EP1557611B1 - Flow barrier, lining and combustion chamber - Google Patents

Description

The invention relates to a flow barrier as an insert in a flow region between a first and a second cladding element of a lining of a combustion chamber. The invention leads to a fairing and a combustion chamber.

A combustion chamber, in particular the combustion chamber of a gas turbine combustion chamber of a gas turbine, is usually provided with a lining in order to insulate and protect the housing parts of the combustion chamber-carrying housing, also referred to as combustion chamber structure. The combustion chamber conditions prevailing in the combustion chamber, which are characterized in particular by strongly fluctuating and high temperatures, pressures and oxidizing effects of the hot gas, are kept away from the housing. In particular, a region of the housing is to be protected, in which the holder of the panel is attached. In the combustion chamber of a gas turbine, the thermal loads are usually in a temperature range of 1350 ° C or above and can also, for. B. subject to strong fluctuations in the context of a quick closure. Such a load, the metallic housing is usually not suspendable. The housing and the holder are therefore also to protect against a progressing with time material fatigue, the material fatigue is higher, the more frequent and larger temperature and pressure fluctuations occur in the combustion chamber.

For this reason, a fairing is attached to a combustion chamber facing the inside of a housing part. The cladding usually has a number of cladding elements. Particularly advantageous is a formed from a ceramic cladding element, as a heat shield (Ceramic Heat Shield, CHS) proven. Another possibility is to form a cladding element of a high temperature resistant metal alloy. On a metallic cladding element, a ceramic coating can be applied.

To compensate for different coefficients of thermal expansion, a gap is set in the assembly of a trim element on the entire circumference of the trim element. The cladding elements of the panel are therefore mounted at a distance. This clearance provides a flow area between a first and a second trim element of the trim.

On the one hand, a cooling air flow running between the housing part and the lining is guided during operation of the combustion chamber. This serves in particular for cooling the holder, which holds a cladding element on the inside of the housing part facing a combustion chamber. The cooling air can penetrate through the flow region into the combustion chamber. On the other hand, the gaps are to be protected from the combustion chamber side penetrating hot gas intake. For this purpose, the cooling air is guided from the housing part and the back of the panel forth in the direction of the combustion chamber, to block in this way a gap with the cooling air.

The two latter occurring in the flow area flows of cooling air on the one hand and hot gas on the other hand have a number of consequences that can be influenced by means of a high-temperature resistant flow barrier used in the flow area targeted and advantageous. The flow barrier thus has to meet a wide variety of requirements.

The flow barrier should on the one hand take account of a width of the flow region which varies as a result of thermal changes and on the other hand should be heat-resistant.

For example, porous ceramic gaskets are made of EP 1 302 723 A1 known. Although such a porous ceramic gasket is resistant to high temperatures, it must not come into direct contact with the hot gas. Since this contact in the combustion chamber is difficult to avoid, such a porous ceramic seal must be flowed through by cooling air in order to cool the seal itself and also to block the flow region from a hot gas intake. Nevertheless, in porous ceramic gaskets of the type mentioned overheating occurred. The essential reason is that a sufficient in each case a real operation of a combustion chamber flow through the porous ceramic seal with cooling air is difficult to guarantee.

Furthermore, the above-mentioned use of cooling air to block the flow area and to cool a high-temperature-resistant flow barrier has the disadvantage that the cooling air enters the combustion chamber at the edges of the cladding element and in this way very considerable temperature gradients arise along the lateral extent of a cladding element. Thus, a cladding element when using the usual concept explained here at its edge due to the cooling air outlet at a significantly lower temperature than at its center facing the combustion chamber. In addition, due to its geometric shape, a usually panel-shaped cladding element has a relatively high rigidity along its lateral extent. The high temperature gradient along the lateral extent and the stiffness along the lateral extent together lead to considerable stresses along the lateral extent of the cladding element. These are far more serious than warping stresses of the cladding element, which also occur over the thickness of the cladding element due to a temperature gradient. One way to address this problem is in the unpublished European patent application EP-1508761-A described. The problem can be addressed by a temperature-adapted design of a cladding element.

The US 5333443 A discloses a flow barrier for use in a flow region between first and second trim members of a combustor of a gas turbine engine. The flow barrier is secured to a support structure carrying the trim elements and includes a screw and a stack of rectangular stacked sheet-like seals which are urged by the screw and a coil spring surrounding the screw to seal against the trim elements. The seals are offset from each other and arranged several times, so that there is a seal of the flow area.

The US 6145452 A discloses hexagonal cladding elements of a combustor which are attached to a support structure at a central bore by means of a helical fastener made of ceramic.

The mentioned solutions do not prove to be advantageous in every respect and are ultimately relatively complex and therefore cost-intensive. It would be desirable to have a flow barrier that addresses the aforementioned problems of heat resistance, the temperature-varying flow range shape and the problems caused by the cooling air and is particularly simple. Also desirable would be a panel and a combustion chamber, which are advantageously designed over previous solutions.

At this point, the invention is whose task is to provide a flow barrier, which is resistant to heat and at the same time can be used in a variable-shape, varying in size flow area and which is as simple as possible. A further object of the present invention in terms of the lining and the combustion chamber with such a flow barrier is to take into account the problems explained in connection with the cooling air.

With regard to the flow barrier, the object is achieved according to the invention by a flow barrier for use in a flow region between a first and a second cladding element of a lining of a combustion chamber, wherein the flow barrier has a high temperature resistant ceramic body and a spring element and the high temperature resistant ceramic body and the spring element have an elongated extent, wherein the ceramic body rests along a bearing surface on the spring element, and the bearing surface is aligned along the elongate extent.

When using the flow barrier in the flow region of the high-temperature resistant ceramic body faces the combustion chamber of the combustion chamber and thus prevents the hot gas intake. The Heißgaseinzugshememmung is further improved by the supporting spring force of the spring element. The spring element itself is protected by the high-temperature resistant ceramic body from hot gas access. The spring element itself therefore only needs to meet lower requirements for high-temperature strength compared to the ceramic body. All behind the cladding element and the high temperature resistant ceramic body lying parts, including the spring element, can be effectively cooled by cooling air.

The invention has recognized that a hitherto customary porous ceramic flow barrier leads to a number of consequential problems which are avoided according to the concept of an overall high-temperature-resistant flow barrier explained here. The use of a high temperature resistant ceramic body as part of the flow barrier ensures that the flow barrier has sufficient hot gas resistance, which is independent of a cooling air flow. As appropriate, an alumina ceramic has been found. It can also be used depending on the usefulness of another high-temperature resistant ceramic. The sufficient hot gas resistance of the high-temperature resistant ceramic body has, in particular, the particularly reliable and reliable effect of the flow barrier in comparison to conventional porous ceramic flow barriers.

The combination of the high-temperature resistant ceramic body with a spring element to a flow barrier also has the effect according to the finding of the invention that the barrier effect of the flow barrier achieved by the spring force acting on the ceramic body proves to be particularly effective.

Finally, the combination of the high-temperature resistant ceramic body and the spring element to a flow barrier proves to be particularly adaptable when used in a highly variable shape and distance flow region between the first and the second cladding element as a result of temperature fluctuations.

The parts, d. H. the high-temperature resistant ceramic body and the spring element, the flow barrier can be easily manufactured and thus produced inexpensively.

The invention is thus, in departure from the known porous ceramic flow barrier, from the new and surprising in its effect consideration that compared to a porous ceramic flow barrier the flow barrier explained here with a relatively rigid high-temperature resistant ceramic body yet to a reliable sealing of the flow area leads. In combination with the spring element proves the flow barrier according to the new concept namely as sufficiently variable within the variable-shape flow area.

The high temperature resistant ceramic body and the spring element have an elongated extent, wherein the ceramic body rests along a bearing surface on the spring element and the bearing surface is aligned along the elongate extent. Such elongated spring elements can be assembled particularly easily and mounted in a flow region of a lining of a combustion chamber. Its elongated extent accounts for the elongate extent of the flow area between a first and a second trim element of the fairing.

Advantageous developments of the invention can be found in the dependent claims and specify in particular advantageous ways to realize the flow barrier, inter alia, in terms of their barrier effect, hot gas resistance and stability.

Preferably, the support surface is curved towards the spring element. In particular, the spring element on its side facing the support surface on a trough and the high-temperature resistant ceramic body on its side facing the support surface on a bulge. The bulge of the ceramic body and the trough of the spring element are suitably adapted to each other, so that the ceramic body in the spring element comes to rest securely and is secured against lateral slipping in the trough.

Furthermore, the spring element expediently has retaining means which ensure the position of the high-temperature-resistant ceramic body along the elongate extension. In this way, the ceramic body is also in an axial direction, ie in a direction of elongated extent, against a Secured slipping. As a holding means, a stop or a sufficiently rough design of the bearing surface between the spring element and the ceramic body is particularly suitable.

In a first variant of the invention, the spring element is formed at least along a fraction of the elongated extent in the form of a spring subjected to compression according to the operating principle of a disc spring. That is, the spring element is, except for its elongated extension (instead of a round in a plate spring), formed in principle like a plate spring and is based in principle on the same mechanism of action as a plate spring.

It has proved to be particularly advantageous that the spring element is formed along a further fraction of the elongated extension in the form of a bare support. It has proved to be particularly useful to form the spring element along a central part of the elongated extension in the form of a compression spring, clip-like, after the operating principle of a disc spring and form along its lateral parts of the elongated extension in the form of a bare support. The supports support the high-temperature resistant ceramic body in its edition while in the middle part of the spring force is generated. In detail, an advantageous embodiment of the first variant of the spring element is explained in connection with the drawing.

According to a second variant of the invention, the spring element is formed at least along a fraction of the elongated extent in the form of a pressure-loaded, resiliently yielding solid body. In this case, any type of material comes into consideration, which gives the solid body a pressure-loaded resilient effect. It can be a uniform solid material or a composition or a conglomerate of different materials. A cross section through the solid body advantageously has a shape that is similar to the shape of a horizontal figure eight. In detail, an advantageous embodiment of the second variant of the spring element is explained in connection with the drawing.

The object with regard to the cladding is achieved by a cladding for a combustion chamber with a number of cladding elements, wherein between a first and second cladding element, a flow region is formed, in which a flow barrier of the above type is used.

Within the scope of a further development of this cladding, it has proved to be particularly advantageous that one or more flow barriers are inserted into the flow region in such a way that the flow region is completely sealed by the one or more flow barriers. In this way, namely a hot gas intake into the flow area is completely prevented.

One or more of the flow barriers are particularly advantageously used in all flow regions extending along a circumference of a cladding element. To this In this way, a hot gas intake is avoided in all flow areas that run circumferentially around a cladding element.

The object is achieved in terms of the combustion chamber according to the invention by a combustion chamber with a lining, which has a number of cladding elements, wherein between a first and a second cladding element, a flow region is formed, in which a flow barrier of the type mentioned above is used.

• ein Verkleidungselement an der einem Brennraum zugewandten Innenseite eines Gehäuseteils mittels einer Halterung angebracht, und
• eine oder mehrere Strömungsbarrieren derart in den Strömungsbereich eingesetzt, dass der Strömungsbereich durch die eine oder mehrere Strömungsbarrieren vollständig abgedichtet ist, und
• eine zwischen dem Gehäuseteil und der Verkleidung verlaufende Kühlluftströmung durch die eine oder mehrere der Strömungsbarrieren entlang einer Ausdehnung des Strömungsbereichs zur Kühlung der Halterung abgelenkt wird.

In a particularly preferred embodiment of the combustion chamber is

• a lining element attached to the combustion chamber facing inside of a housing part by means of a holder, and
• one or more flow barriers inserted into the flow area such that the flow area is completely sealed by the one or more flow barriers, and
• a cooling air flow extending between the housing part and the panel is deflected by the one or more of the flow barriers along an extension of the flow area for cooling the support.

This concept guarantees a reliable cooling of the holder and thus a secure and permanently stable mounting of the cladding elements. By sealing the flow area, moreover, a hot gas intake into the flow area is avoided. Corrosion problems due to hot gas intake or other material loads in the vicinity of the flow region and behind the lining, in particular in the holder, are thus - in contrast to known flow barriers - eliminated.

Finally, the outflow of cooling air into the combustion chamber and thus a combustion chamber side different temperature load of the cladding element edges on the one hand and the cladding element centers on the other hand avoided. Lateral temperature gradients from the edge to the center of a cladding element are thus largely eliminated. The blocking of the cooling air thus leads to an adiabatic temperature situation in the cladding elements. Long-term damage to a cladding element, eg. As cracks are avoided. By the most extensive or complete sealing of the cooling air flow in the flow region by means of the present concept of a flow barrier, a considerable saving potential of cooling air is achieved in comparison with the previously customary concept of a porous ceramic flow barrier.

So it penetrates less cooling air into the combustion chamber itself. Not only is there a high potential for reducing the consumption of cooling air, which in turn results in a lowering of the combustion temperature. The latter also results in a reduction in NO _x emissions.

The aforementioned flow barrier design also has the advantage that larger tolerances in adjusting the column, i. the flow area between a first and a second cladding element are possible. In this way, the assembly time of the cladding elements is considerably reduced.

Embodiments of the invention are described below with reference to the drawing. This is not intended to represent the embodiments significantly, but the drawing, where appropriate for explanation, executed in a schematized and / or slightly distorted form. With regard to additions to the teachings directly recognizable from the drawing reference is made to the relevant prior art.

• FIG 1 eine besonders bevorzugte Ausführungsform einer Verkleidung für eine Brennkammer mit einer besonders bevorzugten Ausführungsform einer ersten Variante einer Strömungsbarriere in einer Querschnittsansicht;
• FIG 2 jeweils in perspektivischer Ansicht (a) und einer Querschnittsansicht (b) einen hochtemperaturfesten Keramikkörper der besonders bevorzugten Ausführungsform der ersten Variante einer Strömungsbarriere;
• FIG 3 jeweils in perspektivischer Ansicht (a) und einer Querschnittsansicht (b) ein Federelement der besonders bevorzugten Ausführungsform der ersten Variante einer Strömungsbarriere;
• FIG 4 jeweils in einer perspektivischen Ansicht (a) und einer Querschnittsansicht (b) die besonders bevorzugte Ausführungsform der ersten Variante einer Strömungsbarriere mit dem hochtemperaturfesten Keramikkörper der FIG 2 und dem Federelement der FIG 3;
• FIG 5 jeweils in einer perspektivischen Ansicht (a) und einer Querschnittsansicht (b) eine besonders bevorzugte Ausführungsform einer zweiten Variante einer Strömungsbarriere;
• FIG 6 eine besonders bevorzugte Ausführungsform einer Verkleidung für eine Brennkammer mit der besonders bevorzugten Ausführungsform der zweiten Variante der Strömungsbarriere in einer perspektivischen Ansicht;
• FIG 7 in perspektivischer Ansicht einen größeren Bereich der besonders bevorzugten Ausführungsform der Verkleidung der FIG 6 mit schematisch gezeigter Kühlluftströmung.

In detail, the figure shows in:

• FIG. 1 a particularly preferred embodiment of a lining for a combustion chamber with a particularly preferred embodiment of a first variant of a flow barrier in a cross-sectional view;
• FIG. 2 each in a perspective view (a) and a cross-sectional view (b) of a high temperature resistant ceramic body of the particularly preferred embodiment of the first variant of a flow barrier;
• FIG. 3 each in a perspective view (a) and a cross-sectional view (b) a spring element of the particularly preferred embodiment of the first variant of a flow barrier;
• FIG. 4 each in a perspective view (a) and a cross-sectional view (b) the particularly preferred embodiment of the first variant of a flow barrier with the high-temperature resistant ceramic body of FIG. 2 and the spring element of FIG. 3 ;
• FIG. 5 each in a perspective view (a) and a cross-sectional view (b) of a particularly preferred embodiment of a second variant of a flow barrier;
• FIG. 6 a particularly preferred embodiment of a lining for a combustion chamber with the particularly preferred embodiment of the second variant of the flow barrier in a perspective view;
• FIG. 7 in a perspective view of a larger area of the particularly preferred embodiment of the panel of the FIG. 6 with schematically shown cooling air flow.

Usually, in order to compensate for different thermal expansion coefficients in the assembly of cladding elements in the form of ceramic heat shields (CHS) in a combustion chamber of a gas turbine on the entire circumference of the heat shield column set. In order to protect this column, referred to below as the flow area, from hot gas intake, the flow areas are hitherto blocked with compressor discharge air. This compressor discharge air used as cooling air generates temperature gradients in the heat shield referred to below as a cladding element, which leads to thermal cracks in the cladding element during operation of the gas turbine.

Through the use of the seal hereinafter referred to as a flow barrier according to the concept of the invention, the cooling air flowing out of a flow region between the lining elements is reduced or completely suppressed. Thus, the temperature gradients that form from the edges of a cladding element towards the cladding element center and the stresses associated therewith along the lateral extent of the cladding element are significantly reduced. Due to the reduced stresses, fewer and, if any, shorter cracks will form in a cladding element during operation.

At the beginning, porous ceramic flow barriers are known. Such a known flow barrier is in the form of a double tube formed with an outer shell of high temperature resistant, ceramic Nextelgewebe and an inner shell of an Inconellgestrick, which is flexible in the composite and has sufficient length stability as well as the flow barrier on the spring force of the fabric holds in its axial position. The ends of the flow barrier are sewn with a multifilament thread.

Although such a tube-like porous ceramic flow barrier is resistant to high temperatures, it must not come into direct contact with the hot gas. Since this contact in the combustion chamber is difficult to avoid, the flow barrier must be traversed by cooling air. A sufficient flow with cooling air can not be guaranteed in every phase of a real operation of a gas turbine, so that a previously common flow barrier can have overheating. Furthermore, an insufficient flow of cooling air causes the holder of a cladding element is not sufficiently supplied with cooling air and overheated where the flow barrier fails. Overheating of the known flow barrier in the form of a flexible fabric leads to the loss of the spring force of the fabric and exacerbates the situation described above.

For these reasons, the above-discussed new concept of a high temperature resistant flow barrier according to the invention has been proposed. The proposed flow barrier withstands direct hot gas contact and provides greater passive safety against fairing bracket overheating. This will be explained in detail with reference to the following figures.

FIG. 1 shows a lining 1 for a combustion chamber with a number of cladding elements in the region of a first cladding element 3 and a second cladding element 5. Between the first cladding element 3 and the second cladding element 5, a flow region 7 is formed in the form of a gap. The risk of hot gas intake exists from the side of the combustion chamber 11. In the flow region 7 is a first variant of a flow barrier 9, which completely seals the flow region against hot gas intake, used. Furthermore, the flow region has a holder 12. A first part 13 of the holder 12 holds the first cladding element 3. A second part 15 of the holder 12 holds the second cladding element 5. Both the flow barrier 9 and the holder 12 engage in a cavity 17 into which the flow area 7 approximately the height of the center of the panel 1 and a cladding element 3, 5, expands. The cavity 17 is formed by a first groove 23 of the first cladding element 3 and by a second groove 25 of the second cladding element 5. The flow barrier 9 is formed by a high-temperature-resistant ceramic body 19 and a first variant of a spring element 21, wherein the first variant of the spring element 21 is formed in the form of a plate spring like spring-loaded.

The flow barrier 9 according to this first variant in the form of a metal seal with ceramic insert combines the temperature resistance of a ceramic with the spring properties of a metal. The resilient metal clip as spring plate-like design and pressure-loaded spring of the first variant of the spring element 21 is mounted between the outlet ends of the holder 12 in the region of the cavity 17 and the high temperature resistant ceramic body 19. The illustrated here first variant of the spring element 21 in the form of a metal clip presses the high temperature resistant ceramic body 19 firmly against the hot bar 33 of the first cladding element 3 and the hot bar 35 of the second cladding element 5. In addition, caused by the flow of cooling air pressure from the combustion chamber 11th During operation of the combustion chamber, the ceramic body 19 grinds on its top optimally on the bars 33, 35, so that the sealing effect of the flow barrier increases after a short period of operation and finally a complete sealing effect can be achieved.

Due to the spring action of the metal clip designed as a first variant of the spring element 21, the thermal expansion of the first 3 and second 5 cladding element is not hindered. The high-temperature-resistant ceramic body 19 protects the first variation of the spring element 21 formed as a metal clamp and the holder 12 from the side of the combustion chamber 11 before a hot gas intake through the flow region 7. When setting the flow area 7 larger tolerances can be allowed, since there are no more flow areas in the circumferential direction.

The FIGS. 2 to 4 Specifically, the assembly of the in the FIG. 1 shown first variant of the flow barrier 9. Referring to FIG. 1 First, a first cladding element 3 is mounted with a first part 13 of a holder 12 and a second part 15 of the holder 12. Thereafter, the first variant of a flow barrier 9 in the form of a composite seal of a first variant of a spring element 21 in the form of a metal clip on the one hand and with a high temperature resistant ceramic body 19 on the other hand into the cavity 17 forming groove 23 of the first cladding element 3 is inserted. Subsequently, the second cladding element 5 is pushed and mounted with its groove 17 forming the groove 25 via the holder 12 and the flow barrier 9.

In the FIG. 3 shown first variant of a spring element 21 has a trough 41, which forms the bearing surface between the first variant of the spring element 21 and the ceramic solid body 19. The in FIG. 2 shown solid ceramic body has a bulge 43, which comes to rest in the trough 41. The bearing surface formed between the spring element 21 and the solid ceramic body 19 is thus arched towards the spring element 21.

As a holding means, the in FIG. 3 shown spring element 21 at its axial ends along its elongated extension 45 each have a stop 47, which secures the position of the ceramic body 19 in a direction of elongated extent 45, ie in the axial direction.

The spring element 21 also has, along its middle part 49 of the elongated extension 45, the shape of a spring under pressure, which is designed in accordance with the principle of action of a disc spring. The spring 51 in the middle part 49 is at its sides 53 downwards, curved in an annular shape, the ends 55 facing slightly upwards, but are free. The spring 51 thus has the form of a metal clip. In this way, it works much like a diaphragm spring. In the side parts 57 beyond the middle part 49 of the first variant of the spring element 21 shown here, the spring element 21 is designed in the form of a mere support, which also continues the trough 41. The mere support has no spring action as the spring 51 in the middle part 49. The trough 41 protects and reinforces the high temperature resistant ceramic body 19 along the entire elongated extension 45 of the ceramic body 19, in particular against breakage, and presses it against the hot gas side 33, 35 a Cladding element 3, 5 of in FIG. 1 ,

FIG. 5 shows a second variant of a flow barrier 10 with a high temperature resistant ceramic body 20 and a second variant of a spring element 22. In the present case, the second variant of the spring element 22 along the entire elongated extension 46 in the form of a pressure-loaded resiliently yielding solid body is formed. The solid body is formed in the present embodiment of an Inconellgestrick or may in a further embodiment of this second variant of a similar material as the ceramic seal in the EP 1 302 723 A1 , namely in particular in the form of a ceramic seal with a Nextelhülle be formed. The shape of the second variant of the Spring element 22 is similar to the shape of the first variant of the spring element 21 made of metal, namely in cross-section similar to the shape of a lying eight.

In FIG. 6 is a perspective view of the second variant of the spring element 22 consisting of the solid ceramic body 20 and the pressure-loaded resiliently yielding solid body of the second variant of the spring element 22 shown. This second variant of the flow barrier 10 in turn rests on a holder 12 and is located in a cavity 17 of a flow region 7 between a first cladding element 3 and a second cladding element 5. The other elements of FIG. 6 correspond to those of FIG. 1 and are provided with the same reference numerals.

FIG. 7 shows a first cladding element 3 and a second cladding element 5 with the second variant of in FIG. 6 shown flow barrier 10 in a larger section of the panel 2 for a selected in this embodiment annular combustion chamber.

The second variant of the flow barrier 10 could in the present case optionally also by the in FIG. 1 shown first variant of the flow barrier 9 to be replaced.

FIG. 7 illustrates the effect of such a first variant of the flow barrier 9 or a second variant of a flow barrier 10 shown here in the combustion chamber. The flow barrier 9, 10 with high-temperature resistant ceramic body 19, 20 and spring element 21, 22 is virtually impermeable to air due to their above-described training after a short period of operation. In the FIG. 7 shown lining elements 3, 5 are attached to the combustion chamber 11 facing inside of a housing part 4 by means of one or more brackets for fastening the cladding elements 3, 5. The brackets 12 have cooling air holes 14. By the complete sealing of the flow area 7 with respect to the Combustion chamber 11 has the concept presented here of a flow barrier 9, 10, a higher cooling air saving potential than that in the EP 1 302 723 A1 described porous ceramic seal. The flow barrier 9, 10 is in fact inserted into a flow region 7 in such a way that the flow region 7 is completely sealed by the flow barrier 9, 10, since it is impermeable to air. A running between the housing part 4 and the cover 3, 5 cooling air flow 6 does not get through the flow area 7 into the combustion chamber 11, but rather for the benefit of the combustion chamber, along an orientation 48 of the flow region for cooling the holder 12 deflected. The extent of the flow region 48 suitably agrees with the in FIGS. 2 to 5 shown elongated expansions 45, 46 of a flow barrier 9, 10 match.

In summary, a combustion chamber for insulating a bearing housing part against a combustion chamber 11 of the combustion chamber on a panel 1, which is formed from a number of cladding elements. The distance between a first 3 and a second 5 cladding element is formed by a gap which provides a flow region 7 between the first 3 and the second cladding element and in the combustion chamber side hot gas and in the opposite direction cooling air can penetrate, the flow region 7 due to temperature changes may have varying dimensions. In order to design a high-temperature-resistant flow barrier as simple as possible for a flow region 7 of this type, a flow barrier 9, 10 is disclosed herein which has a high-temperature resistant ceramic body 19, 20 and a spring element 21, 22. The proposed flow barrier 9, 10 has improved heat resistance, greater cooling-air saving potential and reduces thermally-induced stresses in a trim element 3, 5. The invention leads to a lining of a combustion chamber and a combustion chamber.

Claims (12)

1. Flow barrier (9, 10) for use in a flow region (7) between a first (3) and a second (5) cladding element of a cladding (1) of a combustion chamber, wherein the flow barrier (9, 10) has a high temperature-resistant ceramic body (19, 20) and a resilient element (21, 22) and
   the high temperature-resistant ceramic body (19, 20) and the resilient element (21, 22) have a longitudinal extent (45), wherein the ceramic body (19, 20) bears on the resilient element (21, 22) along a bearing surface, and the bearing surface is oriented along the longitudinal extent (45).
2. Flow barrier (9, 10) according to Claim 1,
   characterized in that
   the flow barrier (9, 10) can be fastened between the first (3) and the second (5) cladding element such that the flow barrier (9, 10) engages in an opening of the flow region (7), wherein the opening of the flow region is formed by a first groove in the first cladding element and a second groove in the second cladding element.
3. Flow barrier (9, 10) according to Claim 1 or 2,
   characterized in that
   the bearing surface is curved towards the resilient element (21, 22).
4. Flow barrier (9, 10) according to one of Claims 1 to 3,
   characterized in that
   the resilient element (21, 22) has a retaining means (47) which secures the high temperature-resistant ceramic body (19, 20) in position along the longitudinal extent (45).
5. Flow barrier (9) according to one of Claims 1 to 4,
   characterized in that
   the resilient element (21) is formed, at least along a portion of the longitudinal extent (45), in the form of a spring loaded in compression in the manner of a Belleville washer.
6. Flow barrier (9) according to Claim 5,
   characterized in that
   the resilient element (21) is formed, along a further portion of the longitudinal extent (45), in the form of a simple support.
7. Flow barrier (10) according to one of Claims 1 to 4,
   characterized in that
   the resilient element (22) is formed, at least along a portion of the longitudinal extent (45), in the form of a solid body which is loaded in compression and which yields in a resilient manner.
8. Cladding (1) for a combustion chamber having a number of cladding elements, wherein a flow region (7) is formed between a first (3) and a second (5) cladding element, into which flow region a flow barrier (9, 10) according to one of Claims 1 to 7 is inserted.
9. Cladding (1) according to Claim 8,
   characterized in that
   one or more flow barriers (9, 10) are inserted into the flow region (7) such that the flow region (7) is completely sealed by the one or more flow barriers (9, 10).
10. Cladding (1) according to Claim 8 or 9,
    characterized in that
    one or more flow barriers (9, 10) are inserted into all the flow regions (7) running along a circumference of a cladding element (3, 5).
11. Combustion chamber having a cladding (1) which has a number of cladding elements (3, 5), wherein a flow region (7) is formed between a first (3) and a second (5) cladding element, into which flow region a flow barrier (9, 10) according to one of Claims 1 to 7 is inserted.
12. Combustion chamber according to Claim 11,
    characterized in that

    - a cladding element (3, 5) is attached, by means of a retainer (12), to that inner side of a casing part (4) which faces a combustion space (11), and

    - one or more flow barriers (9, 10) are inserted into the flow region (7) such that the flow region (7) is completely sealed by the one or more flow barriers (9, 10), and

    - a cooling air flow (6) running between the casing part (4) and the cladding (1) is deflected by one or more flow barriers (9, 10) along an extent (48) of the flow region (7) for the purpose of cooling the retainer (12).

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