Turbine Stator Fin Layout for Blade-Root Crossflow Blocking
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Solution Overview
Problem
The zone of the blade root in turbine engine stator parts experiences secondary aerodynamic flows, leading to corner separation, pressure losses, and aerodynamic blockage, particularly at high angles of attack, which affects the efficiency and operability of the flow straightener.
Innovation Solution
A stator part design featuring a platform with blades and a fin extending radially, where the fin's leading and trailing edges are inclined to channel and block crossflows, reducing corner separation and enhancing flow deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional blade geometry is used, then the structure is simple, but corner separation and aerodynamic blockage occur at high angles of attack
Solution Approach 1:
The blade is divided into multiple functional zones: a root portion with modified geometry to control corner flows, a mid-section for primary flow guidance, and a tip portion for outlet flow control. This segmentation allows each zone to address specific flow issues independently, improving overall reliability without excessive complexity
Solution Approach 2:
The invention introduces a radial dimension to the blade geometry by varying the thickness and curvature of the blade in the radial direction. The blade thickness is increased at the root and decreased toward the tip, creating a three-dimensional flow control structure that effectively manages corner separation and blockage phenomena
2Reliability
If blade thickness is increased to prevent corner separation, then flow guidance improves, but pressure losses increase
Solution Approach 1:
The blade geometry is optimized locally at different positions: the root portion has increased thickness and modified curvature to prevent corner separation, while the mid and tip sections have reduced thickness to minimize pressure losses. This local quality variation allows the blade to address corner separation without incurring excessive energy losses across the entire blade span
3Reliability
If fin height is increased to block crossflows, then corner blockage reduces, but device complexity increases
Solution Approach 1:
The fin structure is merged with the blade root to form an integrated flow control element. The fin is not a separate component but is formed as an extension of the blade geometry itself, reducing device complexity while maintaining the ability to block crossflows and reduce corner blockage effectively
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
The design improves fluid flow efficiency by minimizing corner separation and blockage, especially at high angles of attack, thereby enhancing the performance of the turbine engine.
Implementation Method 1
a fin (28) comprising a leading edge (30) and a trailing edge (32), the fin extending into the stream radially relative to an axis (Δ) of the turbine engine from the platform, facing an upper side (124) of the first blade (24) and a lower side (126) of the second blade (26)
Data Source
AI summary
The invention relates to a stator part (20) comprising a platform (22), a first blade (24), a second blade (26), and a fin (28) having a leading edge (30) and a trailing edge (32), the fin extending opposite an upper surface (124) of the first blade and a lower surface (126) of the second blade, the leading edge comprising a leading point (34) located on the platform, a tangent to the leading edge at the leading point extending between the first blade and a radial leading plane (Pa) and the leading point, and the trailing edge comprising a trailing point (36) located on the platform, a tangent to the trailing edge at the trailing point extending between the second blade and a radial trailing plane (Pf) and the trailing point.