Towards the Design of Synthetic-jet Actuators for Full-scale Flight Conditions |
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Authors: | Shan Zhong Mark Jabbal Hui Tang Luis Garcillan Fushui Guo Norman Wood Clyde Warsop |
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Institution: | (1) School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK;(2) BAE SYSTEMS, Bristol, UK |
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Abstract: | Despite the proven capability of synthetic-jet actuators in delaying boundary-layer separation in laboratory experiments,
a capability that allows the geometry and operating conditions of these devices to be designed and selected for maximum flow-control
effectiveness in full-scale flight conditions has yet to be developed. In this two-part paper, the key results obtained during
a 3-year research programme aiming at establishing such a capability based on a better understanding of the fluid mechanics
of synthetic jets and an improved modelling capacity are reported. In Part 1 of this paper, the experimental studies of the
behaviour of synthetic jets in both quiescent flow and a boundary layer are described. The work has led to an improved understanding
of the dimensionless parameters that determine the formation and development of vortex rollup and how the strength of rollup
can be enhanced by optimizing the geometry and operating condition. Based on the study of the nature of vortical structures
produced as the result of the interaction with a boundary layer and their impact in the near-wall region where flow control
is desired, the conditions for producing effective vortical structures for delaying flow separation were established. The
finding from this work forms the basis of a number of criteria used for designing synthetic jet actuators for full-scale flight
condition to be presented in Part 2. |
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Keywords: | Flow separation control Synthetic jet actuators |
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