Turbine Nozzle Outer Platform Hooking Edges
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Solution Overview
Problem
Turbine performance is hindered by significant radial gas leaks between the duct and chambers, despite the presence of sealing means, which reduces efficiency and requires additional intermediate parts for assembly and support.
Innovation Solution
A sectorized annular nozzle design with an outer platform that integrates a coaxial outer wall and shell, featuring axially oriented hooking edges and collars to secure the nozzle to the turbine casing, eliminating the need for intermediate parts and enhancing sealing efficiency by maximizing contact surface area and reducing leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If sealing means are placed between nozzle sectors and ring sectors, then radial gas leaks are reduced, but device complexity increases due to additional components and assembly requirements
Solution Approach 1:
The patent merges the sealing function into the outer platform structure itself. The outer platform is designed with an integrated configuration where the outer wall and straightening blades form a unified structure that inherently seals the radial gap between the nozzle duct and the ring, eliminating the need for separate sealing components.
Solution Approach 2:
The patent removes the intermediate support structure from the design. By directly integrating the outer platform to the turbine casing and optimizing the outer wall configuration, the design eliminates intermediate parts that were previously needed for assembly and support, simplifying the overall structure while maintaining sealing effectiveness.
2Ease of manufacture
If intermediate parts are used to secure nozzle sectors to turbine casing, then assembly is facilitated, but device complexity and weight increase
Solution Approach 1:
The outer platform is designed as an integrated component that combines structural support, sealing, and attachment functions. The outer wall and platform form a unified structure that directly interfaces with the turbine casing, eliminating the need for separate intermediate support parts while maintaining ease of assembly.
3Strength
If outer wall and shell are integrally formed, then structural integrity is enhanced, but manufacturing complexity increases
Solution Approach 1:
The outer wall and outer shell are designed as an integral structure where the shell is formed as a continuous extension of the outer wall. This integration enhances structural rigidity and sealing effectiveness while the design maintains manufacturability through appropriate geometric transitions and standardized fabrication processes.
Data Source
AI summary
A sector of a sectorized annular nozzle of a turbine of a turbomachine comprises an outer platform having an outer wall connected to a coaxial inner wall via at least one straightening fixed blade. The outer platform includes hooking means that hook the outer platform to a turbine fixed casing. The outer platform includes an outer circular shell, axially offset with respect to the outer wall and integrally formed with the outer wall, and the outer shell is intended to surround an angular portion of a rotor wheel. The hooking means includes an upstream circular edge and a downstream circular edge extending axially, said upstream and downstream edges being respectively configured to attach to an upstream hook and a downstream hook of said turbine casing, and said upstream and downstream edges being oriented in the downstream direction.