Turbofan Fan Downstream Guide Vane Profile Optimization
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Solution Overview
Problem
Existing fan downstream guide vane profiles in turbofan engines are not optimally designed, leading to increased pressure losses and fuel consumption, which reduces engine operating stability and efficiency.
Innovation Solution
A novel design for the fan downstream guide vane profiles featuring a specific, optimized skeleton line angle distribution and thickness distribution, with upper and lower limitations and interpolated intermediate profiles, to minimize pressure losses and expand the working range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional downstream guide vane profiles are used, then the engine can operate, but pressure losses increase and fuel consumption increases
Solution Approach 1:
The patent applies parameter changes by optimizing the skeleton line angle distribution and thickness distribution parameters of the guide vane profiles. Specifically, it defines precise mathematical relationships for the skeleton line angles at different chord positions (e.g., α₁ at 0-10% chord, α₂ at 10-20% chord, etc.) and thickness distributions, transforming the conventional fixed-profile approach into an optimized variable-parameter design that minimizes pressure losses and fuel consumption.
2Reliability
If conventional downstream guide vane profiles are used, then the structure is simple, but engine operating stability is reduced
Solution Approach 1:
The patent improves engine operating stability by implementing precise parameter changes in the profile geometry. It defines specific skeleton line angle distributions across multiple chord sections (with angles ranging from 0° to 15° at different positions) and corresponding thickness distributions, creating an optimized profile that enhances flow control and stability while managing the increased design complexity through systematic mathematical definitions.
3Adaptability or versatility
If conventional downstream guide vane profiles are used, then manufacturing is straightforward, but the working range is limited
Solution Approach 1:
The patent expands the working range by implementing parameter changes that create profiles adaptable to various operating conditions. The optimized skeleton line angles and thickness distributions are designed to maintain performance across different flow rates and engine conditions, enhancing versatility while managing manufacturing complexity through precise but reproducible geometric definitions.
Data Source
AI summary
Fan downstream guide vane profiles have an optimized form of skeleton line angle distribution in an area situated between an upper and a lower limitation as well as a specific thickness distribution superimposed on the respective skeleton line angle distribution. Such guide vanes are characterized by lower pressure losses and a larger working range than the known downstream guide vanes, thereby reducing fuel consumption of the engine and increasing the operating stability thereof.