Multi-piece Heat Shield for Gas Turbine Fairings
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Solution Overview
Problem
Gas turbine engine fairings are exposed to high temperatures due to direct gas flow, causing undesirable heating of the frame and potentially leading to material degradation, which can be costly and inefficient.
Innovation Solution
A multi-piece heat shield assembly is designed to be easily assembled within the frame, comprising multiple overlapping or joined pieces that block line-of-sight from the fairing to the frame, reducing radiation heating and allowing the use of less expensive materials like steel for the casings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a fairing is directly exposed to gas flow including combustion gases, then the fairing can be heated to high temperatures during operation, but the frame is heated in an undesirable manner which can lead to material degradation
Solution Approach 1:
A heat shield assembly is introduced as an intermediary component positioned between the fairing and the frame. This heat shield blocks radiant heat transfer from the fairing to the frame, preventing the frame from being heated by the hot combustion gases while allowing the fairing to remain exposed to the gas flow for its intended function
2Reliability
If a heat shield is added to protect the frame from heat transfer, then material degradation is prevented, but device complexity increases
Solution Approach 1:
The heat shield is divided into multiple separate pieces including a first heat shield piece, a second heat shield piece, and a third heat shield piece. These segmented pieces can be individually manufactured and assembled to form the complete heat shield assembly, reducing the complexity of manufacturing and installation compared to a single large heat shield component
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
The heat shield effectively reduces radiant heat transfer to the inner and outer casings, enabling the use of less expensive materials while maintaining structural integrity and operational efficiency.
Implementation Method 1
The heat shield effectively reduces radiant heat transfer to the inner and outer casings
Data Source
AI summary
An assembly for a gas turbine engine includes a first casing, a second casing, and struts extending from the first casing to support the second casing. The assembly further includes a fairing and a multi-piece heat shield assembly. The fairing is disposed between the first casing and the second casing and around each of the struts. The multi-piece heat shield assembly includes a first shield extending between the first casing and the fairing, and a second shield extending between the fairing and the first casing. The multi-piece heat shield assembly further includes a third shield extending between the fairing and the second casing, and fourth and fifth heat shields extending from the third heat shield between the fairing and each of the struts.