Turbine Blade Plug Segmentation to Reduce Centrifugal Swelling
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Solution Overview
Problem
The existing techniques for turbine blades, such as those disclosed in JP 2010 31865 A, face issues with plug durability due to centrifugal forces causing creep deformation and swelling, which can lead to reduced durability over time.
Innovation Solution
The turbine blade design incorporates a plug formed of multiple plug pieces that are inserted into mounting grooves on the side surfaces of a recess, with the grooves and recess orientation configured to minimize deformation and swelling by aligning the plug pieces in the longitudinal direction, reducing the interval between grooves, and forming the recess and grooves in a direction inclined in the circumferential and axial directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single plug is used to close the recess opening, then the sealing function is simple, but the plug swells outward due to centrifugal force reducing durability
Solution Approach 1:
The plug is divided into multiple plug pieces (first plug piece and second plug piece) that are inserted into separate mounting grooves. This segmentation reduces the centrifugal force acting on each individual piece, preventing swelling and improving durability while maintaining a relatively simple overall structure.
2Ease of operation
If mounting grooves are separated in the axial direction to facilitate plug insertion, then insertion is easier, but the middle portion of the plug is more susceptible to centrifugal deformation
Solution Approach 1:
The mounting grooves are arranged in the circumferential direction rather than the axial direction. This dimensional change allows the plug pieces to be distributed around the circumference, reducing the span between support points and minimizing centrifugal deformation while still facilitating easy insertion from the axial direction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces plug swelling and improves durability by minimizing deformation caused by centrifugal forces, allowing the turbine blade to operate reliably for a longer period.
Implementation Method 1
a portion of the plug which is not inserted into the mounting grooves swells to the outside in the radial direction of the rotor by a centrifugal force
Implementation Method 2
the middle portion of the plug is easily subjected to creep deformation outwards in the radial direction by a centrifugal force applied to the plug
Data Source
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AI summary
The present invention relates to a turbine blade (10). The turbine blade (10) of the present invention comprises a wing main body (11) which is attached to a rotor main body (2) in such a manner as to extend from the rotor main body (2) toward a radial direction outer side of the rotor main body (2), and a tip shroud (20) which is fixed to the radial direction outer side of the wing main body (11). A cooling passage (14) is disposed in the wing main body (11) in such a manner as to extend in a radial direction of the rotor main body (2) so that a coolant is circulated. The tip shroud (20) comprises a shroud main body (30) where a recess (60) which is open toward the radial direction outer side and communicates with the cooling passage (14) is disposed at an outer circumferential end surface, and a plug (70) which comprises a plurality of plug pieces (71, 72), each of which is inserted into an attachment groove (61a) disposed at a side surface of the recess (60) to collaboratively block the opening of the recess (60).