Compressor Recirculation Valve Noise-Suppressing Muffler
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Solution Overview
Problem
Recirculation valves in turbochargers generate aerodynamically induced noise due to the recirculation of compressed air, which is not effectively mitigated by existing designs.
Innovation Solution
A double-walled muffler is integrated around the recirculation valve, featuring a non-perforated inner wall and a perforated outer wall, constraining compressed air to flow along the inner wall before exiting through the outer wall, thereby reducing noise through velocity reduction and redirection into a transverse flow passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recirculation valve is used to recirculate compressed air back to the compressor inlet, then the onset of surge is delayed to a lower flow rate or higher pressure ratio, but aerodynamically induced noise is generated
Solution Approach 1:
A muffler is introduced as an intermediary component between the recirculation valve and the compressor inlet. The muffler includes a housing with a liner that creates an annular passage, forcing the recirculated air to flow through this intermediate structure rather than directly into the compressor, thereby reducing noise generation
Solution Approach 2:
The muffler design transforms the one-dimensional direct axial flow path into a two-dimensional annular flow path by introducing the liner and creating an annular passage. This dimensional change forces the air to travel along the liner surface, reducing flow velocity and minimizing aerodynamic noise
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
The solution significantly reduces noise levels associated with the recirculation valve operation by controlling airflow patterns, providing a quieter operation compared to conventional designs without the muffler.
Implementation Method 1
a generally cylindrical, perforated outer wall extending axially from the flange and terminating at an opposite second end of the body
Data Source
AI summary
A compressor recirculation valve having a noise-suppressing muffler. The muffler has a double-walled construction, including a perforated outer wall and a non-perforated inner wall. The muffler is arranged surrounding the RCV such that when the RCV valve member is in an open position, compressed recirculation air is constrained to flow along the non-perforated inner wall and past an upper end thereof before reaching and flowing radially outwardly through the perforated outer wall to a transverse flow passage for delivery back into an inlet of the compressor.