Gas Turbine Rotor Contact Surface Optimization
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Solution Overview
Problem
Existing rotor component attachment methods in turbomachines face challenges in achieving uniform pressure distribution under high centrifugal forces, leading to material parameter limitations and potential structural failures.
Innovation Solution
The design features a rotor component with a holding shoulder having a radius slightly smaller than the support radius on the rotor disk, accompanied by an axial opening that extends radially outside the retaining shoulder, allowing for greater deformation and uniform compressive stresses through the contact between the holding and support surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the holding surface and support surface are designed with matching radii, then the contact uniformity is improved, but under high centrifugal forces the material parameters are exceeded leading to structural failure
Solution Approach 1:
The patent changes the geometric parameters of the contact surfaces by designing the holding surface with a smaller radius than the support surface. This parameter modification allows the contact surfaces to accommodate high centrifugal forces while maintaining uniform pressure distribution, preventing material parameter exceedance.
Solution Approach 2:
The patent applies different radii to different parts of the contact surfaces. The holding surface has a smaller radius while the support surface has a larger radius, creating a localized geometric difference that optimizes stress distribution under centrifugal loading conditions.
2Strength
If the holding radius is made smaller than the support radius, then the load capacity is enhanced with more uniform compressive stresses, but the contact area is reduced
Solution Approach 1:
The patent modifies the radius parameter of the holding surface to be smaller than the support surface radius. This parameter change creates optimal stress distribution that enhances load capacity while the axial opening compensates for the reduced contact area by allowing deformation.
3Stability of the object's composition
If an axial opening is introduced in the rotor component, then the deformation capability is improved for uniform stress distribution, but the structural integrity is reduced
Solution Approach 1:
The patent introduces an axial opening that segments the rotor component structure. This segmentation allows the component to deform more freely under centrifugal forces, achieving uniform stress distribution while the opening is strategically positioned to minimize impact on overall structural integrity.
Solution Approach 2:
The axial opening acts as an intermediary element that facilitates stress redistribution. It allows the structure to accommodate deformation demands while maintaining connection between different parts of the rotor component, serving as a mediator between structural integrity and deformation capability.
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 configuration enhances the load capacity and stress distribution, ensuring a more uniform contact and higher load-bearing capability compared to traditional designs, particularly in gas turbines and other rotor applications.
Implementation Method 1
Under the action of centrifugal force during rotation of the rotor, the sealing elements are supported directly on the rotor disk at the end of the sealing elements pointing towards the rotor axis.
Data Source
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Figure 2
AI summary
The invention relates to a rotor for a gas turbine having a rotor disk (01) on which there are a plurality of rotor components (11) distributed around the circumference. The rotor disk (11) has a circumferential securing shoulder (04) with a contact face (05). Retaining faces (16) come to bear against the contact face (06), each of said retaining faces consisting of a retaining shoulder (15) of the respective rotor component (11) and being designed with a form that complements the contact face. In order to optimize the bearing stresses between the retaining shoulder (15) and the securing shoulder (05), the retaining face (16) has a smaller radius than the contact face (06), namely the retaining radius is at least 0.99 times and at most 0.995 times the contact radius. Also provided is an axially extending aperture (12) in the rotor component (11), the width of which in the circumferential direction is 25% to 75% of the rotor component width in the circumferential direction.