Compressor Wheel Area Ratio Optimization
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Solution Overview
Problem
Existing compressor wheels in exhaust-gas turbochargers are not optimized for efficient pressure increase in two-stage supercharging systems, leading to suboptimal performance.
Innovation Solution
The compressor wheel geometry is optimized by setting the ratio of the outlet area to the inlet area greater than 60%, featuring non-recessed and recessed blades with specific leading and trailing edges, allowing for efficient pressure increase in both two-stage and single-stage systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressor wheel geometry is optimized for two-stage supercharging systems, then the pressure increase efficiency is improved, but the adaptability to single-stage systems deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the ratio of outlet area to inlet area to be greater than 60%. This specific geometric parameter modification enables the compressor wheel to achieve efficient pressure increase in two-stage supercharging systems while the patent acknowledges the trade-off that such optimization is specifically tailored for two-stage configurations
2Stress or pressure
If the ratio of outlet area to inlet area is increased to greater than 60%, then the pressure ratio performance is improved, but the geometric constraints become more stringent
Solution Approach 1:
The patent implements parameter changes by specifying that the ratio of outlet area to inlet area shall be greater than 60%. This quantitative parameter modification directly improves pressure ratio performance while establishing a clear design criterion that guides manufacturing precision requirements
3Productivity
If the compressor wheel is designed with specific blade configurations, then the aerodynamic performance is improved, but the design complexity increases
Solution Approach 1:
The patent applies local quality by configuring specific blade characteristics at different locations on the compressor wheel. The blades are designed with particular geometric properties that optimize aerodynamic performance in specific regions of the wheel, allowing enhanced overall performance while managing design complexity through localized optimization
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
This optimized geometry enhances the performance of compressor wheels in two-stage supercharging systems and allows for effective operation in single-stage systems by achieving advantageous pressure ratios.
Implementation Method 1
the ratio between the inlet area and the outlet area of the compressor wheel according to the invention is set to values greater than 60%
Data Source
AI summary
A compressor wheel (1) of a compressor (6A) of an exhaust-gas turbocharger (6), having a hub (2); and having a multiplicity of non-recessed blades (3) which are arranged on the hub (2) and which have in each case a blade leading edge (3A) and a blade trailing edge (3B). The blade leading edges (3A) define an inlet area (A1) which is the area swept by the blade leading edges (3A) as the compressor wheel (1) rotates. The blade trailing edges (3B) define an outlet area (A2) which is the area swept by the blade trailing edges (3B) as the compressor wheel (1) rotates. The ratio A2/A1 is >60%.