Evaluation of a Microporous Acoustic Liner Using Advanced Noise Control Fan Engine
A novel microstructurally controlled graded micro-porous material was developed and experimentally validated for noise reduction through a normal incidence impedance test. Extensive parametric studies were conducted to understand the influence of test specimen size, particle size, porosity, pore siz...
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MDPI AG
2025-04-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/15/9/4734 |
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| author | Bharath Kenchappa Kunigal Shivakumar |
| author_facet | Bharath Kenchappa Kunigal Shivakumar |
| author_sort | Bharath Kenchappa |
| collection | DOAJ |
| description | A novel microstructurally controlled graded micro-porous material was developed and experimentally validated for noise reduction through a normal incidence impedance test. Extensive parametric studies were conducted to understand the influence of test specimen size, particle size, porosity, pore size, and its distribution on acoustic absorption and transmission loss. Based on previous research, this study evaluates the application of graded microporous material as an acoustic liner technology for aircraft turbomachine engines. The liner was fabricated in eight 45° segments, assembled in an aluminum test rig, and tested on NASA Glenn Research Center’s Advanced Noise Control Fan (ANCF) low-speed test bed for tonal and broadband noise. The study demonstrates that microstructurally controlled graded microporous material is very effective in dissipating sound energy with reductions in tonal sound pressure level (SPL) of 2 to 13 dB at blade passing frequencies and reductions in broadband SPL of about 2 to 3 dB for the shaft order greater than 40. While the proposed two-layer graded liner model successfully validated the concept, additional design optimization is needed to enhance performance further. This work highlights the potential of graded microporous material as next-generation acoustic liners, offering lightweight, efficient, and scalable aircraft engine noise reduction solutions. |
| format | Article |
| id | doaj-art-e52e5f1f29674483bbdf6ea1c149020b |
| institution | OA Journals |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-e52e5f1f29674483bbdf6ea1c149020b2025-08-20T02:24:47ZengMDPI AGApplied Sciences2076-34172025-04-01159473410.3390/app15094734Evaluation of a Microporous Acoustic Liner Using Advanced Noise Control Fan EngineBharath Kenchappa0Kunigal Shivakumar1Department of Mechanical Engineering, North Carolina Agricultural & Technical State University, 1601, E Market St, Greensboro, NC 27411, USADepartment of Mechanical Engineering, North Carolina Agricultural & Technical State University, 1601, E Market St, Greensboro, NC 27411, USAA novel microstructurally controlled graded micro-porous material was developed and experimentally validated for noise reduction through a normal incidence impedance test. Extensive parametric studies were conducted to understand the influence of test specimen size, particle size, porosity, pore size, and its distribution on acoustic absorption and transmission loss. Based on previous research, this study evaluates the application of graded microporous material as an acoustic liner technology for aircraft turbomachine engines. The liner was fabricated in eight 45° segments, assembled in an aluminum test rig, and tested on NASA Glenn Research Center’s Advanced Noise Control Fan (ANCF) low-speed test bed for tonal and broadband noise. The study demonstrates that microstructurally controlled graded microporous material is very effective in dissipating sound energy with reductions in tonal sound pressure level (SPL) of 2 to 13 dB at blade passing frequencies and reductions in broadband SPL of about 2 to 3 dB for the shaft order greater than 40. While the proposed two-layer graded liner model successfully validated the concept, additional design optimization is needed to enhance performance further. This work highlights the potential of graded microporous material as next-generation acoustic liners, offering lightweight, efficient, and scalable aircraft engine noise reduction solutions.https://www.mdpi.com/2076-3417/15/9/4734graded microporous materialacoustic linernoise mitigation technologyaircraft engine noise reductiontonal and broadband noise reductionNASA GRC acoustic tests |
| spellingShingle | Bharath Kenchappa Kunigal Shivakumar Evaluation of a Microporous Acoustic Liner Using Advanced Noise Control Fan Engine Applied Sciences graded microporous material acoustic liner noise mitigation technology aircraft engine noise reduction tonal and broadband noise reduction NASA GRC acoustic tests |
| title | Evaluation of a Microporous Acoustic Liner Using Advanced Noise Control Fan Engine |
| title_full | Evaluation of a Microporous Acoustic Liner Using Advanced Noise Control Fan Engine |
| title_fullStr | Evaluation of a Microporous Acoustic Liner Using Advanced Noise Control Fan Engine |
| title_full_unstemmed | Evaluation of a Microporous Acoustic Liner Using Advanced Noise Control Fan Engine |
| title_short | Evaluation of a Microporous Acoustic Liner Using Advanced Noise Control Fan Engine |
| title_sort | evaluation of a microporous acoustic liner using advanced noise control fan engine |
| topic | graded microporous material acoustic liner noise mitigation technology aircraft engine noise reduction tonal and broadband noise reduction NASA GRC acoustic tests |
| url | https://www.mdpi.com/2076-3417/15/9/4734 |
| work_keys_str_mv | AT bharathkenchappa evaluationofamicroporousacousticlinerusingadvancednoisecontrolfanengine AT kunigalshivakumar evaluationofamicroporousacousticlinerusingadvancednoisecontrolfanengine |