation of a mixing device in intermediate load and / or low load.

The twisting of air streams or partial air streams through a mixing device is an effective known measure for changing the flow field after the mixing device or the flame shape and flame length.

A particularly preferred method for easily changing an air flow through an axial swirl grille by means of axial adjustment of a second guide grid or control grid with a plurality of control blades.

The angles of the control blades of the "guideways" or "driving control grids" that can be moved relative to the swirl grille do not necessarily have to be parallel to the direction of flow, but can also be set at an angle. Preferably, the angle of attack of the control blades of the control grid is substantially smaller than the angle of attack of the guide vanes of the axial swirl lattice. More preferably, the control blades are provided with an angle of attack equal to zero, i. run parallel to the direction of flow and also parallel to the spin axis.

Preferably, the Axialdrallerzeuger is designed so that the guide vanes have an overlap in the axial direction and also the vanes and the control blades have an overlap in the axial direction to effect a particularly effective throttling by cross-section reduction.

A significant advantage is a minimal (more) pressure loss (especially in the open position), which only arises through the actual axial twist. The second, axially movable control grid caused due to its control blade arrangement - angle of attack 0 ° or only a very small angle of attack - virtually no or only a very small pressure loss.

Preferably, the relative travel between the guide vanes and the control blades and / or the execution of the control leaves of the driving control grid are chosen so that a guide and / or centering by acting as a support structure outer ring of the vane group - actual axial swirl generation - is possible.

Preferably, the control blades are designed with beads to allow maximum stiffness even with thin sheet thicknesses. Other design principles for stiffening are possible.

The swirl strength and / or the swirl number - the ratio of angular momentum to axial momentum - is reduced by the approach (retraction of the control blades between the guide vanes) in the selected arrangement, since the effective swirl vanes length decreases as the two grids are moved in and thus into each other and thereby the deflection angle of the flow becomes flatter. This is preferably done in such a way that the air can flow around the swirl generator.

Despite the particularly simple design, which allows both a cost-effective manufacturability and a particularly simple control by servomotors or the like with very simple gearboxes, the ability to reduce the flame length of burners in high load and intermediate load, more than sufficient.

An embodiment of the invention will be explained in more detail with reference to the accompanying drawings. It shows:

1 a side view of a swirl generator with a group of vanes and a Fluidstromveralterseinrichtung with a group of control blades, the vanes or control blades are partially broken away for clarity, in an end position "OPEN";

2 the swirl generator of 1 in an intermediate position;

3 the swirl generator of 1 and 2 in an end position "CLOSED";

4 the swirl generator after 1 in the end position "OPEN" with the arrangement of vanes and control leaves, but shown without external support structures;

5 a representation comparable to 4 with the swirl generator in the intermediate position;

6 a representation like in 4 the swirl generator in the end position "CLOSED";

7 an enlarged detail of 4 ;

8th an enlarged detail of 5 ; and

9 an enlarged detail of 6 ,

In the 1 to 9 is a preferred embodiment of a swirl generator 10 for a burner with a fluid flow changing device 12 shown.

The swirl generator 10 serves to generate a twist at one in the flow direction 14 flowing fluid, so that a swirling movement of the fluid about one in the flow direction 14 directed spin axis 16 arises around. In the embodiment of the swirl generator shown 10 falls the spin axis 16 with a central center axis of the annular swirl generator 10 together. The swirl generator 10 such training is also referred to as axial swirl generator.

To create the around the spin axis 16 The swirl generator is directed around the fluid flowing in the axial direction 10 a vane group 18 with several in one with respect to the spin axis 16 in the radial direction extending vanes 20 on. The vanes 20 are with respect to the flow direction 14 with an oblique angle of attack 22 (please refer 7 ), so that between adjacent vanes, for example, between a first vane 20a and a second vane 20b , one according to the angles of attack 22 slanted fluid passage 24 is formed.

The vanes 20 . 20a . 20b are arranged in the circumferential direction one behind the other, so that the radially leading edge in the circumferential direction 20ak the first vane 20a with the circumferential radial edge in the circumferential direction 20BK the circumferentially adjacent second guide vane 20b coincides or to a lesser extent an overlap of the edge areas 62 when viewed in an axial direction.

A radially inner end of the respective vanes 20 is firmly attached to a first inner ring 26 attached, which has an inner support structure 28 for the vanes 20 forms.

The radially outer ends of the vanes 20 are firmly attached to a first outer ring 30 attached, which has an outer support structure 32 forms.

For fastening the vanes 20 . 20a . 20b at the respective rings 26 . 30 are the outer ends of the vanes 20 eg with projections 34 provided, the corresponding recesses on the rings 26 . 30 (not shown) engage positively. Cohesive connections, eg by welding, are possible.

Through the inner support structure 28 , the vanes 20 and the outer support structure 32 is an annular guide grid 36 formed, which can for example be fixedly fixed in or on a burner tube, not shown, of a burner in the region of a mixing device.

The fluid flow changing device 12 serves to selectable changing by the swirl generator 10 flowing fluid stream. In particular, the fluid flow changing device is used 12 for adjusting a twist and / or for adjusting the swirl velocity and / or swirl number and for adjusting the flow velocity and / or the flow rate of the fluid flow.

The fluid flow changing device 12 has a tax sheet group 40 with an arrangement of control sheets 42 on, for intervention in fluid passages 24 between the vanes 20 . 20a . 20b are formed.

Each tax sheet 42 is similar to shovel blade comparable to the vanes 20 . 20a . 20b formed, however, is a much lower angle of attack to the flow direction 14 or to the spin axis 16 for the control sheets 42 in comparison to the angle of attack 22 the vanes 20 . 20a . 20b intended.

In the illustrated preferred embodiment, the control blades 42 the angle of attack 0 °, ie they are parallel to the flow direction 14 and the spin axis 16 aligned in the axial direction and in the radial direction.

For example, each control sheet 42 formed from a sheet of sheet metal and thus as a flat plate 44 or flat sheet formed. Preferably, however, is such a plate 44 for stiffening purposes with a bead training 46 , eg with one or two beads 48 , Mistake.

An inner end of each control sheet 42 is with a second inner ring 50 as an inner support structure 52 connected. The radially outer ends of control leaves 42 are with a second outer ring 54 as a second outer support structure 56 connected.

This is due to the second inner ring 50 , the control sheets 42 and the second outer ring 54 a Steuerleitgitter or control grid 58 formed, which like the Leitgitter 36 is annular and instead of oblique angle 22 provided vanes 20 . 20a . 20b with (substantially) axially aligned control blades 42 is provided for engaging between each two adjacent vanes 20 . 20a . 20b are formed.

For this each tax sheet has 42 one over the second rings 50 . 54 towards the baffle 36 projecting intervention area 60 , whose radially outer end for engaging in the first outer ring 30 is formed such that the radially outer edges of the control leaves 42 inside on the first outer ring 30 can support. The free axial edge area of the engagement areas 60 is so far from the second rings 50 . 54 formed above, that he plant one of the two second rings 50 . 54 at the corresponding first ring 26 . 30 on the circumferentially facing remote radial edge region 62 the vanes 20 . 20a . 20b is applied. The contour of the free axial edge of the engagement area 60 is according to the contour of this remote edge area 62 the vanes 20 . 20a . 20b customized.

Inside the control grid 58 are the control sheets 42 stationary on their support structures 52 . 56 arranged so that the control sheets 42 are immobile relative to each other.

The entire tax sheet group 40 , in particular through the control grid 58 is formed, but can be at least one direction component axially in the flow direction 14 (parallel to the spin axis 16 ) move. For this purpose, a form-fitting guide attack between the Eingreifbereich 60 and the first outer ring 30 the vane group 18 as a leadership; Other guides such as sliding guides, telescopic guides or the like - including with axial tongue and groove sliding guides or the like - can be provided.

In the 1 to 3 are the vane group 18 with the guide grid 36 and the tax sheet group 40 with the control grid 58 together with the respective rings 26 . 30 . 50 . 54 shown, with some of the vanes 20 and control sheets 42 have been omitted for better representation. In the 4 to 6 is the swirl generator 10 without the outer rings 30 . 54 represented and in the 7 to 9 are the interlocking structures of the control blades 42 and the vanes 20 . 20a . 20b of the 4 to 6 shown in greater detail.

In each of these groups of figures 1 to 3 . 4 to 6 and 7 to 9 is in each case a first end position in the fully open position (FIG. 1 . 4 and 7 ), an intermediate position ( 2 . 5 and 8th ) and a completely closed end position ( 3 . 6 and 9 ).

As in particular in the 7 to 9 you can see the control grid 36 axially between the in 7 shown end position "OPEN" and the in 9 shown end position "CLOSED" and back axially relative to the guide grid 36 move, taking the control sheets 42 more or less in the fluid passages 24 between the adjacent vanes 20a . 20b intervention. As a result, the cross section of the fluid passages can be easily achieved 24 according to the respective requirements. At the same time, this allows the swirl, in particular swirl number and swirl impulse, to be influenced.

In the in 7 (and 1 and 4 ) fully opened position provides the tax sheet group 40 with the control angle aligned with 0 (or possibly with a very low angle of attack) 42 a very low flow resistance for the fluid flow. In contrast, in the in 9 (and 3 and 6 ) end position "CLOSED" almost complete closure of the fluid passages 24 to reach.

Such an axial displacement for adjusting the fluid flow is also easily adjustable at the end of a burner head of a burner and to be handled by actuators or actuators. At the same time such a pure displacement movement can be easily realized mechanically, so that a very reliable construction can be achieved.

Next is such a swirl generator 10 produce with very simple means and in a structurally very simple way.

As this particular in the 7 to 9 is shown, the relative position of the vanes 20 . 20a . 20b and the control sheets 42 selected in the circumferential direction such that the engagement regions 60 the control leaves near the circumferentially rear edges 20BK the guide vanes are guided and can be supported on these edges. This will make the control sheets 42 across from the fluid passages 24 supported by flowing flow. In addition, an effect of self-centering is achievable.

The in the 1 to 9 swirl generator shown is preferably used in the range or in a mixing device of a burner, as described in more detail in the company publication "Industrial burner WK, print no. 83159801 "of Max Weishaupt GmbH is described and shown.

The swirl generator 10 is to be provided in particular as part of a mixing device in or on a burner tube of a burner head of the burner. The burner is designed in particular diffusion burner. In a particularly preferred embodiment, the burner is configured as a diffusion burner with partial premixing. In another possible design, the burner is designed as a premix burner, with which gaseous fuel in the region in front of the swirl generator 10 mix with a blown into the burner tube blown combustion air, wherein the fuel-combustion air mixture by means of the swirl generator 10 is twisted.

Preferably, a further passage for combustion air is formed on the outside around the swirl generator in the flame tube, so that a first partial air flow for swirling through the swirl generator 10 and a second partial air flow on the outside of the swirl generator 10 passed by. By adjusting the swirl generator 10 the ratio of the distribution of combustion air into these partial air flows can be adjusted.

The fluid flow changing device 12 is connected to a servomotor (not shown) or the like actuator (eg linear actuator) connected to the control grid or grid 58 relative to the baffle 36 moves axially. To the actuator, a control device is connected, which is adapted to control the relative displacement according to a desired flame property (eg flame length, flame shape, flame position, position of a flame front).

Alternatively, such a swirl generator can also be used in the burners, as described in the company publication "WM30 for oil, gas and binary", Druck-Nr. 83211601 or "Weishaupt Monarch burner WM50", printed no. 83213801 of Max Weishaupt GmbH are described and shown.

LIST OF REFERENCE NUMBERS

10

 swirl generator

12

 Fluid flow varying means

14

 flow direction

16

 spin axis

18

 Leitschaufelgruppe

20

 vanes

20a

 first vane

20ak

 leading edge first vane

20b

 second vane

20BK

 rear edge second vane

22

 angle of attack

24

 fluid passage

26

 first inner ring

28

 inner support structure

30

 first outer ring

32

 outer support structure

34

 head Start

36

 guide grid

40

 Tax Gazette Group

42

 tax Gazette

44

 flat plate

46

 Sick training

48

 Beading

50

 second inner ring

52

 second inner support structure

54

 second outer ring

56

 second outer support structure

58

 control grid

60

 engaging portion

62

 remote edge area of the vanes

Claims (11)

Swirl generator ( 10 ) for a burner for generating one about a spin axis ( 16 ) directed at one in the direction of the spin axis ( 16 ) flowing fluid, with at least one first extending in a radial direction at least partially obliquely to the spin axis ( 16 ) extending vane ( 20a ) and a second extending in a radial direction at least partially obliquely to the spin axis ( 16 ) extending vane ( 20b ), so that between the guide vanes ( 20 . 20a . 20b ) a swirl-producing with an angle of attack ( 22 ) obliquely to the spin axis ( 16 ) running fluid passage ( 24 ) is formed and with a fluid flow changing means ( 12 ) for selectively changing one by the swirl generator ( 10 ) flowing fluid stream, characterized in that the fluid flow changing device ( 12 ) at least one control sheet ( 42 ), which relative to the first ( 20a ) and the second vane ( 20b ) is arranged axially displaceable at least with a directional component such that the control blade ( 42 ) by axial displacement in one direction deeper into a region of the fluid passage ( 24 ) between the first ( 20a ) and the second vane ( 20b ) and less axially movable in the other direction out of the area of the fluid passage ( 24 ) between the first ( 20a ) and second vane ( 20b ) is movable out. Swirl generator ( 10 ) according to claim 1, characterized in that a) that the at least one control sheet ( 42 ) parallel to the spin axis ( 16 ) or b) that the at least one control sheet ( 42 ) with an angle of attack obliquely to the spin axis ( 16 ). Swirl generator ( 10 ) according to any one of the preceding claims, characterized in that the first ( 20a ) and the second vane ( 20b ) Part of a vane group ( 18 ) with a plurality of guide vanes ( 20 ) for generating the twist, wherein between adjacent guide vanes ( 20 ) in each case the fluid passages bounded by oblique surfaces ( 24 ) are formed for swirl generation and that the at least one control sheet ( 42 ) Part of a tax sheet group ( 40 ) with several control sheets ( 42 ), wherein the vane group ( 18 ) and the tax sheet group ( 40 ) are axially displaceable relative to one another such that control blades ( 42 ) of the tax sheet group ( 40 ) in an at least partially axially directed direction in at least a part of the between the guide vanes ( 20 ) formed fluid passages ( 24 ) einfahrbar and in an at least partially axially directed opposite direction of the fluid passages ( 24 ) are herausfahrbar. Swirl generator ( 10 ) according to claim 3, characterized in that the guide vanes ( 20 ) in the vane group ( 18 ) are immovably connected to each other and / or that the control sheets ( 42 ) in the tax sheet group ( 40 ) are immovably connected to each other. Swirl generator ( 10 ) according to claim 3 or 4, characterized in that the vane group ( 18 ) an annular arrangement of the guide vanes ( 20 ), which with their radially inner end regions on a radially inner support structure ( 28 ) and / or with their radially outer ends on an annular outer support structure ( 32 ) and that on at least one support structure ( 28 . 32 ) a guide to the relatively displaceable axial guidance of the control blade group ( 40 ) relative to the vane group ( 18 ) is provided. Swirl generator ( 10 ) according to one of the preceding claims, characterized in that the at least one control sheet ( 42 ) relative to the guide vanes ( 20 ) is limited axially movable only limited between a first end position and a second end position. Swirl generator ( 10 ) according to one of the preceding claims, characterized in that the at least one control sheet ( 42 ) through a flat plate ( 44 ) and / or at least one sheet is formed. Swirl generator ( 10 ) according to one of the preceding claims, characterized in that at least one control sheet ( 42 ) at least one bead training ( 46 ) and / or rib formation for stiffening. Mixing device for a burner, for mixing fuel with air, characterized by at least one swirl generator ( 10 ) according to any one of the preceding claims for adjustable twisting of the air flow and / or an air-fuel-fluid mixture flow. Burner head with a burner tube for guiding a combustion air flow, a mixing device for mixing fuel with the combustion air flow and a swirl generator ( 10 ) according to any one of claims 1 to 8 for adjustable twisting of the air flow and / or a fuel-air mixture fluid flow. Burner with a burner head according to claim 10 and a control device, which is designed, a flame length and / or flame shape and / or flame position by driving the fluid flow changing means ( 12 ).

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