An Experimental Characterization on the Acoustic Performance of Forward/Rearward Retraction of a Nose Landing Gear
The modern undercarriage system of a large aircraft normally requires the landing gear to be retractable. The nose landing gear, installed in the front of the fuselage, is retracted either forward or rearward. In the forward/rearward retraction system, the landing gear is normally installed to the t...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | International Journal of Aerospace Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/4135094 |
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| author | Yong Liang Kun Zhao Yingchun Chen Longjun Zhang Gareth J. Bennett |
| author_facet | Yong Liang Kun Zhao Yingchun Chen Longjun Zhang Gareth J. Bennett |
| author_sort | Yong Liang |
| collection | DOAJ |
| description | The modern undercarriage system of a large aircraft normally requires the landing gear to be retractable. The nose landing gear, installed in the front of the fuselage, is retracted either forward or rearward. In the forward/rearward retraction system, the landing gear is normally installed to the trailing/leading side of the bay. When the incoming flow passes the landing gear as well as the bay, the installation that corresponds to the forward/rearward retraction system has a significant impact on the coupling flow and the associated noise of the landing gear and the bay. In this paper, acoustic performance of the forward/rearward retraction of the nose landing gear was discussed based on experiment. The landing gear bay was simplified as a rectangular cavity, and tests were conducted in an aeroacoustics wind tunnel. The cavity oscillation was first analyzed with different incoming speeds. Then, the landing gear model was installed close to the trailing and the leading side of the cavity, respectively. It was observed that installation close to the leading side can help disturb the shear layer so as to suppress the oscillation, while the trailing one can make the landing gear itself produce lower noise. Accordingly, conclusions on the acoustic performance of the forward/rearward retraction of the nose landing gear are made. |
| format | Article |
| id | doaj-art-7d8517f356f844bc9919bda7327efe44 |
| institution | Kabale University |
| issn | 1687-5966 1687-5974 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Aerospace Engineering |
| spelling | doaj-art-7d8517f356f844bc9919bda7327efe442025-02-03T01:28:40ZengWileyInternational Journal of Aerospace Engineering1687-59661687-59742019-01-01201910.1155/2019/41350944135094An Experimental Characterization on the Acoustic Performance of Forward/Rearward Retraction of a Nose Landing GearYong Liang0Kun Zhao1Yingchun Chen2Longjun Zhang3Gareth J. Bennett4School of Aeronautics, Northwestern Polytechnic University, Xi’an 710072, ChinaKey Laboratory of the Aerodynamic Noise Control, China Aerodynamics Research and Development Centre, Mianyang, Sichuan 612000, ChinaSchool of Aeronautics, Northwestern Polytechnic University, Xi’an 710072, ChinaSchool of Aeronautics, Northwestern Polytechnic University, Xi’an 710072, ChinaSchool of Engineering, Trinity College Dublin, University of Dublin, Dublin, D02PN40, IrelandThe modern undercarriage system of a large aircraft normally requires the landing gear to be retractable. The nose landing gear, installed in the front of the fuselage, is retracted either forward or rearward. In the forward/rearward retraction system, the landing gear is normally installed to the trailing/leading side of the bay. When the incoming flow passes the landing gear as well as the bay, the installation that corresponds to the forward/rearward retraction system has a significant impact on the coupling flow and the associated noise of the landing gear and the bay. In this paper, acoustic performance of the forward/rearward retraction of the nose landing gear was discussed based on experiment. The landing gear bay was simplified as a rectangular cavity, and tests were conducted in an aeroacoustics wind tunnel. The cavity oscillation was first analyzed with different incoming speeds. Then, the landing gear model was installed close to the trailing and the leading side of the cavity, respectively. It was observed that installation close to the leading side can help disturb the shear layer so as to suppress the oscillation, while the trailing one can make the landing gear itself produce lower noise. Accordingly, conclusions on the acoustic performance of the forward/rearward retraction of the nose landing gear are made.http://dx.doi.org/10.1155/2019/4135094 |
| spellingShingle | Yong Liang Kun Zhao Yingchun Chen Longjun Zhang Gareth J. Bennett An Experimental Characterization on the Acoustic Performance of Forward/Rearward Retraction of a Nose Landing Gear International Journal of Aerospace Engineering |
| title | An Experimental Characterization on the Acoustic Performance of Forward/Rearward Retraction of a Nose Landing Gear |
| title_full | An Experimental Characterization on the Acoustic Performance of Forward/Rearward Retraction of a Nose Landing Gear |
| title_fullStr | An Experimental Characterization on the Acoustic Performance of Forward/Rearward Retraction of a Nose Landing Gear |
| title_full_unstemmed | An Experimental Characterization on the Acoustic Performance of Forward/Rearward Retraction of a Nose Landing Gear |
| title_short | An Experimental Characterization on the Acoustic Performance of Forward/Rearward Retraction of a Nose Landing Gear |
| title_sort | experimental characterization on the acoustic performance of forward rearward retraction of a nose landing gear |
| url | http://dx.doi.org/10.1155/2019/4135094 |
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