Gas Turbine Liner Panel with Circumferential Rail Studs
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Solution Overview
Problem
In gas turbine engines, the large tolerances between cast liner panels and sheet metal shells complicate effective sealing, especially at high operational temperatures and lower emission requirements, leading to potential leakage issues.
Innovation Solution
The design incorporates a liner panel with a rail and studs extending from the cold side, which includes a perimeter rail and multiple circumferential rails to define impingement cavities and dilution passages, allowing for improved sealing by deflecting the support shell to close gaps and form a tight seal with the liner panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If large tolerances are used between cast liner panels and sheet metal shells, then manufacturing ease is improved, but sealing effectiveness deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the sealing interface by introducing circumferential rails with studs that extend into recesses of the support shell. This creates a stepped sealing surface that accommodates tolerance variations while maintaining effective sealing contact between the liner panel and support shell.
Solution Approach 2:
The circumferential rail acts as an intermediary element between the liner panel and the support shell. The rail with its studs provides an intermediate sealing interface that bridges the gap caused by large tolerances, enabling effective sealing without requiring tight manufacturing tolerances on the primary mating surfaces.
2Reliability
If circumferential rails with studs are added to the liner panel, then sealing effectiveness is improved, but device complexity increases
Solution Approach 1:
The sealing system is segmented into distinct functional elements: the circumferential rail, the studs extending from the rail, the recesses in the support shell, and the fasteners. This segmentation allows each element to be optimized for its specific function while simplifying the overall assembly process and reducing the complexity of achieving effective sealing.
Solution Approach 2:
The circumferential rail with studs is pre-formed as an integral part of the liner panel assembly before installation. This preliminary preparation ensures that the sealing interface is already configured to accommodate tolerance variations, reducing the complexity of on-site adjustment and assembly operations.
3Reliability
If the support shell is deflected to close gaps, then sealing effectiveness is improved, but stress on the shell increases
Solution Approach 1:
The patent changes the stress distribution parameters by introducing the circumferential rail with studs that create a distributed sealing interface. Instead of concentrating sealing forces at a single interface, the studs distribute the loading across multiple contact points, reducing peak stresses in the support shell while maintaining effective sealing.
Solution Approach 2:
The circumferential rail serves as a stress-distributing intermediary between the liner panel and support shell. It mediates the sealing function while distributing mechanical loads across multiple stud contact points, preventing excessive stress concentration in the support shell structure.
Data Source
AI summary
A liner panel for use in a gas turbine engine. The liner panel has a hot side and a cold side. The liner panel includes a rail extending from the cold side and a multiple of studs extending from the cold side. At least one of the multiple of studs extends from, in part, the rail.