Turbomachine Blade Platform Wall Geometry for Fabrication
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Solution Overview
Problem
The fabrication of turbomachine blades with complex tip and root platform walls is challenging due to the need for multiple molds and five-axis machining centers, making them difficult and costly to produce.
Innovation Solution
The blade design features a first platform wall section with straight line segments forming 90°-180° angles relative to the radial direction, simplifying fabrication by allowing alignment and symmetry, and a method for digital modeling using construction curves to create aerodynamically ideal platform walls that are integrally formed with the airfoil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional complex platform wall designs are used, then aerodynamic performance is maintained, but fabrication difficulty and tooling complexity increase
Solution Approach 1:
The invention changes the geometric parameters of the platform wall by introducing straight line segments with specific angles (90°-180°/N) relative to the radial direction. This parameter modification transforms the complex curved surfaces into simpler linear segments that are easier to fabricate while maintaining aerodynamic performance
Solution Approach 2:
The invention introduces asymmetric angular orientation of the platform wall segments relative to the radial direction, with each side forming an angle of 90°-180°/N. This asymmetric design enables alignment between adjacent blades while simplifying the overall fabrication process and reducing tooling requirements
2Ease of manufacture
If complex platform wall designs are used, then aerodynamic performance is maintained, but manufacturing cost increases
Solution Approach 1:
By defining specific angular parameters (90°-180°/N) for the platform wall segments, the invention simplifies manufacturing while maintaining precision through standardized geometric relationships that are easier to control and reproduce during fabrication
3Shape
If multiple molds and five-axis machining centers are used, then complex blade shapes are achieved, but productivity decreases
Solution Approach 1:
The invention modifies the shape parameters by introducing straight line segments with specific angular orientations, which maintains the essential aerodynamic shape while enabling simpler fabrication processes that improve productivity
Solution Approach 2:
The platform wall is segmented into straight line sections on either side of the airfoil, each forming a specific angle with the radial direction. This segmentation simplifies the overall complex shape into manageable linear segments that can be fabricated more efficiently
Data Source
AI summary
A blade for a turbomachine bladed wheel having N blades.At one end, the blade presents a platform that is formed integrally with an airfoil of the blade.Over a portion of the axial extent of the blade, a section through the platform wall on a plane perpendicular to the axis (X) of the wheel is constituted mainly by two first straight line segments arranged respectively on the two sides of the airfoil.Each of these segments forms an angle of 90°-180°/N relative to the radial direction on either side of the airfoil.