Turbomachine Rotor Blade Root Elevation Gap Control
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Solution Overview
Problem
Existing rotors for turbomachines face challenges in reducing stresses at the notch base of blade roots and leakage through the gap between the blade root and rotor main part, as large radii to minimize stresses can lead to increased gap width and leakage.
Innovation Solution
The rotor design incorporates a blade root with a depression and a rotor main part having a protrusion, where the first delimiting face features an elevation that narrows the gap and allows for a larger radius to reduce stresses, while the elevation also minimizes leakage by forming a discontinuity that narrows the gap between the blade root and rotor main part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If large radii are provided at the blade root to reduce stresses in the notch base, then stresses in the notch base are reduced, but the gap width increases leading to increased leakage
Solution Approach 1:
The invention applies different radius values at different locations of the blade root. Specifically, the first radius at the notch base is larger to reduce stresses, while the second radius at the gap region is smaller to reduce leakage. This local differentiation allows simultaneous optimization of both stress reduction and leakage prevention.
2Loss of substance
If the gap width is reduced to minimize leakage, then leakage through the gap is reduced, but stresses in the notch base increase
Solution Approach 1:
The blade root is designed with non-uniform radius distribution where the first radius at the notch base is larger to reduce stresses, while the second radius at the gap region is smaller to minimize leakage. This localized geometric optimization allows the structure to simultaneously achieve both stress reduction and leakage prevention.
Data Source
AI summary
A rotor for a turbomachine has at least one blade and has at least one rotor main part, which has at least one recess, in which a blade root of the least one blade is interlockingly received, wherein the blade root comprises at least one depression, in which at least one protrusion of the at least one rotor main part, which protrusion delimits the at least one recess in regions is received, wherein the at least one depression is delimited by a first delimiting face on the blade root side and the at least one protrusion is delimited by a second delimiting face on the rotor main part side. At least the first delimiting face has at least one elevation which narrows a gap at least in regions, which extends between the first delimiting face and the second delimiting face.