Gust enhancement using jet at the trailing edge of a pair of pitching foils

Gupta, D and Arakeri, JH (2021) Gust enhancement using jet at the trailing edge of a pair of pitching foils. In: Sadhana - Academy Proceedings in Engineering Sciences, 46 (3).

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Abstract

A fluid dynamics numerical simulation is carried to study the gust characteristics produced downstream of a pair of sinusoidally pitching two-dimensional thin foils with a certain lateral spacing and placed in a freestream flow. The flow was simulated for Reynolds number (Re) = 1.6 � 105, the airfoil pitching angle = 6.9°, and a range of reduced frequencies (0.54 � k � 1.2). Between the two (undulating) wakes of the two foils, the flow is irrotational and unsteady that can be used to study gust response of, for example, micro-air vehicles (MAVS). The maximum gust velocity that can be generated by this technique is, however, limited to (5�7) of the mean flow velocity. To enhance the gust intensity, a new method is proposed: introduction of a jet at the trailing edge of each pitching foil. Results show that the addition of the trailing jet enhances the gust intensity by 2�7 times for the Re, jet velocity, and the range of reduced frequencies considered. This technique provides a simple, economical, and controlled way to study gust response of MAVs and aircraft in wind tunnels. © 2021, Indian Academy of Sciences.

Item Type:	Journal Article
Publication:	Sadhana - Academy Proceedings in Engineering Sciences
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer
Keywords:	Flow velocity; Reynolds number, Free-stream flow; Gust intensity; Jet velocities; Mean flow velocities; Pitching angle; Pitching foil; Reduced frequency; Trailing edges, Micro air vehicle (MAV)
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	07 Oct 2021 15:55
Last Modified:	07 Oct 2021 15:55
URI:	http://eprints.iisc.ac.in/id/eprint/69655

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