Stator Vane Airfoil Profile Optimization for Gas Turbine Efficiency
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Solution Overview
Problem
Gas turbine stator vanes face challenges in operating efficiently at higher temperatures and pressures, requiring improved airfoil profiles that balance aerodynamic and mechanical loading while extending the life of compressor components.
Innovation Solution
A novel airfoil profile for the ninth stage compressor stator vane is designed using Cartesian coordinate values, optimized for aerodynamic efficiency and mechanical loading, and scalable within manufacturing tolerances, utilizing a directionally solidified alloy for enhanced creep life and integration with a 'square-faced' base for secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional airfoil profiles are used in gas turbines operating at higher temperatures and pressures, then the existing turbine airfoils can be replaced, but the aerodynamic efficiency and mechanical loading are not optimized for increased operating conditions
Solution Approach 1:
The patent applies parameter changes by developing a new airfoil profile with specific geometric parameters (thickness distribution, camber, leading edge radius) that are optimized for higher temperature and pressure operations. The profile coordinates are precisely defined to achieve optimal aerodynamic performance while maintaining structural integrity under increased mechanical loading and thermal stress conditions.
2Productivity
If airfoil profiles are redesigned to accommodate higher operating temperatures and pressures, then turbine performance is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by providing specific coordinate values at different locations along the airfoil profile (leading edge, mid-chord, trailing edge, suction side, pressure side). Each section of the airfoil has locally optimized geometry to balance aerodynamic performance with manufacturability, allowing critical areas to meet tighter tolerances while less critical areas have relaxed specifications.
3Duration of action of stationary object
If stator vanes are designed for extended life at higher temperatures, then creep margin is increased, but aerodynamic efficiency may be compromised
Solution Approach 1:
The patent applies composite materials by specifying directionally solidified superalloy construction for the airfoil, which combines high-temperature strength and creep resistance with maintained aerodynamic surface quality. The material composition and microstructure are engineered to provide both extended thermal life and smooth surface finish for optimal airflow characteristics.
Data Source
AI summary
An airfoil for a stator vane having an uncoated profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in Table I is provided. The profile is carried only to three decimal places wherein Z is a distance from a platform on which the airfoil is mounted and X and Y are coordinates defining the profile at each distance Z from the platform.