Exhaust Muffler Tail Pipe Spiral Fins Ripple Suppression
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Solution Overview
Problem
Existing exhaust mufflers generate ripples when discharging exhaust gas, which interfere with the shock wave timing inside the chamber, hindering engine efficiency and fuel efficiency improvements.
Innovation Solution
An exhaust muffler design featuring a chamber with a tail pipe having spiral fins and diffusion holes on its side surface, which suppresses ripples and optimizes the discharge of exhaust gas, ensuring effective use of shock waves for improved engine output and fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If exhaust gas is discharged directly from the chamber to the atmosphere, then the discharge process is simple, but ripples are generated that interfere with shock wave timing and reduce engine efficiency
Solution Approach 1:
The exhaust discharge path is segmented into multiple functional zones: the expansion chamber for shock wave generation, the tail pipe for ripple suppression, and the fins for flow stabilization. This segmentation allows each component to perform its specific function optimally, preventing ripples from interfering with shock wave timing while maintaining engine efficiency.
Solution Approach 2:
The tail pipe acts as an intermediary component between the expansion chamber and the atmosphere. It mediates the transition of exhaust gas by suppressing ripples and stabilizing flow before discharge, thereby protecting the shock wave timing in the chamber while enabling efficient exhaust discharge.
2Use of energy by moving object
If a tail pipe with spiral fins is added to suppress ripples, then engine efficiency and fuel consumption improve, but the device complexity increases
Solution Approach 1:
Spiral fins with curved geometry are used in the tail pipe to generate rotational flow and suppress ripples. The curved structure creates a swirling motion that stabilizes the exhaust flow, preventing ripple formation while improving fuel consumption. This curvature-based approach is more effective than straight-line configurations for ripple suppression.
Solution Approach 2:
The spiral fins create periodic rotational motion in the exhaust flow as it passes through the tail pipe. This periodic action stabilizes the flow pattern and prevents irregular ripples from forming, thereby improving fuel efficiency while adding a relatively simple periodic structure to the system.
3Power
If diffusion holes are provided on the side surface of the tail pipe, then exhaust gas discharge is optimized and power increases, but manufacturing complexity increases
Solution Approach 1:
Diffusion holes are provided locally at specific positions on the side surface of the tail pipe rather than uniformly throughout. This local quality approach allows exhaust gas to be discharged at optimized locations, increasing engine power output while minimizing the number of holes required and reducing manufacturing complexity compared to a fully perforated structure.
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 increases power and torque values while reducing fuel consumption by effectively managing the discharge of exhaust gas, enhancing engine performance and efficiency.
Implementation Method 1
in which the plurality of fins 21 are disposed inside thereof in the spiral shape gradually widening toward the discharging direction of exhaust gas. Accordingly, the ripples generated when the exhaust gas is discharged from the outlet of the exhaust muffler to the atmosphere are suppressed
Implementation Method 2
When the exhaust gas reaches the chamber, the exhaust gas is expanded vigorously in the chamber. A shock wave generated when the expansion is generated is reflected inside the chamber and the air-fuel mixture drawn into the exhaust pipe is pushed back into the cylinder.
Implementation Method 3
the exhaust gas is expanded vigorously in the chamber
Data Source
Figure 1~2
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Figure 5~6
AI summary
An exhaust muffler with a tail pipe for suppressing ripples, increasing an engine output and improving fuel consumption efficiency is provided. A chamber 10 is provided in the middle of an exhaust pipe 1 for an internal combustion engine. A tail pipe 20 connected to an end portion of an exhaust opening of the exhaust pipe 1 is provided. A plurality of fins 21 are disposed inside the tail pipe 20 in a spiral shape that is gradually widened toward a discharging direction of the exhaust gas. The chamber 10 includes a cover body 11 and an internal exhaust pipe 12 surrounded by the cover body 11. The internal exhaust pipe 12 includes a diffusion exhaust pipe 13 having a wide bore and a compression exhaust pipe 14 having a narrow bore. Diffusion pores 15 are drilled on a portion of the side surface of the internal exhaust pipe 12.