Ceramic Matrix Turbine Blade Platform Ply Architecture
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Solution Overview
Problem
Design and manufacture of turbine blades from composite materials pose challenges in withstanding high temperatures and efficiently managing radial forces in gas turbine engines, particularly in blocking hot gases from migrating towards the root and transferring radial forces effectively.
Innovation Solution
A turbine blade constructed with a ceramic matrix composite material, featuring a root, airfoil, and platform, where core and attachment fiber-reinforcement plies are strategically arranged to transfer radial forces directly to the root, minimizing interlaminar shear forces and incorporating filler and transition reinforcement fibers to enhance structural integrity and block gas migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If composite material layers are used in turbine blades, then high-temperature resistance is improved, but radial force transfer efficiency deteriorates
Solution Approach 1:
The patent employs a composite material structure consisting of a ceramic matrix composite material with specifically oriented fiber reinforcement plies. The attachment fiber-reinforcement plies are arranged to extend from the root through the platform to the airfoil, creating a load path that efficiently transfers radial forces while maintaining high-temperature resistance. This composite structure resolves the contradiction by integrating both thermal and mechanical performance requirements into a unified material system.
2Force
If fiber-reinforcement plies are arranged to transfer radial forces, then force transfer efficiency is improved, but interlaminar shear stress increases
Solution Approach 1:
The patent applies local quality by differentiating the orientation and distribution of fiber reinforcement plies in different regions of the turbine blade. Attachment fiber-reinforcement plies are specifically oriented to extend continuously from the root through the platform to the airfoil, creating localized load paths that transfer radial forces directly without requiring stress transfer between plies. This localized reinforcement strategy reduces interlaminar shear stress while maintaining force transfer efficiency.
3Object-affected harmful factors
If platform structure is added to block gas migration, then gas blocking capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the gas blocking function with the structural load-bearing function by integrating the platform into the existing root-airfoil structure. The attachment fiber-reinforcement plies that provide structural integrity also form the platform geometry, creating a load-bearing structure that inherently blocks gas migration. This merging of functions achieves gas blocking capability without proportionally increasing device complexity.
Data Source
Figure 1~2
AI summary
A turbine blade (10) of ceramic matrix composite material comprises a root (12) for attaching the turbine blade (10) to a disk, an airfoil (14) shaped to interact with hot gasses moving through the gas path of a gas turbine engine and cause rotation of the turbine blade (10), and a platform (16) having an attachment side facing the root (12) and a gas path side facing the airfoil (14). The platform (16) is arranged between the root (12) and the airfoil (14) and shaped to extend outwardly from the root (12) and the airfoil (14) in order to block gasses from the gas path migrating toward the root (12) when the turbine blade (10) is used in a gas turbine engine. The turbine blade (10) includes core fiber-reinforcement plies (20) that form part of the root (12) and the airfoil (14) without forming part of the platform (16), at least one gas path fiber-reinforcement ply (22) that forms part of the airfoil (14) and the platform (16), and attachment fiber-reinforcement plies (24) that form part of the root (12) and the platform (16). The number of attachment fiber-reinforcement plies (24) is greater than the number of gas path fiber-reinforcement plies (22) so that radial forces induced on the platform (16) are largely transferred to the root (12) without having to pass between fiber-reinforcement plies (20, 22, 24) of the turbine blade (10).