This application is related to co-pending U.S. application Ser. Nos. 14/977,228, 14/977,102, 14/977,078, 14/977,152, 14/977,175, 14/977,200, 14/977,247, and 14/977,270, all filed on Dec. 21, 2015 and co-pending U.S. application Ser. Nos. 15/239,994, 15/239,968, 15/239,985, 15/239,940 and 15/239,930 all filed on Aug. 18, 2016.
The disclosure relates generally to turbine systems, and more particularly, to reducing pressure loss in a multi-wall turbine blade cooling circuit.
Gas turbine systems are one example of turbomachines widely utilized in fields such as power generation. A conventional gas turbine system includes a compressor section, a combustor section, and a turbine section. During operation of the gas turbine system, various components in the system, such as turbine blades, are subjected to high temperature flows, which can cause the components to fail. Since higher temperature flows generally result in increased performance, efficiency, and power output of the gas turbine system, it is advantageous to cool the components that are subjected to high temperature flows to allow the gas turbine system to operate at increased temperatures.
Turbine blades of a gas turbine system typically contain an intricate maze of internal cooling channels. The cooling channels receive air from the compressor of the gas turbine system and pass the air through the internal cooling channels to cool the turbine blades. The teed pressure of the air passed through the cooling channels is generally at a premium, since the air is bled off of the compressor. To this extent, it is useful to provide cooling channels that reduce non-recoverable pressure loss; as pressure losses increase, a higher feed pressure is required to maintain an adequate gas-path pressure margin (back-flow margin). Higher feed pressures result in higher leakages in the secondary flow circuits (e.g., in rotors) and higher feed temperatures.
A first aspect of the disclosure provides a turbine blade cooling system, including: a first turn for redirecting a first flow of gas flowing through a first channel of a turbine blade into a central plenum of the turbine blade; and a second turn for redirecting a second flow of gas flowing through a second channel of the turbine blade into the central plenum; wherein the first turn is offset from the second turn to reduce impingement of the first flow of gas and the second flow of gas in the central plenum.
A second aspect of the disclosure provides a turbine bucket, including: a shank; a blade coupled to the shank; and a cooling system, the cooling system including: a first turn for redirecting a first flow of gas flowing through a first channel of the blade into a central plenum of the blade; a second turn for redirecting a second flow of gas flowing through a second channel of the blade into the central plenum of the blade; wherein the first turn is offset from the second turn to reduce impingement of the first flow of gas and the second flow of gas in the central plenum of the blade, the reduced impingement decreasing pressure loss in the central plenum of the blade.
A third aspect of the disclosure provides a turbine bucket, comprising: a shank; a multi-wall blade coupled to the shank; and a cooling system, the cooling system including: a first turn for redirecting a first flow of gas flowing through a first channel into a central plenum of the blade; a second turn for redirecting a second flow of gas flowing through a second channel into the central plenum of the blade, the first flow of gas and the second flow of gas combining in the central plenum; wherein the first turn is angularly offset from the second turn to reduce impingement of the first flow of gas and the second flow of gas in the central plenum of the blade, the reduced impingement decreasing pressure loss in the central plenum.
The illustrative aspects of the present disclosure solve the problems herein described and/or other problems not discussed.
These and other features of this disclosure will be more readily understood from the following detailed description of the various aspects of the disclosure taken in conjunction with the accompanying drawing that depicts various embodiments of the disclosure.
It is noted that the drawing of the disclosure is not to scale. The drawing is intended to depict only typical aspects of the disclosure, and therefore should not be considered as limiting the scope of the disclosure. In the drawing, like numbering represents like elements between the drawings.
As indicated above, the disclosure relates generally to turbine systems, and more particularly, to reducing pressure loss in a multi-wall turbine blade cooling circuit.
Turning to
The shank 4 and blade 6 may each be formed of one or more metals (e.g., steel, alloys of steel, etc.) and can be formed (e.g., cast, forged or otherwise machined) according to conventional approaches. The shank 4 and blade 6 may be integrally formed (e.g., cast, forged, three-dimensionally printed, etc.), or may be formed as separate components which are subsequently joined (e.g., via welding, brazing, bonding or other coupling mechanism).
The SS cooling circuit 18 includes a feed channel 22 for directing a flow of cooling gas 24 (e.g., air) radially outward toward a tip area 48 (
The PS cooling circuit 20 includes a feed channel 32 for directing a flow of cooling gas 34 (e.g., air) radially outward toward the tip area 48 (
According to embodiments, referring to
In the blade 6, the flow of cooling gas 42 passes radially outward through the central plenum 44 (out of the page in
A first embodiment of a pressure loss reducing structure 40 including opposing feeds is depicted in
Also depicted in
As shown in
The flow of cooling gas 36 flows through the return channel 38 in a first direction (into the page in
An embodiment of a pressure loss reducing structure 50 including angled feeds is depicted in
Also depicted in
Unlike the pressure loss reducing structure 40 shown in
By preventing impingement of the flows of cooling gas 26, 36 as the flows enter the central plenum 44, pressure loss is reduced when using the pressure loss reducing structure 40, 50. Thus, a lower feed pressure is required to maintain an adequate gas-path pressure margin (back-flow margin). Further, lower feed pressures result in lower leakages in the secondary flow circuits (e.g., in rotors) and lower feed temperatures.
In various embodiments, components described as being “coupled” to one another can be joined along one or more interfaces. In some embodiments, these interfaces can include junctions between distinct components, and in other cases, these interfaces can include a solidly and/or integrally formed interconnection. That is, in some cases, components that are “coupled” to one another can be simultaneously formed to define a single continuous member. However, in other embodiments, these coupled components can be formed as separate members and be subsequently joined through known processes (e.g., fastening, ultrasonic welding, bonding).
When an element or layer is referred to as being “on”, “engaged to”, “connected to” or “coupled to” another element, it may be directly on, engaged, connected or coupled to the other element, or intervening elements may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to”, “directly connected to” or “directly coupled to” another element, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
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