GB2457281A - A Combustor Wall Arrangement with Parts Joined by Mechanical Fasteners - Google Patents
A Combustor Wall Arrangement with Parts Joined by Mechanical Fasteners Download PDFInfo
- Publication number
- GB2457281A GB2457281A GB0802379A GB0802379A GB2457281A GB 2457281 A GB2457281 A GB 2457281A GB 0802379 A GB0802379 A GB 0802379A GB 0802379 A GB0802379 A GB 0802379A GB 2457281 A GB2457281 A GB 2457281A
- Authority
- GB
- United Kingdom
- Prior art keywords
- combustor
- wall
- ring shaped
- axial length
- apertures
- 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.)
- Granted
Links
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
- F23R3/002—Wall structures
-
- 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
- F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
- F23R3/04—Air inlet arrangements
- F23R3/06—Arrangement of apertures along the flame tube
- F23R3/08—Arrangement of apertures along the flame tube between annular flame tube sections, e.g. flame tubes with telescopic sections
-
- 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
- F23R2900/00017—Assembling combustion chamber liners or subparts
Abstract
A combustor 2 for a turbine engine has an outer wall 8 and an associated ring shaped support 40, 10. The wall and ring are secured together by several mechanical fasteners, which may take the form of tabs (30, 34 fig 3) and apertures 16, 18, (32 fig 3; 42, 44 fig 4). The combustor wall may be formed of a sheet metal material, such as a high temperature resistant alloy. The outer wall may be formed from several axial lengths arranged along the axis of the combustor, and each axial length may be stepped radially from another and separated from the neighbouring axial length by one of the ring shaped supports. The combustor may be annular in form, and includes an inner wall 6 arranged about the combustor axis and secured to a ring shaped support which defines a combustor head 10. The head may include fuel injector apertures 14 and an aperture 20 through which a linkage between an upstream compressor and a downstream turbine may pass. A sheet metal combustor with mechanical fastenings provides for a low-cost combustor, permitting an economic short-life single operation turbine engine.
Description
COMBUSTOR
This invention relates to combustors and in particular combustors for lower cost and possibly disposable turbine engines.
Combustors for turbine engines are typically made using cast heads welded to either rolled or expanded sheet walls. Alternative walls are constructed from forgings machined to provide the desired construction. Either way produces a high integrity component that is unfortunately too expensive to be sensible option for short-life, single operation turbine engines.
It is an object of the present invention to provide a cheaper combustor for a gas turbine engine.
According to a first aspect of the invention there is provided a combustor for a turbine engine, the combustor having an outer wall extending about a combustor axis and at least one ring shaped support, wherein one of the axial ends of the wall is secured to one of the ring shaped supports by a plurality of mechanical fasteners.
Preferably the wall is formed from a plurality of adjacent axial lengths of wall, each axial length being separated from a neighbouring axial length by one of the ring shaped supports.
Preferably the plurality of mechanical fasteners are tabs and apertures.
The wall or axial length of wall are preferably formed with tabs which engage apertures on the ring shaped supports.
The neighbouring axial lengths may be stepped radially from each other.
The corubustor may be annular and comprise an inner wall coaxial about the combustor axis but spaced radially from the outer wall to define an annular combustion volume, wherein one of the ring shaped supports provides a combustor head to which both the outer wall and the inner wall are secured by the mechanical fasteners.
The wall or an axial length thereof may be formed from a sheet of material with mechanical fastener means along its longitudinal edges which engage such that the sheet forms a tube.
Preferably wall or an axial length thereof is formed from a plurality of sheets of material each with mechanical fastening means along their longitudinal edges which engage mechanical fastening means of an adjacent sheet such that the sheets forms a tube.
The mechanical fastening means along the longitudinal edges may be tabs engaging apertures.
Embodiments of the invention will now be described by way of example only, with reference to the accompanying drawings, in which: Fig. 1 depicts a cross-section of a portion of an turbine combustor formed in accordance with the invention.
Fig. 2 depicts a combstor head formed in accordance with the invention.
Fig. 3 depicts a combustor wall formed in accordance with the invention.
Fig. 4 depicts an intermediate cooling ring in accordance with the invention.
Figure 1 depicts the top half of an annular combustor 2 manufactured in accordance with the invention with the combustor extending about an engine and combustor centre line 4. The annular combustor has a radially inner wall 6 and a radially outer wall 8, both of which extend about the axis 4. The combustion volume lies between the inner and outer walls.
The walls 6,8 are joined at their upstream end to a combustor head component 10 to which an upstream cowl 12 may be provided if required by the engine design. The combustor head 10 has apertures 14 through which a fuel injector head (not shown) can be inserted. The injector supplies a spray of fuel to the combustor volume that is ignited by an igniter (not shown).
The combustor head 10, as shown in Figure 2, is generally disc shaped and formed of a sheet material. The sheet material may be cut or punched to the desired shape using a mechanical tool. Preferably the sheet material is laser cut to provide both its exterior shape and cut to provide its internal apertures 14, 16, 18 and 20.
As mentioned above some of the internal apertures 14 are used to provide access to present the fuel injector to the combustion volume. Other apertures 16, 18 are used to attach the inner and outer walls of the combustor to the combustor head, as will be explained in more detail a bit later.
The final aperture permits passage of a shaft or the like mechanically linking an upstream compressor and a downstream turbine, the downstream turbine using the products of combustion to power the upstream compressor.
The combustor head is preferably formed of a high-temperature resistant alloy such as a nickel superalloy.
For cost reasons it may be desirable to form the head from a lower temperature resistant material which is provided with a thermal barrier coating to improve its temperature resistance.
The combustor walls are formed of a sheet material as depicted in Figure 3. The sheets have tabs 30 and recesses 32 that allow them to be joined to adjacent sheets thereby creating a wall that extends about the whole circumference of the combustor. Beneficially, this method permits relatively large combustors to be formed from multiple sheets. Where the combustor is smaller, or manufacturing capability permits, it is possible to use a single sheet bent around the circumference. The mechanical fasteners located on one edge of the sheet fitting into the complementary mechanical fastener on the opposing edge of the sheet. In a slightly alternative arrangement the sheets may be replaced by pipes with the correct diameter and cut to a desired length. Such pipes may be stock items e.g. of the petrochemical or other industries and are therefore relatively cheap.
Tabs 34 are located on the axially upper end of the sheet and these are positioned in locations corresponding to the apertures 16 or 18 depending on whether the sheet is to form the radially inner or outer wall of the combustor.
To attach the wall to the combustor head the sheet or sheets are bent and secured together to form a cylinder.
The tabs are inserted through their corresponding apertures and bent or twisted to secure the cylinder to the head.
Where a pipe is used to form the wall rather than a sheet the pipe is formed with a series of tabs or cut to form a series of tabs which are used to secure the pipe to the combustor head in the same way that the cylinder is secured.
In many combustor arrangements it is desirable to provide outward steps at regular intervals along its length. The modular approach of manufacturing the combustor makes this extremely simple. The combustor is provided with supporting rings 40 formed, like the combustor head, of shaped sheet metal.
The support ring has a circumferentially extending array of apertures 44 for receiving tabs located on a sheet forming the portion of the combustor wall that is located upstream of the support ring 40. A second circumferentially extending array of apertures 42 are located on the support ring in a position which receives corresponding tabs on a sheet forming the portion of the combustor wall that is located downstream of the support ring 40. As the support ring enables a radially outward step in the combustor wall the second array of apertures is radially outside the first array.
An array of holes 46 permit a volume of air 48 to be supplied to the interior of the combustor for cooling or dilution purposes.
It will be appreciated that for an axial combustor two support rings 40, 41 are required for each radial step. The first support ring 40 is provided to the radially outer wall of the combustor, whilst the second support ring 41 is provided to the radially inner wall of the combustor. For turbo-annular or cylindrical combustion chambers it will be appreciated that it is possible to provide a single support ring per outward step.
Once the tabs of the wall 8 have been inserted through the appropriate apertures 16, 18 on the combustor head or the support ring 42, 44 it is possible to twist or bend the tab to secure the wall to the head or support ring. Any appropriate tab shape could be used. Appropriate tabs are known from EP1097309 and EP1259339. The teachings of both these patents are incorporated herein by reference.
Beneficially, the invention permits a robust combustor to be manufactured simply and cheaply from a number of cheaply and easily formed components. By securing of the components together using mechanical fasteners rather than welding the expensive welding operations are removed and inspection of the finished combustor for defects is simplified.
Claims (10)
- CLAIMS1. A combustor for a turbine engine, the combustor having an outer wall extending about a combustor axis and at least one ring shaped support, wherein one of the axial ends of the wall is secured to one of the ring shaped supports by a plurality of mechanical fasteners.
- 2. A combustor according to claim 1, wherein the wall is formed from a plurality of adjacent axial lengths of wall, each axial length being separated from a neighbouring axial length by one of the ring shaped supports.
- 3. A combustor according to claim 1 or claim 2, wherein the plurality of mechanical fasteners are tabs and apertures.
- 4. A combustor according to claim 3, wherein the wall or axial length of wall is formed with tabs which engage apertures on the ring shaped supports.
- 5. A combustor according to claim 2, wherein the neighbouring axial lengths are stepped radially from each other.
- 6. A combustor according to any preceding claim, wherein the combustor is annular and comprises an inner wall coaxial about the combustor axis but spaced radially from the outer wall to define an annular combustion volume, wherein one of the ring shaped supports provides a combustor head to which both the outer wall and the inner wall are secured by the mechanical fasteners.
- 7. A combustor according to any of claim 1 to claim 6, wherein the wall or an axial length thereof is formed from a sheet of material with mechanical fastener means along its longitudinal edges which engage such that the sheet forms a tube.
- 8. A combustor according to any of claim 1 to claim 6, wherein the wall or an axial length thereof is formed from a plurality of sheets of material each with mechanical fastening means along their longitudinal edges which engage mechanical fastening means of an adjacent sheet such that the sheets forms a tube.
- 9. A combustor according to claim 7 or claim 8, wherein the mechanical fastening means along the longitudinal edges are tabs engaging apertures.
- 10. A combustor substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0802379A GB2457281B (en) | 2008-02-11 | 2008-02-11 | A Combustor Wall Arrangement with Parts Joined by Mechanical Fasteners |
US12/365,181 US8408010B2 (en) | 2008-02-11 | 2009-02-04 | Combustor wall apparatus with parts joined by mechanical fasteners |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0802379A GB2457281B (en) | 2008-02-11 | 2008-02-11 | A Combustor Wall Arrangement with Parts Joined by Mechanical Fasteners |
Publications (3)
Publication Number | Publication Date |
---|---|
GB0802379D0 GB0802379D0 (en) | 2008-03-12 |
GB2457281A true GB2457281A (en) | 2009-08-12 |
GB2457281B GB2457281B (en) | 2010-09-08 |
Family
ID=39204500
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0802379A Expired - Fee Related GB2457281B (en) | 2008-02-11 | 2008-02-11 | A Combustor Wall Arrangement with Parts Joined by Mechanical Fasteners |
Country Status (2)
Country | Link |
---|---|
US (1) | US8408010B2 (en) |
GB (1) | GB2457281B (en) |
Families Citing this family (12)
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US10240790B2 (en) | 2013-11-04 | 2019-03-26 | United Technologies Corporation | Turbine engine combustor heat shield with multi-height rails |
EP3066390B1 (en) | 2013-11-04 | 2020-10-21 | United Technologies Corporation | Gas turbine engine wall assembly with offset rail |
EP3084310A4 (en) | 2013-12-19 | 2017-01-04 | United Technologies Corporation | Gas turbine engine wall assembly with circumferential rail stud architecture |
EP3090208B1 (en) | 2013-12-31 | 2018-12-19 | United Technologies Corporation | Gas turbine engine wall assembly with enhanced flow architecture |
US10480787B2 (en) | 2015-03-26 | 2019-11-19 | United Technologies Corporation | Combustor wall cooling channel formed by additive manufacturing |
DE102015224990A1 (en) * | 2015-12-11 | 2017-06-14 | Rolls-Royce Deutschland Ltd & Co Kg | Method for assembling a combustion chamber of a gas turbine engine |
US10669939B2 (en) | 2016-10-26 | 2020-06-02 | Raytheon Technologies Corporation | Combustor seal for a gas turbine engine combustor |
US10670269B2 (en) | 2016-10-26 | 2020-06-02 | Raytheon Technologies Corporation | Cast combustor liner panel gating feature for a gas turbine engine combustor |
US10823410B2 (en) | 2016-10-26 | 2020-11-03 | Raytheon Technologies Corporation | Cast combustor liner panel radius for gas turbine engine combustor |
US10830448B2 (en) | 2016-10-26 | 2020-11-10 | Raytheon Technologies Corporation | Combustor liner panel with a multiple of heat transfer augmentors for a gas turbine engine combustor |
US10935243B2 (en) | 2016-11-30 | 2021-03-02 | Raytheon Technologies Corporation | Regulated combustor liner panel for a gas turbine engine combustor |
US11572835B2 (en) * | 2021-05-11 | 2023-02-07 | General Electric Company | Combustor dilution hole |
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-
2009
- 2009-02-04 US US12/365,181 patent/US8408010B2/en active Active
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Also Published As
Publication number | Publication date |
---|---|
US8408010B2 (en) | 2013-04-02 |
GB2457281B (en) | 2010-09-08 |
GB0802379D0 (en) | 2008-03-12 |
US20090229273A1 (en) | 2009-09-17 |
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Effective date: 20220211 |