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| Design of Compound Small-hole Muffler Based on Small-hole Injection Theory |
| Received:December 04, 2019 Revised:December 11, 2019 |
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| DOI：10.7643/issn.1672-9242.2020.06.002 |
| KeyWord:acoustics noise reduction small-hole injection theory muffler |
| Author | Institution |
| LI Dong-mei |
Aircraft Strength Research Institute, Xi’an , China |
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| Abstract: |
| The paper aims to reduce the high-temperature and high-speed exhaust noise generated by the air radiator performance test bench pipeline in the ECS system for a certain type of aircraft. According to the theory of small-hole injection control noise, a composite small-hole muffler composed of a 4-layer perforated sound absorption structure was designed. Through experimental measurement, the noise sound pressure was reduced by 35 dB(A). This design of muffler eliminates the high-frequency blocking noise generated by the critical orifice plate and reduces the total sound pressure level of the noise. It has significant effect of noise reduction and can provide a reference for reduction of airflow noise in similar pipelines. |
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