Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry
Helicopter engines are often mounted atop the fuselage to keep the aircraft footprint small and optimal for operations. As a result, hot gases produced by the engines may inadvertently impinge upon the tail boom or dissipate inefficiently that compromises on operation safety. In this study, a scaled...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/155212 |
| _version_ | 1826126837794734080 |
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| author | Zhen, Wei Teo Wong, Wai Hou Lee, Zhi Wen New, Tze How Ng, Bing Feng |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Zhen, Wei Teo Wong, Wai Hou Lee, Zhi Wen New, Tze How Ng, Bing Feng |
| author_sort | Zhen, Wei Teo |
| collection | NTU |
| description | Helicopter engines are often mounted atop the fuselage to keep the aircraft footprint small and optimal for operations. As a result, hot gases produced by the engines may inadvertently impinge upon the tail boom or dissipate inefficiently that compromises on operation safety. In this study, a scaled fuselage model with a hot air blower was used to simulate hot exhaust gases. The velocity field immediately outside the exhaust port was measured through stereoscopic particle image velocimetry to capture the trajectory and flow behaviour of the gases. Two cases were considered: freestream to exhaust velocity ratios of 0 (no freestream velocity) and 0.46 (co-flowing free stream), respectively. The formation of a counter-rotating vortex pair was detected for both cases but were opposite in the rotational sense. For the case without freestream, the plume formed into a small “kidney” shape, before expanding and dissipating downstream. For the case with freestream, the plume formed into a slenderer and more elongated “reversed-C” shape as compared to the case without freestream. It also retained its shape further downstream and maintained its relative position. These observations on the trajectory and shape of plume provide basis to understanding the nature and interaction of the plume with its surroundings. |
| first_indexed | 2024-10-01T06:58:51Z |
| format | Journal Article |
| id | ntu-10356/155212 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:58:51Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1552122022-02-12T20:11:28Z Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry Zhen, Wei Teo Wong, Wai Hou Lee, Zhi Wen New, Tze How Ng, Bing Feng School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Aerodynamics Vortex Helicopter engines are often mounted atop the fuselage to keep the aircraft footprint small and optimal for operations. As a result, hot gases produced by the engines may inadvertently impinge upon the tail boom or dissipate inefficiently that compromises on operation safety. In this study, a scaled fuselage model with a hot air blower was used to simulate hot exhaust gases. The velocity field immediately outside the exhaust port was measured through stereoscopic particle image velocimetry to capture the trajectory and flow behaviour of the gases. Two cases were considered: freestream to exhaust velocity ratios of 0 (no freestream velocity) and 0.46 (co-flowing free stream), respectively. The formation of a counter-rotating vortex pair was detected for both cases but were opposite in the rotational sense. For the case without freestream, the plume formed into a small “kidney” shape, before expanding and dissipating downstream. For the case with freestream, the plume formed into a slenderer and more elongated “reversed-C” shape as compared to the case without freestream. It also retained its shape further downstream and maintained its relative position. These observations on the trajectory and shape of plume provide basis to understanding the nature and interaction of the plume with its surroundings. Accepted version This work was supported by Leonardo-Finmeccanica Helicopter division. 2022-02-10T07:42:22Z 2022-02-10T07:42:22Z 2021 Journal Article Zhen, W. T., Wong, W. H., Lee, Z. W., New, T. H. & Ng, B. F. (2021). Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 235(9), 1091-1104. https://dx.doi.org/10.1177/0954410020966471 0954-4100 https://hdl.handle.net/10356/155212 10.1177/0954410020966471 2-s2.0-85093975848 9 235 1091 1104 en Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering © 2020 The Author(s). All rights reserved. This paper was published by SAGE in Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering and is made available with permission of The Author(s). application/pdf |
| spellingShingle | Engineering::Mechanical engineering Aerodynamics Vortex Zhen, Wei Teo Wong, Wai Hou Lee, Zhi Wen New, Tze How Ng, Bing Feng Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry |
| title | Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry |
| title_full | Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry |
| title_fullStr | Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry |
| title_full_unstemmed | Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry |
| title_short | Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry |
| title_sort | characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry |
| topic | Engineering::Mechanical engineering Aerodynamics Vortex |
| url | https://hdl.handle.net/10356/155212 |
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