Mid-Turbine Frame Rod Integrating Case Flange Support
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Solution Overview
Problem
Current gas turbine engine case structures add complexity, weight, and cost due to additional support structures, making it desirable to develop more efficient designs.
Innovation Solution
A mid-turbine frame is introduced between the high pressure and low pressure turbine sections, featuring a support structure that extends through the interface between the two cases, including an airfoil for flow direction and a fastening member for securing the support structure, which eliminates the need for additional case structures and reduces complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional case structures are added to support the mid-turbine frame, then structural support is improved, but device complexity and weight increase
Solution Approach 1:
The mid-turbine frame support structure is merged with the interface between the first and second turbine cases. The support structure extends through the interface and is attached to both cases, combining the support function with the existing case structures rather than adding separate support components.
Solution Approach 2:
The interface between the first and second turbine cases serves multiple functions: it provides structural support for the mid-turbine frame, maintains the seal between cases, and provides attachment points for the support structure. This multi-functionality eliminates the need for additional dedicated support structures.
2Strength
If additional case structures are added to support the mid-turbine frame, then structural support is improved, but weight increases
Solution Approach 1:
The support structure is integrated into the existing case structures at their interface, eliminating the need for additional separate support components that would add weight. The same structural elements provide both support and case functions.
3Stability of the object's composition
If the support structure extends through the interface between cases, then structural stiffness is improved, but manufacturing complexity increases
Solution Approach 1:
The support structure is divided into segments: a first portion attached to the first turbine case and a second portion attached to the second turbine case, with the support structure extending through the interface between them. This segmentation allows each case to be manufactured and assembled separately before final integration.
Solution Approach 2:
The support structure portions are attached to their respective cases before the cases are assembled together at the interface. This preliminary attachment simplifies the final assembly process and maintains structural stiffness.
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 design enhances the compactness of the gas turbine engine, reduces weight and cost, and improves power density by integrating support structures within the existing case structures, thereby simplifying assembly and increasing structural stiffness.
Implementation Method 1
The mid-turbine frame includes an airfoil for directing flow between the first turbine section and the second turbine section
Data Source
AI summary
A turbine section of a gas turbine engine includes a first turbine supported for rotation about an axis, a second turbine spaced axially aft of the for first turbine section for rotation about the axis, and a mid-turbine frame disposed between the first turbine and the second turbine defining a passage between the first turbine and the second turbine. A first case surrounds the first turbine and a second case surrounding the second turbine and attached to the first case. The mid-turbine frame is disposed between the first turbine section and the second turbine section and includes at least one support structure extending through an interface between the first turbine case and the second turbine case.