Clustered Stub Ceramic Core for Turbine Blade Casting
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Solution Overview
Problem
The fragility of ceramic cores used in casting turbine blades leads to breakage during manufacturing and handling, resulting in increased costs and reduced efficiency due to the need for thicker cores, which compromise the strength and aerodynamic performance of the blades.
Innovation Solution
A ceramic casting core with a plurality of rods defining internal cooling channels and a shank for the dovetail, featuring a bulb and clustered stubs to enhance strength, minimizing volume and maximizing interconnection while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thicker ceramic cores are used to increase strength and reduce breakage, then manufacturing reliability improves, but the strength and aerodynamic performance of the turbine blades deteriorate due to increased material loss
Solution Approach 1:
The ceramic core is segmented into multiple functional components: a bulb portion for structural reinforcement, multiple rod portions extending from the bulb to define cooling channels, and a shank portion for dovetail formation. This segmentation allows each component to be optimized independently - the bulb provides strength without requiring the entire core to be thicker, thus resolving the contradiction between core strength and blade material loss.
Solution Approach 2:
The core design transitions from a conventional uniform structure to a multi-dimensional clustered configuration where rod portions are arranged in specific spatial patterns (e.g., triangular clusters) around the bulb. This dimensional arrangement provides structural reinforcement in critical areas without increasing overall core volume, thereby preventing blade material loss while maintaining core strength.
2Productivity
If thicker ceramic cores are used to prevent breakage during handling, then manufacturing yield improves, but the aerodynamic performance of the blades deteriorates due to reduced material available for blade geometry
Solution Approach 1:
The core employs local quality enhancement by concentrating material where structurally necessary - the bulb portion provides localized reinforcement at the core center, while rod portions are strategically positioned to support specific cooling channels. This localized material distribution increases manufacturing yield without requiring uniform thickness increases that would compromise aerodynamic blade geometry.
Solution Approach 2:
The core functions as a composite structure combining the bulb portion (providing structural integrity) with multiple rod portions (defining cooling channels). This composite arrangement achieves high manufacturing yield through efficient material utilization, allowing thin-walled blade geometries to be cast without sacrificing core strength during handling.
3Reliability
If more extensive interconnection of core components is implemented to increase strength, then core reliability improves, but device complexity increases
Solution Approach 1:
The core components (bulb, rods, and shank) are merged into a single integrated ceramic structure formed in one piece during the casting process. This merging approach ensures structural integrity and reliability through continuous material flow between components, while avoiding the complexity of assembling multiple separate parts. The clustered rod arrangement within the bulb provides extensive interconnection without requiring complex external joinery.
Data Source
AI summary
A casting core for a turbine blade includes a plurality of rods extending above a shank. The rods define internal cooling channels in the airfoil of the blade, and the shank defines an inlet channel in the dovetail of the blade. A plurality of stubs are clustered together at a bulb joined to the shank and radiate outwardly to integrally join different ones of the rods for increasing strength of the core.