Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/155212
Title: Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry
Authors: Zhen, Wei Teo
Wong, Wai Hou
Lee, Zhi Wen
New, Tze How
Ng, Bing Feng
Keywords: Engineering::Mechanical engineering
Issue Date: 2021
Source: 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
Journal: Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 
Abstract: 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.
URI: https://hdl.handle.net/10356/155212
ISSN: 0954-4100
DOI: 10.1177/0954410020966471
Rights: © 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).
Fulltext Permission: open
Fulltext Availability: With Fulltext
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