Active flow control for helicopter fuselage drag reduction
http://www.cleansky.eu/content/inter...drag-reduction
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Figure 3 : Fuselage model backdoor with the 8 spaces for the removable actuators
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Significant drag reductions were observed for the 3 different types of actuations tested. A wide parametric study allowed most promising control scheme to be identified. It was in particular demonstrated that such drag reductions were achievable for a wide range of angles of attack by combining several control schemes.
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Page one describing the active air flow/sucking used.
https://vtol.org/store/product/helic...ation-8698.cfm
https://vtol.org/store/product/helic...ation-8698.cfm