Effect of inlet distortion with crosswind on aircraft-engine intake aerodynamic performance
This paper describes an experimental study on inlet distortion in the flow ingested to an intake of a ducted fan. Recent high bypass ratio engines tend to shorten the nacelle length for better fuel consumption. In return, the shorter the nacelle intake, the more intensive the inlet distortion inside...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2022-06-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/88/910/88_21-00357/_pdf/-char/en |
| _version_ | 1811225113188630528 |
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| author | Hiroki NARUSE Tatsuya ISHII Hideshi OINUMA Shinya KUSUDA Yoshinori OOBA Karin HIRAKAWA Hikaru AONO Hitoshi ISHIKAWA |
| author_facet | Hiroki NARUSE Tatsuya ISHII Hideshi OINUMA Shinya KUSUDA Yoshinori OOBA Karin HIRAKAWA Hikaru AONO Hitoshi ISHIKAWA |
| author_sort | Hiroki NARUSE |
| collection | DOAJ |
| description | This paper describes an experimental study on inlet distortion in the flow ingested to an intake of a ducted fan. Recent high bypass ratio engines tend to shorten the nacelle length for better fuel consumption. In return, the shorter the nacelle intake, the more intensive the inlet distortion inside the intake, which leads to deteriorating fan aerodynamic performance and intensifying the fan noise. This study aims at understanding the influence of intake geometries on the distortion ingested to a ducted fan and thus the fan noise caused by the interaction of the distortion with the fan blades. A subscale fan (fan simulator) coupled with intake models were used in the experiment. The intake models with different axial lengths were prepared to compare the distortion in front of the fan. One is a nominal intake as a reference. The other intake has a short non-dimensional distance from the lip to the fan surface. Crosswind conditions were imposed to realize a clearer influence of the distortion on the acoustic and aerodynamic parameters. According to the experimental results, the intake models provided a distinct increase in sound pressure levels inside the intake. It is anticipated that the sound amplification is attributed to the distortion associated with the intake lip geometry, intake length, and crosswind speed. Non-dimensional total pressure distribution revealed the high correlation between the fan noise and the inlet distortion. |
| first_indexed | 2024-04-12T09:00:24Z |
| format | Article |
| id | doaj.art-33eed8b20474458dbf9ab9fcbf613eea |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-12T09:00:24Z |
| publishDate | 2022-06-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-33eed8b20474458dbf9ab9fcbf613eea2022-12-22T03:39:15ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612022-06-018891021-0035721-0035710.1299/transjsme.21-00357transjsmeEffect of inlet distortion with crosswind on aircraft-engine intake aerodynamic performanceHiroki NARUSE0Tatsuya ISHII1Hideshi OINUMA2Shinya KUSUDA3Yoshinori OOBA4Karin HIRAKAWA5Hikaru AONO6Hitoshi ISHIKAWA7Department of Mechanical Engineering, Graduate School of Engineering, Tokyo University of ScienceJapan Aerospace Exploration AgencyJapan Aerospace Exploration AgencyIHI CorporationIHI CorporationIHI CorporationDepartment of Mechanical Engineering and Robotics, Shinshu UniversityDepartment of Mechanical Engineering, Tokyo University of ScienceThis paper describes an experimental study on inlet distortion in the flow ingested to an intake of a ducted fan. Recent high bypass ratio engines tend to shorten the nacelle length for better fuel consumption. In return, the shorter the nacelle intake, the more intensive the inlet distortion inside the intake, which leads to deteriorating fan aerodynamic performance and intensifying the fan noise. This study aims at understanding the influence of intake geometries on the distortion ingested to a ducted fan and thus the fan noise caused by the interaction of the distortion with the fan blades. A subscale fan (fan simulator) coupled with intake models were used in the experiment. The intake models with different axial lengths were prepared to compare the distortion in front of the fan. One is a nominal intake as a reference. The other intake has a short non-dimensional distance from the lip to the fan surface. Crosswind conditions were imposed to realize a clearer influence of the distortion on the acoustic and aerodynamic parameters. According to the experimental results, the intake models provided a distinct increase in sound pressure levels inside the intake. It is anticipated that the sound amplification is attributed to the distortion associated with the intake lip geometry, intake length, and crosswind speed. Non-dimensional total pressure distribution revealed the high correlation between the fan noise and the inlet distortion.https://www.jstage.jst.go.jp/article/transjsme/88/910/88_21-00357/_pdf/-char/enturbofan enginefan noisenacelleshort intakeinlet distortioncrosswindpressure |
| spellingShingle | Hiroki NARUSE Tatsuya ISHII Hideshi OINUMA Shinya KUSUDA Yoshinori OOBA Karin HIRAKAWA Hikaru AONO Hitoshi ISHIKAWA Effect of inlet distortion with crosswind on aircraft-engine intake aerodynamic performance Nihon Kikai Gakkai ronbunshu turbofan engine fan noise nacelle short intake inlet distortion crosswind pressure |
| title | Effect of inlet distortion with crosswind on aircraft-engine intake aerodynamic performance |
| title_full | Effect of inlet distortion with crosswind on aircraft-engine intake aerodynamic performance |
| title_fullStr | Effect of inlet distortion with crosswind on aircraft-engine intake aerodynamic performance |
| title_full_unstemmed | Effect of inlet distortion with crosswind on aircraft-engine intake aerodynamic performance |
| title_short | Effect of inlet distortion with crosswind on aircraft-engine intake aerodynamic performance |
| title_sort | effect of inlet distortion with crosswind on aircraft engine intake aerodynamic performance |
| topic | turbofan engine fan noise nacelle short intake inlet distortion crosswind pressure |
| url | https://www.jstage.jst.go.jp/article/transjsme/88/910/88_21-00357/_pdf/-char/en |
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