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Airfoils with improved cooling

A technology of airfoils and cooling channels, applied in the field of airfoils, can solve problems such as uneven cooling, reduced turbine efficiency and power, and increased cooling air consumption

Active Publication Date: 2018-06-22
ANSALDO ENERGIA SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the standard approach results in non-uniform cooling along curved ducts, as heat transfer is lower in areas with the most curved shape compared to straight sections
[0010] A possible countermeasure for standard designs would be to increase cooling air consumption
However, the geometry of the turbulators arranged inside the cooling duct will still be the same, and thus this will result in a lower cooling performance in the 3D shape region compared to straight sections, and non-uniform cooling along the duct will still exist
Furthermore, increasing the cooling air flow, which keeps the metal temperature in the curved portion of the airfoil within predetermined values, will inevitably reduce turbine efficiency and power

Method used

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  • Airfoils with improved cooling
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  • Airfoils with improved cooling

Examples

Experimental program
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Embodiment Construction

[0029] refer to figure 1 , which shows an external view of an airfoil according to the invention for a gas turbine, which is indicated generally at 1 . The airfoil 1 includes an internal cooling circuit ( figure 1 not visible in ), which has an inlet 11 for blowing cooling fluid (which is usually air discharged from the engine's compressor) within its structure, and a pressure side discharge 12 as an outlet at the end of the cooling circuit.

[0030] Next refer to figure 2 , shows the cross-section of the airfoil 1 . in particular, figure 2 The cross-section of exhibits the presence of inner cooling channels 2, 21 and 22 connected to each other in a serpentine configuration. The inner channel 2 is located near the leading edge portion of the airfoil, while the inner channel 22 is located near the trailing edge of the airfoil 1 . Inner channel 21 is an intermediate channel positioned between channel 2 and channel 22 . It will be appreciated that the airfoil may also com...

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Abstract

The present invention relates to an airfoil for a gas turbine comprising an improved turbulator arrangement formed on an internal cooling passage of the airfoil. According to a preferred embodiment of the invention, in order to ensure a constant angle of the cooling flow in the channel with respect to the individual turbulators, the angle formed between the turbulators and the vertical axis is advantageously varied for each turbulator in the curved region. Furthermore, the same principles can be applied to all cooling channels present within the airfoil.

Description

technical field [0001] The present invention relates to an airfoil for a gas turbine comprising an improved turbulator arrangement formed in an internal cooling passage of the airfoil. Background technique [0002] As is known, a gas turbine, or a machine generally configured to obtain useful work by means of elaborating a flow of hot gas, includes components, such as airfoils, configured for such functions. During machine operation, the airfoils require cooling in order to keep the temperature of their parts within acceptable limits. For this reason, the airfoil generally includes longitudinally extending internal passages or ducts configured to receive cooling air. Typically, an airfoil includes a plurality of inner channels connected to each other in a serpentine configuration. Specifically, cooling air enters the cooling circuit in a first channel, which is located near the leading edge, which is the part of the airfoil with a high external thermal load, and exits the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D5/18
CPCF01D5/141F01D5/186F05D2250/185F05D2250/71F05D2240/127Y02T50/60F01D5/18F05D2220/32F05D2260/20
Inventor R.鲍尔S.奈克M.亨泽
Owner ANSALDO ENERGIA SWITZERLAND AG