Turbocharger Compressor Noise Reduction via Flow Disruption
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Solution Overview
Problem
Existing turbocharger compressor systems fail to effectively reduce whoosh noise, which is characterized by broadband frequency noise and blade pass frequency noise, due to inadequate investigation of the compressor fluid flow path and insufficient targeting of these noise sources.
Innovation Solution
The system incorporates a compressor with a casing, a flow passage, a compressor wheel, a resonance chamber, and apertures that disrupt the flow path by changing the cross-sectional area at the leading edge of the main blades, specifically designed to target the broadband frequency range of whoosh noise, using a combination of a flow disrupting feature and apertures to reduce noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If small channels are provided to disturb the boundary layer of incoming fluid flow, then noise is reduced, but the fluid flow field is adversely affected
Solution Approach 1:
The invention applies local quality by providing flow disrupting features at specific locations within the compressor housing - particularly at the leading edge of the impeller and in the volute region - rather than uniformly throughout the entire flow path. This localized approach disrupts noise-generating flow patterns while preserving the overall fluid flow field and compressor performance.
2Object-affected harmful factors
If re-circulation passages are provided to recirculate fluid from downstream to upstream, then compressor noise is reduced, but the system complexity increases
Solution Approach 1:
The invention extracts and eliminates the need for complex re-circulation passages by using simpler flow disrupting features and acoustic treatment materials directly within the existing compressor housing structure. This approach achieves noise reduction without adding the complexity of separate recirculation systems.
Solution Approach 2:
The invention introduces acoustic treatment materials as an intermediary element within the compressor housing that absorbs and dampens noise-generating flow patterns. This intermediary approach reduces noise without requiring complex fluid re-circulation pathways.
3Object-affected harmful factors
If the flow path cross-sectional area is changed at the leading edge of main blades, then whoosh noise is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The invention applies parameter changes by modifying the cross-sectional area of the flow path at the leading edge of the impeller blades through defined geometric parameters (such as the angle and depth of the flow disrupting feature). These parameter changes are designed to reduce whoosh noise while maintaining manufacturability through standardized geometric features.
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 effectively reduces the noise level produced by the compressor by disrupting the airflow and addressing the specific frequency ranges associated with whoosh noise, providing a more significant noise reduction than previous approaches.
Implementation Method 1
a resonance chamber formed within the casing, surrounding the flow passage
Implementation Method 2
This configuration effectively reduces the noise level produced by the compressor by disrupting the airflow and addressing the specific frequency ranges associated with whoosh noise
Data Source
AI summary
Methods and systems are provided for a compressor of a turbocharger of an engine. In one example, a compressor may include a flow passage and a resonance chamber surrounding the flow passage, with the flow passage fluidly coupled with the resonance chamber by a recirculation passage, a bleed passage, and a plurality of apertures positioned between the recirculation passage and the bleed passage. Flowing fluid from the resonance chamber, through the apertures, and into the flow passage may reduce a noise level of the compressor.