Compressor Exhaust Gas Supply Channel Segmentation
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Solution Overview
Problem
The conventional T-junction configuration in LP-EGR systems leads to a non-uniform flow field, resulting in a drop in compressor performance, efficiency, and increased risk of water condensation causing erosion of compressor blades.
Innovation Solution
A system comprising a main channel that receives air and exhaust gas separately, with an exhaust gas supply arrangement featuring at least two separate exhaust gas supply channels that inject exhaust gas into the air flow in a multiple discrete and circumferentially distributed manner, reducing mixing disturbances and promoting uniform flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a T-junction configuration is used to mix exhaust gas with air, then exhaust gas recirculation is achieved, but a non-uniform flow field is created causing compressor performance drop
Solution Approach 1:
The single exhaust gas supply channel is segmented into multiple separate channels (at least two) that are distributed circumferentially around the main channel. This segmentation allows exhaust gas to be injected at multiple discrete positions, creating a more uniform flow field and reducing mixing disturbances that would otherwise harm compressor performance.
Solution Approach 2:
Different regions of the main channel receive exhaust gas injections at different circumferential positions through the separate supply channels. This local distribution strategy ensures that the flow field quality varies optimally across different sections, maintaining uniformity overall while enabling effective exhaust gas recirculation in specific zones without compromising compressor performance.
2Adaptability or versatility
If exhaust gas is injected into air flow, then exhaust gas recirculation is achieved, but mixing disturbances reduce flow uniformity
Solution Approach 1:
The exhaust gas injection system is divided into multiple separate channels distributed around the main channel. This segmentation distributes the mixing process across multiple locations, preventing large-scale flow disturbances and maintaining overall flow field uniformity while still achieving effective exhaust gas recirculation.
Solution Approach 2:
The exhaust gas supply channels are arranged circumferentially around the main channel, adding a circumferential dimension to the injection pattern. This spatial distribution in multiple dimensions ensures that exhaust gas is injected uniformly around the flow, minimizing disturbances and maintaining flow field stability.
3Adaptability or versatility
If mixing of exhaust gas and air occurs, then exhaust gas recirculation is achieved, but water condensation increases causing blade erosion
Solution Approach 1:
By segmenting the exhaust gas supply into multiple separate channels distributed circumferentially, the mixing process is distributed and controlled. This prevents localized regions of excessive mixing that would cause rapid cooling and water condensation, thereby reducing the harmful effect of blade erosion while maintaining exhaust gas recirculation benefits.
Solution Approach 2:
The separate circumferentially distributed channels create localized injection zones that control the mixing rate and thermal gradients. This local control prevents excessive cooling in any single region, reducing water condensation formation and the associated blade erosion risk, while still achieving overall exhaust gas recirculation.
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 configuration minimizes the reduction in compressor performance, maintains low condensation impact, and enhances the uniformity of the flow, thereby improving compressor efficiency and reducing the risk of blade erosion.
Implementation Method 1
injecting the exhaust gas in the air flow in a multiple discrete and circumferentially distributed manner, reducing mixing disturbances and promoting uniform flow
Data Source
AI summary
In the technical field of compressors, a system that is configured to supply a mixture of air and exhaust gas to a compressor wheel of a compressor is provided. The system comprises a main channel that is configured to debouch into an area where the compressor wheel is located at an outlet end thereof, to receive a supply of air in a first section thereof, and to receive a supply of exhaust gas further downstream in a second section thereof, and an exhaust gas supply arrangement that is connected to the main channel at the position of the second section. The exhaust gas supply arrangement is designed as a distributor comprising at least two exhaust gas supply channels which are separate from each other along at least a substantial part of their length.