EP3132201B1 - Side coated heat schild element with impacted cooling on open section - Google Patents

Side coated heat schild element with impacted cooling on open section Download PDF

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Publication number
EP3132201B1
EP3132201B1 EP15750951.4A EP15750951A EP3132201B1 EP 3132201 B1 EP3132201 B1 EP 3132201B1 EP 15750951 A EP15750951 A EP 15750951A EP 3132201 B1 EP3132201 B1 EP 3132201B1
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EP
European Patent Office
Prior art keywords
heat shield
cooling air
shield element
air openings
opposite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP15750951.4A
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German (de)
French (fr)
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EP3132201A1 (en
Inventor
Andreas Böttcher
Christopher Grandt
Andre Kluge
Tobias Krieger
Kai-Uwe Schildmacher
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Siemens AG
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Siemens AG
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/005—Combined with pressure or heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/007—Continuous combustion chambers using liquid or gaseous fuel constructed mainly of ceramic components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
    • F23R3/60—Support structures; Attaching or mounting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
    • F23R2900/00012—Details of sealing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
    • F23R2900/03042—Film cooled combustion chamber walls or domes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
    • F23R2900/03043—Convection cooled combustion chamber walls with means for guiding the cooling air flow

Definitions

  • the invention relates to a heat shield element, in particular for lining a combustion chamber wall, and a heat shield element consisting of heat shield elements.
  • the invention further relates to a method for producing a heat shield element.
  • the heat shield elements In order to protect the structure of a combustion chamber from high temperatures, it can be lined, for example, with ceramic bricks (Ceramic Heat Shields) and / or metallic bricks (Metallic Heat Shields).
  • the heat shield elements generally have a planar shape with a hot side facing the combustion chamber and an opposite cold side and peripheral edges, wherein a plurality of heat shield elements arranged next to one another form a heat shield. In this case, the heat shield elements are positioned at a distance from one another, so that in each case a side gap is formed between the edges of adjacent heat shield elements.
  • the object of the invention is therefore to provide a heat shield element and a heat shield assembly of the type mentioned above, which have a longer life, in particular an improved introduction of the cooling air in the side gap.
  • Another object of the invention is a method to specify for producing such a heat shield element.
  • the generic heat shield elements are usually used in a heat shield assembly for lining a combustion chamber of a gas turbine.
  • the heat shield elements have a hot side, which can be acted upon by a hot medium, and a cold side which is opposite to the hot side, and a peripheral edge which adjoins the hot side and the cold side. In the case of the generic heat shields, this extends from the hot side to beyond the plane of the cold side.
  • the edge raised on the cold side has an inner side and an outer side and in this case comprises a plurality of edge sections. In this case, it is not mandatory for each of the individual peripheral edge forming edge sections to project beyond the cold side starting from the hot side.
  • cooling air can thus be blown into the side gap between two heat shield elements through the cooling air openings.
  • an improved air flow into the side gap is achieved by the cooling air openings of an edge section offset from the cooling air openings of the opposite edge portion are arranged.
  • a heat shield member having a left edge portion in which the first cooling air hole at a distance X from the end of the edge portion, for example, from an upper edge portion, and the following cooling air openings each have the distance X
  • the opposite edge sections are provided on the outer sides with a thermal barrier coating. How the thermal barrier coating is carried out is irrelevant here at first.
  • At least the heat shield element in this exemplary embodiment initially consists of a carrier material, wherein at least the opposite, the cooling air openings having edge portions on the outer sides have a deviating, heat-insulating material. It can also be provided that the entire hot side and / or the entire peripheral edge are provided with the same or a similar thermal barrier coating.
  • the invention thus provides to carry out a heat shield element with at least coated side surfaces.
  • the thermal barrier coating insulates the underlying areas from the high combustion temperatures and ensures that the substrate temperature remains in a non-critical area.
  • the sole coating of the side surfaces of the heat shield elements reduces primarily the heat transfer and thus the heat input into the heat shield element, it does not protect against a hot gas inlet into the gap between two adjacent heat shield elements. For this reason, the known cooling air openings are maintained in order to effectively block the gap against hot gas intake. However, this leads to the problem that it may lead to cracks or flaking of this coating in this area due to the exiting from the cooling air openings cooling jet on a thermal barrier coating.
  • open spaces are areas that are not coated, but rather the open spaces are formed directly from the substrate.
  • the open spaces are to be arranged in alternation with the cooling air openings at the opposite edge portions.
  • the first embodiment according to the invention is combined with the second embodiment according to the invention in a particularly advantageous embodiment.
  • the heat shield element particularly advantageous at the two opposite edge portions in alternation cooling air openings and open spaces, wherein further the positions of the cooling air openings and open spaces are exchanged to each other from the one of the opposite edge portions to the other of the opposite edge portion.
  • the free surfaces are positioned so that impact cooling jets from adjacent heat shield elements impinge exactly on these free surfaces. A flaking off of the coating by an impingement cooling jet is thus avoided. Thus, an effective locking of the gap and an effective cooling of the side walls of the heat shield elements are ensured.
  • the support material has elevations in the size and the position of the desired free surfaces before applying the thermal insulation layer on the edge portions. These can be adapted in height to the subsequently applied thermal barrier coating, so that the advantageous heat shield element with a flat on the outer sides of the opposite edge portions surface of thermal insulation layer and open spaces.
  • a first heat shield arrangement according to the invention is formed in their adjacent arrangement.
  • the cooling air bores of an edge section of a heat shield element of an open space of the edge section of the following heat shield element adjacent to the side gap lie opposite one another at the side gap. In this arrangement, it is ensured that the particular advantages of the heat shield elements according to the invention come into play.
  • a second heat shield assembly allows the positioning of the cooling air holes in an edge portion at the side gap offset to the cooling air holes in an adjacent edge portion of the following heat shield element.
  • a heat shield arrangement is not provided here, that the respective heat shield element having different opposite edge portions.
  • first and second heat shield elements are used for this purpose, in which the position of the cooling air holes in the opposite edge sections differs such that, in the case of an alternating arrangement of the first heat shield element and the second heat shield element, an offset sequence of the cooling air openings again occurs the two adjacent edge portions of successive heat shield elements (here first and second heat shield element in alternation) allows an offset cooling air flow.
  • the generic shape of the first and second mutually different heat shield element in this case again corresponds to the above-mentioned generic shape of the first and the second embodiment of the invention heat shield elements.
  • both the first heat shield element and the second heat shield element alternately have cooling air openings and open spaces at the opposite side edges, the positions of which are the same when viewing the individual heat shield elements at the opposite edge sections, but differ from the first heat shield element to the second heat shield element, i. H. the position of cooling air opening and free space is reversed.
  • elevations are provided in at least one edge portion on the outside during the production of the carrier element formed from the carrier material during the casting of the heat shield element.
  • Their height is in this case advantageously dimensioned such that, after a coating applied after at least the outer side of the opposite edge sections on the outside, after coating a flat surface formed from the applied thermal barrier coating and the free surfaces formed by the surveys.
  • the side-coated heat shield element according to the invention with impingement cooling on open spaces combines several aspects and thus leads to an improved design.
  • the heat transfer and thus the heat input into the heat shield element is reduced by the side coating.
  • cooling air openings ensure a blockage of the gap between two heat shield elements. The introduction of open spaces at the points where the cooling air jet impinges, provides for cooling of the support structure of the heat shield element and at the same time for a robust design without the risk of chipping the heat protection layer or cracks at these locations.
  • the heat shield elements according to the invention and the heat shield assemblies according to the invention enable a technically simple feasible, since uncomplicated, and cost-effective solution to avoid corner overheating before and has no negative impact on the cooling air balance, ie There is no additional cooling air due to the invention.
  • the side coating in combination with open space for impingement cooling provides improved cooling and a robust design against chipping or cracks in the thermal barrier coating.
  • the modified design is service-friendly, so that the geometry of the heat shield elements can remain unchanged.
  • the FIG. 1 shows schematically and by way of example a first embodiment of a heat shield element 1 according to the invention.
  • the heat shield element 1 is essentially metallic, ie it comprises a metallic base body. It has a hot side 2 which can be acted upon by a hot medium and a cold side 3 which lies opposite the hot side 2. Adjacent to the hot side 2 and the cold side 3 is an encircling edge 4 which extends beyond the plane of the cold side 3 and has an inner 5 and an outer side 6 and a plurality of edge sections 7a, 7b, 7c and 7d.
  • cooling air openings 8a in the edge portion 7a and cooling air openings 8c in the edge portion 7c are arranged, each extending from the inner 5 to the outer side 6.
  • the arrangement of the cooling air openings 8a, 8c is selected so that cooling air openings 8a of a Edge portion 7a offset to cooling air openings 8c of an opposite edge portion 7c are arranged.
  • the outer sides 6 of at least two opposite edge sections 7a and 7c have a thermal barrier coating 9. This thermal barrier coating 9 is interrupted at least there and forms open spaces 10a, where in the opposite edge portion 7a, 7c, the cooling air openings 8a, 8c are arranged.
  • FIG. 2 shows a section of a first heat shield assembly 11 and with respect to the section corresponding to a second heat shield assembly 21 and there in particular the gap 13 between two heat shield elements 1 and 22 and 23, which are arranged side by side, that cooling air openings 8a and 26 of a heat shield element 1 and 22nd Open spaces 10c and 28 of an adjacent heat shield element 1 and 23 are opposite, which is achieved in that at the gap 13, the cooling air openings 8a, 8c and 26, 27 of the two adjacent heat shield elements 1 and 22, 23 offset from each other.
  • FIG. 3 shows a section of a heat shield element 1 after casting and before the coating of the outside 6 with a thermal barrier coating 9.
  • the outside 6 elevations 12 can be seen, the surfaces of which are the later free surfaces 10.
  • the height of the elevations 12 is ideally equal to the still applied to the surrounding surfaces thermal barrier coating 9, so that on the outside 6 after the coating, ie after the application of the thermal barrier coating 9, a flat surface is formed as in FIG. 4 is shown.
  • This shape also applies to the first and second heat shield elements 22, 23 of the alternative heat shield assembly 21.
  • FIG. 3 a second heat shield element 23 is sketched, which up to the position of the cooling air holes 27 and open spaces 29 coincident with the heat shield element 1 of the first heat shield assembly and the first heat shield element 22 lying for this embodiment, the second heat shield assembly 21 - see also Fig. 6 - is.
  • the first heat shield element 22 and also in the second heat shield element 23 shown here in contrast to the heat shield element 1 are made Fig. 1 the cooling air holes 25 and the open spaces 29 at the opposite edge portions 25 at the same place.
  • the invention provided for offset arrangement of the cooling air openings 24, 25, as in Fig. 2 sketched, is achieved in this second heat shield assembly 21 rather by different embodiments of the first heat shield element 22 and second heat shield element 23 with mutually exchanged position of cooling air holes 26, 27 and open spaces 28, 29 with alternating use of the first heat shield element 22 and the second heat shield element 23.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Description

Die Erfindung betrifft ein Hitzeschildelement, insbesondere zur Auskleidung einer Brennkammerwand, sowie eine aus Hitzeschildelementen bestehende Hitzeschildanordnung. Die Erfindung betrifft ferner ein Verfahren zum Herstellen eines Hitzeschildelements.The invention relates to a heat shield element, in particular for lining a combustion chamber wall, and a heat shield element consisting of heat shield elements. The invention further relates to a method for producing a heat shield element.

Um die Struktur einer Brennkammer vor hohen Temperaturen zu schützen, kann diese beispielsweise mit keramischen Steinen (Ceramic Heat Shields) und/oder metallischen Steinen (Metallic Heat Shields) ausgekleidet werden. Die Hitzeschildelemente weisen in aller Regel eine flächige Gestalt mit einer zur Brennkammer weisenden Heißseite und einer gegenüberliegenden Kaltseite und umlaufenden Rändern auf, wobei eine Mehrzahl nebeneinander angeordneter Hitzeschildelemente einen Hitzeschild bilden. Hierbei sind die Hitzeschildelemente beabstandet zueinander positioniert, so dass sich jeweils ein Seitenspalt zwischen den Rändern benachbarter Hitzeschildelemente bildet.In order to protect the structure of a combustion chamber from high temperatures, it can be lined, for example, with ceramic bricks (Ceramic Heat Shields) and / or metallic bricks (Metallic Heat Shields). The heat shield elements generally have a planar shape with a hot side facing the combustion chamber and an opposite cold side and peripheral edges, wherein a plurality of heat shield elements arranged next to one another form a heat shield. In this case, the heat shield elements are positioned at a distance from one another, so that in each case a side gap is formed between the edges of adjacent heat shield elements.

Sehr hohe thermische Belastungen während des Betriebes der Gasturbine, insbesondere lokale Temperaturspitzen, führen bei unzureichender Kühlung der Bauteile zu vorzeitigem Verschleiß beispielsweise einem Abplatzen einer Beschichtung. Höhere Gasturbinen-Ausbaustufen, die bei immer höheren Temperaturen arbeiten, verstärken diesen Effekt, so dass auch die Verschleißmechanismen weiter verstärkt werden. Eine Maßnahme, die Lebensdauer der Hitzeschilde zu verlängern, ist der Einsatz von Kühlluft. Diese wird insbesondere zur Verhinderung des Eindringens von heißen Verbrennungsgasen in den Seitenspalt eingeleitet. Jedoch ist die Kühlluftversorgung nicht immer optimal. In einigen Bereichen ist die Kühlung nicht ausreichend, in anderen Bereichen wird Kühlluft verschwendet, was auch vermieden werden sollte. Insbesondere die Seitenspalte zwischen zwei benachbarten Hitzeschildelementen sind häufig schlecht gekühlt bzw. schlecht gegen Eindringen von Heißgas gesperrt.
Hierzu ist aus der WO 2004/106809 A1 eine Ausführungsform einer Brennkammer mit Hitzschildelementen bekannt, welche rückseitig mit einer Kühlluft beaufschlagt sind, wobei die Hitzeschildelemente - wie üblich - beabstandet zueinander angeordnet sind. Zur Reduzierung der Belastung bei den eingesetzten metallischen Hitzeschildelementen ist eine keramische Beschichtung auf den eigentlichen Hitzeschildelementen vorgesehen.
Zur Verbesserung der Kühlung im Seitenspalt ohne übermäßigen Kühlluftverbrauch wird in der Ausführung aus der DE 10 2010 204 103 A1 bei Verwendung von metallischen Hitzeschildelementen eine Ausführungsform gewählt, bei der die Seitenränder rückseitig bis über die Kaltseite verlängert sind und hierbei in gegenüberliegenden Seitenrändern eine Reihe von Kühlluftbohrungen eingebracht werden. Die Zufuhr von Kühlluft erfolgt auf die Kaltseite des Hitzeschildelements, wobei diese anteilig durch die Kühlluftbohrungen in den Seitenspalt austritt und hierdurch den Eintritt von Heißgas verhindern kann.
Als nachteilig bei dieser Ausführung hat sich jedoch herausgestellt, dass bei der nebeneinander liegenden Anordnung der Hitzeschildelemente die Kühlluft austretend durch eine Kühlluftbohrung eines Hitzeschildelements entgegengesetzt auf die Kühlluft austretend durch eine Kühlluftbohrung eines benachbarten Hitzeschildelements triff. Dieses beeinträchtigt die gleichmäßige Verteilung der Kühlluft über die Länge des Seitenspalts.Very high thermal loads during operation of the gas turbine, in particular local temperature peaks, result in insufficient cooling of the components to premature wear, for example, a spalling of a coating. Higher gas turbine stages, which work at higher and higher temperatures, increase this effect, so that the wear mechanisms are further enhanced. One measure to extend the life of the heat shields is the use of cooling air. This is in particular introduced to prevent the penetration of hot combustion gases into the side gap. However, the cooling air supply is not always optimal. In some areas cooling is not sufficient, in other areas cooling air is wasted, which should also be avoided. In particular, the page column between two adjacent heat shield elements are often poorly cooled or badly blocked against ingress of hot gas.
This is from the WO 2004/106809 A1 an embodiment of a combustion chamber with Hitzschildelementen known, which are acted upon on the back with a cooling air, wherein the heat shield elements - as usual - are spaced from each other. To reduce the load on the metallic heat shield elements used, a ceramic coating is provided on the actual heat shield elements.
To improve the cooling in the side gap without excessive cooling air consumption is in the execution of the DE 10 2010 204 103 A1 when using metallic heat shield elements, an embodiment chosen in which the side edges are extended back to the cold side and in this case a number of cooling air holes are introduced in opposite side edges. The supply of cooling air takes place on the cold side of the heat shield element, which proportionally exits through the cooling air holes in the side gap and thereby can prevent the entry of hot gas.
A disadvantage of this embodiment has been found, however, that in the juxtaposition of the heat shield elements, the cooling air exiting through a cooling air hole of a heat shield element opposite to the cooling air exiting through a cooling air hole of an adjacent heat shield element. This affects the uniform distribution of the cooling air over the length of the side gap.

Das Dokument WO 2013135702 offenbart ein Hitzenschildelement gemäß den Oberbegriff des Anspruchs 1.The document WO 2013135702 discloses a heat shield element according to the preamble of claim 1.

Aufgabe der Erfindung ist es daher, ein Hitzeschildelement und eine Hitzeschildanordnung der oben genannten Art bereitzustellen, welche eine größere Lebensdauer, insbesondere eine verbesserte Einleitung der Kühlluft in den Seitenspalt aufweisen. Eine weitere Aufgabe der Erfindung ist es, ein Verfahren zum Herstellen eines solchen Hitzeschildelements anzugeben.The object of the invention is therefore to provide a heat shield element and a heat shield assembly of the type mentioned above, which have a longer life, in particular an improved introduction of the cooling air in the side gap. Another object of the invention is a method to specify for producing such a heat shield element.

Die Aufgabe wird in analoger Weise durch erfindungsgemäße Hitzeschildelemente nach der Lehre der Ansprüche 1 und 3 gelöst. Hierzu sind in den Ansprüchen 6 und 7 erfindungsgemäße Hitzeschildanordnungen angegeben, wobei der Anspruch 9 ein erfindungsgemäßes Verfahren zur Herstellung der erfindungsgemäßen Hitzeschildelemente betrifft.The object is achieved in an analogous manner by heat shield elements according to the invention according to the teaching of claims 1 and 3. For this purpose, claims 6 and 7 according to the invention are indicated in the heat shield assemblies, wherein the claim 9 relates to an inventive method for producing the heat shield elements of the invention.

Vorteilhafte Ausführungen der erfindungsgemäßen Hitzeschildelemente sowie der Hitzeschildanordnungen sind in den Unteransprüchen angegeben.Advantageous embodiments of the heat shield elements according to the invention and of the heat shield arrangements are specified in the subclaims.

Die gattungsgemäßen Hitzeschildelemente werden in der Regel in einer Hitzeschildanordnung zur Auskleidung einer Brennkammer einer Gasturbine eingesetzt. Hierbei weisen die Hitzeschildelemente eine mit einem heißen Medium beaufschlagbare Heißseite und eine der Heißseite gegenüberliegende Kaltseite und einen an die Heißseite und die Kaltseite angrenzenden, umlaufenden Rand auf. Dieser erstreckt sich bei den gattungsgemäßen Hitzeschildern ausgehend von der Heißseite bis über die Ebene der Kaltseite hinaus. Hierbei weist der auf der Kaltseite erhabene Rand eine Innenseite und eine Außenseite auf und umfasst hierbei mehrere Randabschnitte. Hierbei ist es nicht zwingend, dass jede der einzelnen, den umlaufenden Rand bildenden, Randabschnitte ausgehend von der Heißseite die Kaltseite überragen. Erforderlich ist es jedoch, dass zumindest zwei gegenüberliegende Randabschnitte sich bis über die Kaltseite erstrecken und hierbei sich von der Innenseite zur Außenseite erstreckende Kühlluftöffnungen aufweisen. Analog dem bekannten Stand der Technik kann somit durch die Kühlluftöffnungen Kühlluft in den Seitenspalt zwischen zwei Hitzeschildelemente eingeblasen werden.The generic heat shield elements are usually used in a heat shield assembly for lining a combustion chamber of a gas turbine. In this case, the heat shield elements have a hot side, which can be acted upon by a hot medium, and a cold side which is opposite to the hot side, and a peripheral edge which adjoins the hot side and the cold side. In the case of the generic heat shields, this extends from the hot side to beyond the plane of the cold side. In this case, the edge raised on the cold side has an inner side and an outer side and in this case comprises a plurality of edge sections. In this case, it is not mandatory for each of the individual peripheral edge forming edge sections to project beyond the cold side starting from the hot side. However, it is necessary for at least two opposite edge sections to extend over the cold side and in this case have cooling air openings extending from the inside to the outside. Analogously to the known state of the art, cooling air can thus be blown into the side gap between two heat shield elements through the cooling air openings.

In einer ersten erfindungsgemäßen Ausführungsform der Hitzeschildelemente wird eine verbesserte Luftströmung in den Seitenspalt erzielt, indem die Kühlluftöffnungen eines Randabschnitts versetzt zu den Kühlluftöffnungen des gegenüberliegenden Randabschnitts angeordnet sind. Betrachtet man beispielhaft ein Hitzeschildelement mit einem linken Randabschnitt, in dem die erste Kühlluftbohrung in einem Abstand X vom Ende des Randabschnitts, beispielsweise von einem oberen Randabschnitt aus, und die folgenden Kühlluftöffnungen jeweils zueinander den Abstand X aufweisen, so wäre es in der ersten erfindungsgemäßen Ausführungsform erforderlich, die erste Kühlluftbohrung des rechten gegenüberliegenden Randabschnitts in einem Abstand von circa 0,5 x X oder im einem Abstand von circa 1,5 x X vom Ende des Randabschnitts, dem Beispiel folgend vom oberen Randabschnitt aus, anzuordnen, wobei die folgenden Kühlluftöffnungen ebenso in einem Abstand von circa X zueinander anzuordnen wären.In a first embodiment according to the invention of the heat shield elements, an improved air flow into the side gap is achieved by the cooling air openings of an edge section offset from the cooling air openings of the opposite edge portion are arranged. Considering, by way of example, a heat shield member having a left edge portion in which the first cooling air hole at a distance X from the end of the edge portion, for example, from an upper edge portion, and the following cooling air openings each have the distance X, it would be in the first embodiment of the invention it is necessary to arrange the first cooling air hole of the right opposite edge portion at a pitch of about 0.5 x X or at a pitch of about 1.5 x X from the end of the edge portion following the example from the top edge portion, with the following cooling air holes as well to be arranged at a distance of about X to each other.

Durch die versetzte Anordnung der Kühlluftöffnungen an den gegenüberliegenden Randabschnitten wird bei Anordnung der gleichen Hitzeschildelemente nebeneinander ein unmittelbar entgegengesetztes Ausblasen von Kühlluft in den zwischen liegenden Seitenspalt vermieden.Due to the staggered arrangement of the cooling air openings at the opposite edge sections, an immediately opposite blowing out of cooling air into the intermediate side gap is avoided when the same heat shield elements are arranged side by side.

In einer zweiten erfindungsgemäßen Ausführungsform eines Hitzeschildelements werden die gegenüberliegenden Randabschnitte auf den Außenseiten mit einer Wärmedämmschicht versehen. Wie die Wärmedämmschicht ausgeführt wird ist hierbei zunächst unerheblich. Zumindest besteht das Hitzeschildelement in diesem Ausführungsbeispiel zunächst einmal aus einem Trägermaterial, wobei zumindest die gegenüberliegenden, die Kühlluftöffnungen aufweisenden Randabschnitte auf den Außenseiten ein abweichendes, wärmedämmendes Material aufweisen. Hierbei kann ebenso vorgesehen sein, dass die gesamte Heißseite und/oder der gesamte umlaufende Rand mit derselben oder einer ähnlichen Wärmedämmschicht versehen sind.In a second embodiment of a heat shield element according to the invention, the opposite edge sections are provided on the outer sides with a thermal barrier coating. How the thermal barrier coating is carried out is irrelevant here at first. At least the heat shield element in this exemplary embodiment initially consists of a carrier material, wherein at least the opposite, the cooling air openings having edge portions on the outer sides have a deviating, heat-insulating material. It can also be provided that the entire hot side and / or the entire peripheral edge are provided with the same or a similar thermal barrier coating.

Die Erfindung sieht also vor, ein Hitzeschildelement mit zumindest beschichteten Seitenflächen auszuführen. Die Wärmedämmschicht isoliert die darunterliegenden Bereiche vor den hohen Verbrennungstemperaturen und sorgt dafür, dass die Trägermaterialtemperatur in einem unkritischen Bereich bleibt. Das alleinige Beschichten der Seitenflächen der Hitzeschildelemente reduziert zwar in erster Linie den Wärmeübergang und damit den Wärmeeintrag in das Hitzeschildelement, es schützt allerdings nicht vor einem Heißgaseinzug in den Spalt zwischen zwei nebeneinander angeordneten Hitzeschildelementen. Aus diesem Grund werden die bekannten Kühlluftöffnungen beibehalten, um den Spalt effektiv gegen Heißgaseinzug zu sperren. Dies führt jedoch zu der Problematik, dass es aufgrund des aus den Kühlluftöffnungen austretenden Kühlstrahls auf eine Wärmedämmschicht zu Rissen oder Abplatzungen dieser Beschichtung in diesem Bereich führen kann. Um dies wirkungsvoll zu verhindern, werden nun in der zweiten erfindungsgemäßen Ausführung Freiflächen auf der Seitenwand des Hitzeschildelements vorgesehen. Diese Freiflächen sind Bereiche, die nicht beschichtet sind, sondern vielmehr werden die Freiflächen unmittelbar vom Trägermaterial gebildet. Hierbei sind die Freiflächen im Wechsel mit den Kühlluftöffnungen an den gegenüberliegenden Randabschnitten anzuordnen.The invention thus provides to carry out a heat shield element with at least coated side surfaces. The thermal barrier coating insulates the underlying areas from the high combustion temperatures and ensures that the substrate temperature remains in a non-critical area. Although the sole coating of the side surfaces of the heat shield elements reduces primarily the heat transfer and thus the heat input into the heat shield element, it does not protect against a hot gas inlet into the gap between two adjacent heat shield elements. For this reason, the known cooling air openings are maintained in order to effectively block the gap against hot gas intake. However, this leads to the problem that it may lead to cracks or flaking of this coating in this area due to the exiting from the cooling air openings cooling jet on a thermal barrier coating. In order to prevent this effectively, free surfaces are now provided on the side wall of the heat shield element in the second embodiment according to the invention. These open spaces are areas that are not coated, but rather the open spaces are formed directly from the substrate. Here, the open spaces are to be arranged in alternation with the cooling air openings at the opposite edge portions.

Um sowohl eine vorteilhafte Verteilung der Kühlluft im Seitenspalt zu erzielen als auch eine Schädigung der Hitzeschildelemente im Bereich der gegenüberliegenden Randabschnitte zu vermeiden wird in einer besonders vorteilhaften Ausführungsform die erste erfindungsgemäße Ausführungsform mit der zweiten erfindungsgemäßen Ausführungsform kombiniert.In order to achieve both an advantageous distribution of the cooling air in the side gap and to avoid damage to the heat shield elements in the region of the opposite edge portions, the first embodiment according to the invention is combined with the second embodiment according to the invention in a particularly advantageous embodiment.

Somit weist das besonders vorteilhaft Hitzeschildelement an den beiden gegenüberliegenden Randabschnitten im Wechsel Kühlluftöffnungen und Freiflächen auf, wobei weiterhin die Positionen der Kühlluftöffnungen und Freiflächen zueinander von dem einen der gegenüberliegenden Randabschnitte zu dem anderen der gegenüberliegenden Randabschnitt getauscht sind.Thus, the heat shield element particularly advantageous at the two opposite edge portions in alternation cooling air openings and open spaces, wherein further the positions of the cooling air openings and open spaces are exchanged to each other from the one of the opposite edge portions to the other of the opposite edge portion.

Hierbei ist es weiterhin besonders vorteilhaft, wenn die Freiflächen so positioniert sind, dass Prallkühlstrahlen aus benachbarten Hitzeschildelementen exakt auf diese Freiflächen auftreffen. Ein Abplatzen der Beschichtung durch einen Prallkühlstrahl wird somit vermieden. Somit sind ein wirkungsvolles Sperren des Spaltes und eine effektive Kühlung der Seitenwände der Hitzeschildelemente gewährleistet.In this case, it is furthermore particularly advantageous if the free surfaces are positioned so that impact cooling jets from adjacent heat shield elements impinge exactly on these free surfaces. A flaking off of the coating by an impingement cooling jet is thus avoided. Thus, an effective locking of the gap and an effective cooling of the side walls of the heat shield elements are ensured.

Bei der Realisierung der Freiflächen ist es weiterhin vorteilhaft, wenn das Trägermaterial vor dem Aufbringen der Wärmdämmschicht auf den Randabschnitten Erhebungen in der Größe und der Position der gewünschten Freiflächen aufweist. Hierbei können diese in der Höhe an die nachfolgend aufgebrachte Wärmedämmschicht angepasst werden, so dass sich das vorteilhafte Hitzeschildelement mit einer auf den Außenseiten der gegenüberliegenden Randabschnitte ebenen Fläche aus Wärmedämmschicht und Freiflächen darstellt.In the realization of the open spaces, it is also advantageous if the support material has elevations in the size and the position of the desired free surfaces before applying the thermal insulation layer on the edge portions. These can be adapted in height to the subsequently applied thermal barrier coating, so that the advantageous heat shield element with a flat on the outer sides of the opposite edge portions surface of thermal insulation layer and open spaces.

Grundsätzlich ist es unerheblich, aus welchem Trägermaterial das Hitzeschildelement hergestellt ist. Jedoch ist Verwendung der ersten oder der zweiten erfindungsgemäßen oder einer hierzu vorteilhaften Ausführungsform wiederum besonders vorteilhaft, wenn ein metallisches Trägermaterial gewählt wird.Basically, it does not matter from which carrier material the heat shield element is made. However, use of the first or the second embodiment according to the invention or an embodiment which is advantageous for this purpose is again particularly advantageous when a metallic carrier material is selected.

Bei Verwendung einer Mehrzahl von erfindungsgemäßen Hitzeschildelementen entsteht bei deren benachbarter Anordnung eine erste erfindungsgemäße Hitzeschildanordnung. Hierbei ist es besonders vorteilhaft, wenn am Seitenspalt die Kühlluftbohrungen eines Randabschnitts eines Hitzeschildelements einer Freifläche des am Seitenspalt benachbarten Randabschnitts des nachfolgenden Hitzeschildelements gegenüberliegen. In dieser Anordnung wird gewährleistet, dass die besonderen Vorteile der erfindungsgemäßen Hitzeschildelemente zum Tragen kommen.When using a plurality of heat shield elements according to the invention, a first heat shield arrangement according to the invention is formed in their adjacent arrangement. In this case, it is particularly advantageous if the cooling air bores of an edge section of a heat shield element of an open space of the edge section of the following heat shield element adjacent to the side gap lie opposite one another at the side gap. In this arrangement, it is ensured that the particular advantages of the heat shield elements according to the invention come into play.

Analog hierzu ermöglicht eine zweite erfindungsgemäße Hitzeschildanordnung die Positionierung der Kühlluftbohrungen in einem Randabschnitt am Seitenspalt versetzt zu den Kühlluftbohrungen in einem benachbarten Randabschnitt des folgenden Hitzeschildelements. Hierbei ist in Abweichung zur ersten erfindungsgemäßen Ausführungsform einer Hitzeschildanordnung jedoch nicht vorgesehen, dass das jeweilige Hitzeschildelement unterschiedliche gegenüberliegende Randabschnitte aufweist. Vielmehr werden hierzu zwei unterschiedliche Hitzeschildelemente, d.h. ein erstes Hitzeschildelement und ein zweites Hitzeschildelement, verwendet, bei denen sich die Position der Kühlluftbohrungen in den gegenüberliegenden Randabschnitten derart unterscheidet, dass bei einer abwechselnden Anordnung des ersten Hitzeschildelements und des zweiten Hitzeschildelements wiederum eine versetzte Abfolge der Kühlluftöffnungen der zwei benachbarten Randabschnitten aufeinander folgender Hitzeschildelemente (hier erstes und zweites Hitzeschildelement im Wechsel) eine versetzte Kühlluftströmung ermöglicht. Die gattungsgemäße Gestalt des ersten und des zweiten zueinander unterschiedlichen Hitzeschildelements entspricht hierbei wiederum der oben angeführten gattungsgemäßen Gestalt der ersten bzw. der zweiten Ausführungsform der erfindungsgemäßen Hitzeschildelemente.Similarly, a second heat shield assembly according to the invention allows the positioning of the cooling air holes in an edge portion at the side gap offset to the cooling air holes in an adjacent edge portion of the following heat shield element. In contrast to the first embodiment according to the invention, however, a heat shield arrangement is not provided here, that the respective heat shield element having different opposite edge portions. On the contrary, two different heat shield elements, ie a first heat shield element and a second heat shield element, are used for this purpose, in which the position of the cooling air holes in the opposite edge sections differs such that, in the case of an alternating arrangement of the first heat shield element and the second heat shield element, an offset sequence of the cooling air openings again occurs the two adjacent edge portions of successive heat shield elements (here first and second heat shield element in alternation) allows an offset cooling air flow. The generic shape of the first and second mutually different heat shield element in this case again corresponds to the above-mentioned generic shape of the first and the second embodiment of the invention heat shield elements.

Hierbei ist es besonders vorteilhaft, das erste und/oder das zweite Hitzeschildelement entsprechend der zweiten erfindungsgemäßen Ausführungsform des Hitzeschildelements ausgeführt sind. In diesem Fall weist sowohl das erste Hitzeschildelement als auch das zweite Hitzeschildelement an den gegenüberliegenden Seitenrändern abwechselnd Kühlluftöffnungen und Freiflächen auf, wobei dessen Positionen bei Betrachtung der einzelnen Hitzeschildelemente bei den gegenüberliegenden Randabschnitten gleich sind, sich jedoch vom ersten Hitzeschildelement zum zweiten Hitzeschildelement unterscheiden, d. h. die Position von Kühlluftöffnung und Freifläche vertauscht ist.In this case, it is particularly advantageous to design the first and / or the second heat shield element according to the second embodiment of the heat shield element according to the invention. In this case, both the first heat shield element and the second heat shield element alternately have cooling air openings and open spaces at the opposite side edges, the positions of which are the same when viewing the individual heat shield elements at the opposite edge sections, but differ from the first heat shield element to the second heat shield element, i. H. the position of cooling air opening and free space is reversed.

Die vorteilhaften Weiterbildungen der zweiten erfindungsgemäßen Ausführungsform eines Hitzeschildelements können ebenso vorteilhaft bei der zweiten erfindungsgemäßen Hitzeschildanordnung verwendet werden.The advantageous developments of the second embodiment according to the invention of a heat shield element can also be used to advantage in the second heat shield arrangement according to the invention.

Die Realisierung der erfindungsgemäßen Hitzeschildelemente sowie der erfindungsgemäßen Hitzeschildanordnungen erfordert ein neues Herstellungsverfahren. In Umkehr hierzu führt ein neu geschaffenes erfindungsgemäßes Verfahren zur Herstellung von Hitzeschildelementen zu der Schaffung von Hitzeschildelementen nach der zweiten erfindungsgemäßen Ausführungsform.The realization of the heat shield elements according to the invention and of the heat shield arrangements according to the invention requires a new production process. In reverse this introduces newly created method according to the invention for the production of heat shield elements for the creation of heat shield elements according to the second embodiment of the invention.

Insofern dient das gattungsgemäße Verfahren zum Herstellen eines Hitzeschildelements, welches die zuvor beschriebene gattungsgemäße Gestalt aufweist.In this respect, the generic method for producing a heat shield element, which has the generic shape described above.

Im Unterschied zu den Verfahren aus dem Stand der Technik zur Realisierung von Hitzeschildelementen nach dem Stand der Technik, werden beim Herstellen des aus dem Trägermaterial gebildeten Trägerelements beim Gießen des Hitzeschildelements an mindestens einem Randabschnitt auf der Außenseite Erhebungen vorgesehen. Deren Höhe ist hierbei vorteilhaft so zu bemessen, dass nach einer im Anschluss an zumindest den Außenseite der gegenüberliegenden Randabschnitte aufgebrachten Beschichtung an der Außenseite, nach der Beschichtung eine ebene Fläche gebildet aus der aufgebrachten Wärmedämmschicht und den von den Erhebungen gebildeten Freiflächen entsteht.In contrast to the methods of the prior art for the realization of heat shield elements according to the prior art, elevations are provided in at least one edge portion on the outside during the production of the carrier element formed from the carrier material during the casting of the heat shield element. Their height is in this case advantageously dimensioned such that, after a coating applied after at least the outer side of the opposite edge sections on the outside, after coating a flat surface formed from the applied thermal barrier coating and the free surfaces formed by the surveys.

Das seitenbeschichtete Hitzeschildelement nach der Erfindung mit Prallkühlung an Freiflächen kombiniert mehrere Aspekte und führt so zu einem verbesserten Design. Zum einen wird durch die Seitenbeschichtung der Wärmeübergang und damit der Wärmeeintrag in das Hitzeschildelement verringert. Zusätzlich sorgen Kühlluftöffnungen für eine Sperrung des Spaltes zwischen zwei Hitzeschildelementen. Die Einführung von Freiflächen an den Stellen an denen der Kühlluftstrahl auftrifft, sorgt für Kühlung der Tragstruktur des Hitzeschildelements und gleichzeitig für ein robustes Design ohne die Gefahr von Abplatzungen der Wärmeschutzschicht oder Rissen an diesen Stellen.The side-coated heat shield element according to the invention with impingement cooling on open spaces combines several aspects and thus leads to an improved design. On the one hand, the heat transfer and thus the heat input into the heat shield element is reduced by the side coating. In addition, cooling air openings ensure a blockage of the gap between two heat shield elements. The introduction of open spaces at the points where the cooling air jet impinges, provides for cooling of the support structure of the heat shield element and at the same time for a robust design without the risk of chipping the heat protection layer or cracks at these locations.

Die erfindungsgemäßen Hitzeschildelemente sowie die erfindungsgemäßen Hitzeschildanordnungen ermöglichen eine technisch einfach machbare, da unkomplizierte, und kostengünstige Lösung zur Vermeidung einer Eckenüberhitzung vor und weist keinen negativen Einfluss auf die Kühlluftbilanz auf, d. h. es entsteht durch die Erfindung kein Kühlluftmehrverbrauch. Die Seitenbeschichtung in Kombination mit Freiflächen für die Prallkühlung ermöglicht eine verbesserte Kühlung sowie ein robustes Design gegenüber Abplatzungen bzw. Rissen in der Wärmedämmschicht. Weiterhin ist das geänderte Design servicefreundlich, so dass die Geometrie der Hitzeschildelemente unverändert bleiben kann.The heat shield elements according to the invention and the heat shield assemblies according to the invention enable a technically simple feasible, since uncomplicated, and cost-effective solution to avoid corner overheating before and has no negative impact on the cooling air balance, ie There is no additional cooling air due to the invention. The side coating in combination with open space for impingement cooling provides improved cooling and a robust design against chipping or cracks in the thermal barrier coating. Furthermore, the modified design is service-friendly, so that the geometry of the heat shield elements can remain unchanged.

Die Erfindung wird beispielhaft anhand der Zeichnungen näher erläutert. Es zeigen schematisch und nicht maßstäblich:

Figur 1
ein Hitzeschildelement nach der ersten Ausführungsform der Erfindung,
Figur 2
den Spalt zwischen zwei Hitzeschildelementen einer Hitzeschildanordnung,
Figur 3
Freiflächen eines Hitzeschildelements als kleine Erhebungen vor der Beschichtung,
Figur 4
eine ebene Seitenfläche des Hitzeschildelements nach dem Beschichten,
Figur 5
ein zweites Hitzeschildelement analog der Ausführung aus Fig. 1 und
Figur 6
analog der Fig. 4 die Seitenfläche des zweiten Hitzeschildelements.
The invention will be explained in more detail by way of example with reference to the drawings. Shown schematically and not to scale:
FIG. 1
a heat shield element according to the first embodiment of the invention,
FIG. 2
the gap between two heat shield elements of a heat shield assembly,
FIG. 3
Open spaces of a heat shield element as small elevations before coating,
FIG. 4
a flat side surface of the heat shield element after coating,
FIG. 5
a second heat shield element analogous to the execution of Fig. 1 and
FIG. 6
analogous to Fig. 4 the side surface of the second heat shield element.

Die Figur 1 zeigt schematisch und beispielhaft ein erstes Ausführungsbeispiel für ein Hitzeschildelement 1 nach der Erfindung. Das Hitzeschildelement 1 ist im Wesentlichen metallisch, d. h. es umfasst einen metallischen Grundkörper. Es weist eine mit einem heißen Medium beaufschlagbare Heißseite 2 und eine der Heißseite 2 gegenüberliegende Kaltseite 3 auf. An die Heißseite 2 und die Kaltseite 3 grenzt ein umlaufender, sich über die Ebene der Kaltseite 3 hinaus erstreckender Rand 4 mit einer Innen- 5 und einer Außenseite 6 und mehreren Randabschnitten 7a, 7b, 7c und 7d. Im Rand 4 sind Kühlluftöffnungen 8a im Randabschnitt 7a und Kühlluftöffnungen 8c im Randabschnitt 7c angeordnet, die sich jeweils von der Innen-5 zur Außenseite 6 erstrecken. Die Anordnung der Kühlluftöffnungen 8a, 8c ist so gewählt, dass Kühlluftöffnungen 8a eines Randabschnitts 7a versetzt zu Kühlluftöffnungen 8c eines gegenüberliegenden Randabschnitts 7c angeordnet sind. Nach der Erfindung weisen die Außenseiten 6 zumindest zweier gegenüberliegender Randabschnitte 7a und 7c eine Wärmedämmschicht 9 auf. Diese Wärmedämmschicht 9 ist zumindest dort unterbrochen und bildet Freiflächen 10a, wo im gegenüberliegenden Randabschnitt 7a, 7c die Kühlluftöffnungen 8a, 8c angeordnet sind.The FIG. 1 shows schematically and by way of example a first embodiment of a heat shield element 1 according to the invention. The heat shield element 1 is essentially metallic, ie it comprises a metallic base body. It has a hot side 2 which can be acted upon by a hot medium and a cold side 3 which lies opposite the hot side 2. Adjacent to the hot side 2 and the cold side 3 is an encircling edge 4 which extends beyond the plane of the cold side 3 and has an inner 5 and an outer side 6 and a plurality of edge sections 7a, 7b, 7c and 7d. In the edge 4 cooling air openings 8a in the edge portion 7a and cooling air openings 8c in the edge portion 7c are arranged, each extending from the inner 5 to the outer side 6. The arrangement of the cooling air openings 8a, 8c is selected so that cooling air openings 8a of a Edge portion 7a offset to cooling air openings 8c of an opposite edge portion 7c are arranged. According to the invention, the outer sides 6 of at least two opposite edge sections 7a and 7c have a thermal barrier coating 9. This thermal barrier coating 9 is interrupted at least there and forms open spaces 10a, where in the opposite edge portion 7a, 7c, the cooling air openings 8a, 8c are arranged.

Figur 2 zeigt einen Ausschnitt einer ersten Hitzeschildanordnung 11 und bezüglich des Ausschnitts übereinstimmend einer zweiten Hitzeschildanordnung 21 und dort insbesondere den Spalt 13 zwischen zwei Hitzeschildelementen 1 bzw. 22 und 23, die so nebeneinander angeordnet sind, dass Kühlluftöffnungen 8a bzw. 26 eines Hitzeschildelements 1 bzw. 22 Freiflächen 10c bzw. 28 eines benachbarten Hitzeschildelements 1 bzw. 23 gegenüberliegen, was dadurch erreicht wird, dass am Spalt 13 die Kühlluftöffnungen 8a, 8c bzw. 26, 27 der beiden benachbarten Hitzeschildelemente 1 bzw. 22, 23 versetzt gegeneinander angeordnet sind. FIG. 2 shows a section of a first heat shield assembly 11 and with respect to the section corresponding to a second heat shield assembly 21 and there in particular the gap 13 between two heat shield elements 1 and 22 and 23, which are arranged side by side, that cooling air openings 8a and 26 of a heat shield element 1 and 22nd Open spaces 10c and 28 of an adjacent heat shield element 1 and 23 are opposite, which is achieved in that at the gap 13, the cooling air openings 8a, 8c and 26, 27 of the two adjacent heat shield elements 1 and 22, 23 offset from each other.

Figur 3 zeigt einen Ausschnitt eines Hitzeschildelementes 1 nach dem Gießen und vor der Beschichtung der Außenseite 6 mit einer Wärmedämmschicht 9. Am gezeigten Randabschnitt 7 sind auf der Außenseite 6 Erhebungen 12 zu erkennen, deren Oberflächen die späteren Freiflächen 10 sind. Die Höhe der Erhebungen 12 ist im Idealfall gleich der noch auf die umgebenden Flächen aufzubringenden Wärmedämmschicht 9, so dass an der Außenseite 6 nach der Beschichtung, also nach dem Aufbringen der Wärmedämmschicht 9, eine ebene Fläche entsteht, wie sie in Figur 4 gezeigt ist. Diese Gestalt gilt ebenso für die ersten und zweiten Hitzeschildelemente 22, 23 der alternativen Hitzeschildanordnung 21. FIG. 3 shows a section of a heat shield element 1 after casting and before the coating of the outside 6 with a thermal barrier coating 9. On the edge portion 7 shown are on the outside 6 elevations 12 can be seen, the surfaces of which are the later free surfaces 10. The height of the elevations 12 is ideally equal to the still applied to the surrounding surfaces thermal barrier coating 9, so that on the outside 6 after the coating, ie after the application of the thermal barrier coating 9, a flat surface is formed as in FIG. 4 is shown. This shape also applies to the first and second heat shield elements 22, 23 of the alternative heat shield assembly 21.

In der Figur 3 wird ein zweites Hitzeschildelement 23 skizziert, welches bis auf die Position der Kühlluftbohrungen 27 und Freiflächen 29 übereinstimmend mit dem Hitzeschildelement 1 der ersten Hitzeschildanordnung sowie dem ersten Hitzeschildelement 22 der für dieses Ausführungsbeispiel zu Grund liegenden zweiten Hitzeschildanordnung 21 - siehe hierzu auch Fig. 6 - ist. Bei dem ersten Hitzeschildelement 22 und ebenso bei dem hier dargestellten zweiten Hitzeschildelement 23 liegen im Gegensatz zu dem Hitzeschildelement 1 aus Fig. 1 die Kühlluftbohrungen 25 sowie die Freiflächen 29 bei den gegenüberliegenden Randabschnitten 25 an gleicher Stelle.In the FIG. 3 a second heat shield element 23 is sketched, which up to the position of the cooling air holes 27 and open spaces 29 coincident with the heat shield element 1 of the first heat shield assembly and the first heat shield element 22 lying for this embodiment, the second heat shield assembly 21 - see also Fig. 6 - is. In the first heat shield element 22 and also in the second heat shield element 23 shown here, in contrast to the heat shield element 1 are made Fig. 1 the cooling air holes 25 and the open spaces 29 at the opposite edge portions 25 at the same place.

Die der Erfindung nach vorgesehene versetzte Anordnung der Kühlluftöffnungen 24, 25, wie in Fig. 2 skizziert, wird in dieser zweiten Hitzeschildanordnung 21 vielmehr durch unterschiedliche Ausführungen vom ersten Hitzeschildelement 22 und zweiten Hitzeschildelement 23 mit zueinander vertauschter Position von Kühlluftbohrungen 26, 27 und Freiflächen 28, 29 bei wechselnder Verwendung vom ersten Hitzeschildelement 22 und dem zweiten Hitzeschildelement 23 erzielt.The invention provided for offset arrangement of the cooling air openings 24, 25, as in Fig. 2 sketched, is achieved in this second heat shield assembly 21 rather by different embodiments of the first heat shield element 22 and second heat shield element 23 with mutually exchanged position of cooling air holes 26, 27 and open spaces 28, 29 with alternating use of the first heat shield element 22 and the second heat shield element 23.

Claims (7)

  1. Heat shield element (1, 22, 23) for cladding a combustion chamber wall, having a hot side (2) that can be exposed to a hot medium, and having a cold side (3) opposite the hot side (2), and having a peripheral rim (4) adjoining the hot side (2) and the cold side (3) and extending beyond the plane of the cold side (3), which rim comprises an inner side (5) and an outer side (6) and multiple rim sections (7a, 7b, 7c, 7d, 24, 25), wherein in at least two opposite rim sections (7a, 7c, 24, 25) there are arranged cooling air openings (8a, 8c, 26, 27) extending from the inner side (5) to the outer side (6),
    characterized
    in that the heat shield element (1, 22, 23) has a substrate and at least the outer sides (6) of the opposite rim sections (7a, 7c, 24, 25) have a thermal barrier coating (9) which is interrupted in alternation with the cooling air openings (8a, 8c, 26, 27) and forms exposed surfaces (10a, 28, 29) .
  2. Heat shield element (1) according to Claim 1,
    characterized
    in that the cooling air openings (8a) of one rim section (7a) are arranged offset with respect to the cooling air openings (8c) of the opposite rim section (7c).
  3. Heat shield element (1, 22, 23) according to Claim 1 or 2,
    characterized
    in that the substrate on the opposite rim sections (7a, 7c, 24, 25) has, on the outer side (6), raised portions (12) which form the exposed surfaces (10a, 28, 29) and are created in a planar surface with the surrounding thermal barrier coating (9).
  4. Heat shield element (1) according to one of Claims 1 to 3,
    characterized
    in that the substrate is metallic.
  5. Heat shield arrangement (11) having multiple heat shield elements (1, 22, 23) according to one of Claims 1 to 4,
    characterized
    in that the heat shield elements (1) are arranged next to one another such that cooling air openings (8a, 8c) of one heat shield element (1) are opposite exposed surfaces (10a, 28, 29) of an adjacent heat shield element (1).
  6. Heat shield arrangement according to Claim 5,
    characterized
    in that the cooling air openings (26) in the rim sections (24) of a first heat shield element (22) are arranged opposite one another and the cooling air openings (27) in the rim sections (25) of a second heat shield element (23) are arranged opposite one another, wherein the cooling air openings (26) of the first heat shield element (22) are arranged offset with respect to the cooling air openings (27) of the adjacent second heat shield element (23).
  7. Method for producing a heat shield element (1, 22, 23) having a hot side (2) that can be exposed to a hot medium, and having a cold side (3) opposite the hot side (2), and having a peripheral rim (4) adjoining the hot side (2) and the cold side (3) and extending beyond the plane of the cold side (3), having an inner side (5) and an outer side (6) and multiple rim sections (7a, 7b, 7c, 7d, 24, 25), and having multiple cooling air openings (8a, 8c, 26, 27) arranged in the rim (4) and extending from the inner side (5) to the outer side (6),
    characterized in that when casting the heat shield element (1, 22, 23) raised portions (12) are formed on the outer side (6) of at least one rim section (7a, 7c, 24, 25), the height of which is made to be equal to the thermal barrier coating (9) subsequently applied to the surrounding surfaces, such that after application of the thermal barrier coating (9) the outer side (6) has a flat surface.
EP15750951.4A 2014-07-30 2015-07-29 Side coated heat schild element with impacted cooling on open section Not-in-force EP3132201B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014214981.9A DE102014214981B3 (en) 2014-07-30 2014-07-30 Side-coated heat shield element with impingement cooling on open spaces
PCT/EP2015/067330 WO2016016280A1 (en) 2014-07-30 2015-07-29 Side-coated heat shield element with impingement cooling at exposed surfaces

Publications (2)

Publication Number Publication Date
EP3132201A1 EP3132201A1 (en) 2017-02-22
EP3132201B1 true EP3132201B1 (en) 2018-01-03

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EP15750951.4A Not-in-force EP3132201B1 (en) 2014-07-30 2015-07-29 Side coated heat schild element with impacted cooling on open section

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EP (1) EP3132201B1 (en)
CN (1) CN107003001A (en)
DE (1) DE102014214981B3 (en)
WO (1) WO2016016280A1 (en)

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Publication number Priority date Publication date Assignee Title
EP3252378A1 (en) 2016-05-31 2017-12-06 Siemens Aktiengesellschaft Gas turbine annular combustor arrangement
DE102016224632A1 (en) * 2016-12-09 2018-06-14 Rolls-Royce Deutschland Ltd & Co Kg Plate-shaped component of a gas turbine and method for its production
DE102017207487A1 (en) * 2017-05-04 2018-11-08 Siemens Aktiengesellschaft combustion chamber

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US6250082B1 (en) * 1999-12-03 2001-06-26 General Electric Company Combustor rear facing step hot side contour method and apparatus
GB0117110D0 (en) * 2001-07-13 2001-09-05 Siemens Ag Coolable segment for a turbomachinery and combustion turbine
US6749396B2 (en) * 2002-06-17 2004-06-15 General Electric Company Failsafe film cooled wall
EP1482246A1 (en) * 2003-05-30 2004-12-01 Siemens Aktiengesellschaft Combustion chamber
DE102005046731A1 (en) * 2005-04-19 2006-11-02 Siemens Ag Heat shield arrangement
US7278820B2 (en) * 2005-10-04 2007-10-09 Siemens Power Generation, Inc. Ring seal system with reduced cooling requirements
US7669422B2 (en) * 2006-07-26 2010-03-02 General Electric Company Combustor liner and method of fabricating same
US8118546B2 (en) * 2008-08-20 2012-02-21 Siemens Energy, Inc. Grid ceramic matrix composite structure for gas turbine shroud ring segment
US8499566B2 (en) * 2010-08-12 2013-08-06 General Electric Company Combustor liner cooling system
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CN103115381B (en) * 2011-11-17 2015-04-01 中航商用航空发动机有限责任公司 Cylinder wall structure of flame tube
DE102012204103A1 (en) * 2012-03-15 2013-09-19 Siemens Aktiengesellschaft Heat shield element for a compressor air bypass around the combustion chamber
CN202792104U (en) * 2012-09-10 2013-03-13 中航商用航空发动机有限责任公司 Flame tube wall plate, flame tube and combustion chamber of combustion gas turbine

Also Published As

Publication number Publication date
CN107003001A (en) 2017-08-01
EP3132201A1 (en) 2017-02-22
DE102014214981B3 (en) 2015-12-24
WO2016016280A1 (en) 2016-02-04

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