Investigation on the influence of airflow on the acoustic performance of a single–Cylinder diesel engine exhaust muffler
Jun Fu, Milan Cheng, Yi Ma, Wei Zheng, Muhammad Shakaib, Muhammad Shakaib, Muhammad Shakaib
TL;DR
This study examines how airflow affects the noise reduction performance of a diesel engine muffler, finding significant improvements in low-frequency sound reduction.
Contribution
The study introduces a validated simulation method to analyze airflow's impact on muffler acoustic performance, particularly in low-frequency ranges.
Findings
Airflow increases muffler transmission loss by up to 50 dB in the low-frequency range (0–2000 Hz).
Fluid flow significantly improves acoustic performance, especially below 1000 Hz.
Airflow has minimal impact on medium-high frequency (2000–7000 Hz) transmission loss.
Abstract
The airflow in the exhaust muffler can affect the sound propagation characteristics. In this work, For a single-cylinder diesel engine, an experimental bench was set up, and the accuracy of the simulation model was verified through the mutual comparison between the experimental data and the simulation results. the transmission loss of exhaust muffler of a single-cylinder diesel engine is analyzed numerically. In addition, the influence of airflow on the acoustic performance of muffler is studied and analyzed in detail. Finally, a finite element method, namely automatic matched layer (AML) is used to simulate the anechoic boundary conditions, and the value of transmission loss of muffler with and without airflow is calculated. Results demonstrate that: Considering the influence of airflow, the transmission loss value of the muffler shows the obvious increase in the low-frequency domain…
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Taxonomy
TopicsAcoustic Wave Phenomena Research · Aerodynamics and Acoustics in Jet Flows · Vehicle Noise and Vibration Control