Abstract
An instrumentation system for in-situ measurement of the inner-outer pressure differential at the upper and lower surfaces of dynamically inflatable wings is designed and tested, revealing important insights into the aerodynamic characteristics of inflatable airfoils. Wind tunnel tests demonstrated full capability of low-pressure differential readings in the range of 1.0–120 Pa, covering speeds from 3 to 10 m/s at angles of attack from −20 to +25°. Readings were stable, presenting coefficients of variation from 2% to 7% over the operational flight envelope. The experimental data confirmed the occurrence of a bottom leading-edge recirculation bubble, linked to the low Reynolds regime and the presence of an air intake. It supported the proposition of a novel approach to aerodynamic characterization based on local pressure differentials, which takes in account the confined airflow structure and provides lift forces estimations compatible with practical observation. The results were also compatible with data previously obtained following different strategies and were shown to be effective for parameterizing the inflation and stall phenomena. Overall, the instrumentation may be applied straightforwardly as a flight-test equipment, and it can be further converted into collapse alert and prevention systems.
Highlights
Application of paragliders, parafoils, and other dynamically inflatable wings (DIW)has increased drastically in the past thirty years [1,2,3]
Reynolds regime and the presence of an air intake. It supported the proposition of a novel approach to aerodynamic characterization based on local pressure differentials, which takes in account the confined airflow structure and provides lift forces estimations compatible with practical observation
◦ < angle of attack (AOA) < 15◦ ), the aerodynamic behavior follows the principles observed in rigid air(0 stall angles of attack
Summary
Application of paragliders, parafoils, and other dynamically inflatable wings (DIW)has increased drastically in the past thirty years [1,2,3]. Application of paragliders, parafoils, and other dynamically inflatable wings (DIW). In the 1960s, inflatable wings were began as deceleration systems, for which no performance or flight qualities aspects were relevant. Evolution turned flexible wings to be more similar to the conventional rigid counterpart, making them aerodynamically efficient, stable, and maneuverable, which are essential design requirements. Instead of merely assuring a softer landing, inflatable wings evolved into efficient, maneuverable air-sport vehicles. They were applied for dragging ships, running wind power generators, positioning military troops and cargo, and recovering launch vehicle parts.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
