Tail Pipe Resonance Chamber for Exhaust Noise Reduction
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Solution Overview
Problem
Existing tail pipes in exhaust systems improve exhaust efficiency but fail to effectively reduce noise generated by air flow during exhaust gas discharge.
Innovation Solution
A tail pipe design featuring an inner tube with an enlarged diameter portion and communication holes, where the outer tube forms a resonance chamber to reduce noise through flow velocity management and turbulence inhibition, utilizing a combination of gently and sharply enlarged portions and strategically placed communication holes to facilitate uniform gas mixture and minimize turbulent flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grooves are formed spirally on the peripheral wall to increase exhaust efficiency, then exhaust flow velocity is increased, but noise reduction effect cannot be obtained
Solution Approach 1:
The tail pipe is divided into an inner tube and an outer tube, creating a dual-structure system. The inner tube handles exhaust flow with spiral grooves for efficiency, while the outer tube provides a separate resonance chamber for noise reduction, allowing both functions to operate independently and simultaneously
Solution Approach 2:
The invention merges the exhaust efficiency function (inner tube with spiral grooves) and noise reduction function (outer tube resonance chamber) into a single integrated tail pipe assembly. The communication holes connect the two functional zones, enabling both high exhaust efficiency and effective noise suppression in one device
2Object-generated harmful factors
If the inner tube is enlarged in diameter toward the discharge port to reduce flow velocity and facilitate rapid mixture, then air flow noise is reduced, but the structural complexity increases
Solution Approach 1:
The inner tube features a curved, enlarged diameter portion toward the discharge port instead of a straight cylindrical shape. This curved geometry naturally reduces flow velocity and promotes uniform mixing of exhaust gases with atmospheric air, while the smooth curvature minimizes turbulence and associated noise
Solution Approach 2:
The inner tube with enlarged diameter is nested within the outer tube, creating a compact dual-structure. The communication holes penetrate through the outer tube wall to connect the inner tube's discharge port area with the outer tube's resonance chamber, integrating multiple functions in a space-efficient manner
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 design achieves a significant reduction in air flow noise by creating a resonance chamber and managing flow velocities, resulting in a rapid and uniform mixture of exhaust gases into the atmosphere, thereby enhancing the silencing effect at the discharge port.
Implementation Method 1
the space inside the outer tube communicating with the interior of the inner tube to function as a resonance chamber. This results in obtaining a silencing effect at the discharge port due to a resonance effect in the space
Implementation Method 2
a flow velocity of the exhaust gas is reduced by the enlarged diameter portion. This facilitates rapid and uniform mixture of the exhaust gas into the atmosphere
Data Source
AI summary
Provided is a tail pipe in which a silencing effect at a discharge port is obtained. One aspect of the present disclosure is a tail pipe including: an inner tube including a discharge port configured such that an exhaust gas is discharged therefrom; an outer tube arranged so as to form a space between the outer tube and the inner tube by surrounding an outer peripheral surface of the inner tube, an upstream end of the outer tube in a flow direction of the exhaust gas being closed; and at least one communication hole allowing communication between an interior of the inner tube and the space.