Centrifugal Compressor Bypass Curved Wall Noise Reduction
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Solution Overview
Problem
Noise is generated in centrifugal compressors with bypass flow paths due to backflow from the impeller side at the connection portion between the compressor inlet flow path and the bypass flow path.
Innovation Solution
The centrifugal compressor design includes a bypass flow path with an outlet cross-section where the first area wall surface portion is composed of a curve, eliminating linear portions that can cause vortex generation and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a bypass flow path is provided in the centrifugal compressor, then discharge pressure can be controlled by preventing excessive increase, but noise is generated at the connection portion between the compressor inlet flow path and the bypass flow path due to backflow from the impeller side
Solution Approach 1:
The first area wall surface portion of the bypass flow path outlet cross section is configured with a curved surface instead of a flat or angular surface. This curvature design guides the backflow smoothly along the curve, preventing vortex formation and reducing noise generation at the connection portion between the compressor inlet flow path and bypass flow path.
2Object-generated harmful factors
If the bypass flow path connection area is increased to reduce noise, then the flow path width must be increased, but this increases the overall device size
Solution Approach 1:
The curved surface configuration is applied specifically to the first area wall surface portion where backflow occurs, concentrating the noise reduction effect in the critical region. This localized design achieves noise control without requiring an overall increase in flow path width or device size.
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 design stabilizes the flow and reduces noise at the connection portion between the compressor inlet flow path and the bypass flow path, while also maintaining a required flow path area without increasing width, thus suppressing cavity flow and noise generation.
Implementation Method 1
at least the first area wall surface portion of the flow path wall surface of the bypass flow path at the outlet cross section is composed of a curve
Data Source
AI summary
In this centrifugal compressor, when a passage cross-section of a bypass passage at a connection point where the bypass passage and a compressor inlet passage are connected to each other is defined as an outlet cross-section of the bypass passage, a range of the outlet cross-section on the downstream side of the center of the outlet cross-section in the axial direction of an impeller and on the upstream side of the center in the rotation direction of the impeller is defined as a first range, and a portion of a passage wall surface of the bypass passage at the outlet cross-section that belongs to the first range is defined as a first-range wall surface portion, at least the first-range wall surface portion of the passage wall surface of the bypass passage at the outlet cross-section is formed from a curved line.