Gas Turbine Liner Hanger Cable Assembly
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Solution Overview
Problem
Gas turbine engine hanger assemblies face challenges in accommodating misalignment, thermal growth, pressure loads, and high temperatures within a confined environment, requiring a cost-effective solution that simplifies assembly and maintains structural integrity.
Innovation Solution
A hanger assembly for a gas turbine engine featuring a cable system with a fastening member and anti-rotation insert, where the cable is secured to both the duct and the liner, utilizing a ball-and-mount configuration with a tapered collar to accommodate movement and provide tension, and a seal to prevent cooling air leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex hanger assembly is used to accommodate misalignment, thermal growth, pressure loads, and high temperatures, then the structural integrity and reliability are improved, but the device complexity and assembly difficulty increase
Solution Approach 1:
The hanger assembly is divided into separate functional components: a cable for tension loading, an insert with anti-rotation features for angular constraint, a ball for spherical movement accommodation, and a mount for liner attachment. This segmentation allows each component to address specific requirements independently while simplifying the overall assembly process.
Solution Approach 2:
The hanger assembly incorporates dynamic elements including a spherical ball that can rotate and move within the mount to accommodate thermal growth and misalignment, and a cable that can elongate to handle thermal expansion. These dynamic features enable the hanger to adapt to changing conditions without requiring complex adjustment mechanisms.
2Ease of manufacture
If a simplified hanger assembly is used to reduce cost and assembly complexity, then the ease of manufacture and assembly are improved, but the ability to accommodate thermal growth and pressure loads may be compromised
Solution Approach 1:
The cable is designed with specific material properties and cross-sectional characteristics that allow it to elongate and contract in response to temperature changes and applied loads. The insert includes a tapered collar with specific geometric parameters that guide the cable's movement and accommodate thermal expansion while maintaining connection integrity.
Solution Approach 2:
The hanger assembly utilizes composite construction combining different materials with complementary properties: the cable uses high-strength, temperature-resistant material for tension loading, the insert uses rigid material for angular constraint, and the ball uses spherical material for movement accommodation. This composite approach achieves multiple functions simultaneously.
3Volume of moving object
If the hanger assembly is positioned within a confined physical envelope, then the space utilization is improved, but the accessibility for assembly and maintenance is reduced
Solution Approach 1:
The hanger assembly components are designed to nest within each other during assembly: the ball fits within the mount, the cable passes through the insert, and the entire assembly fits within the confined envelope. This nested configuration maximizes space utilization while maintaining assembly accessibility through a systematic assembly sequence.
Data Source
AI summary
A liner for a gas turbine engine includes a liner defining an inner surface exposed to exhaust gases and a duct spaced radially outward of the liner. A plurality of hanger assemblies is disposed within the radial space between the liner and the duct for supporting the liner relative to the duct. Each of the hanger assemblies includes a cable having a first end attached to the duct and a second end attached to the liner.