|Title:||Subsonic indicial aerodynamics for unsteady loads calculation via numerical and analytical methods : a preliminary assessment : AIAA 2015-3170|
|Authors :||Da Ronch, Andrea|
|Proceedings:||Proceedings of the 33rd Applied Aerodynamics Conference : Unsteady Flows|
|Conference details:||33rd AIAA Applied Aerodynamics Conference, Dallas, USA, 22-26 June 2015|
|Publisher / Ed. Institution :||AIAA AVIATION Forum|
|License (according to publishing contract) :||Licence according to publishing contract|
|Type of review:||Not specified|
|Subject (DDC) :||620: Engineering|
|Abstract:||This study deals with generating aerodynamic indicial-admittance functions for the unsteady loads of aircraft wings via CFD and approximate analytical formulations. The novel aspects concern both a critical analysis of the CFD simulations process and an effective analytical synthesis of the CFD outcome based on sound physical grounds, where the main factors affecting the results’ accuracy are separately considered for both impulsive and circulatory parts of the flow response. Considering both thin aerofoils and elliptical wings in compressible subsonic flow, the first part of this work aims at understanding the best practice of generating aerodynamic indicial functions via CFD and numerical results of the lift build-up are obtained for several Mach numbers and aspect ratios. The second part of this work aims at investigating convenient semi-analytical means of approximating such aerodynamic indicial functions by modifying those available for incompressible flow, taking advantage of Prandtl-Glauert scalability for the circulatory part and piston theory for the non-circulatory part. Suitable tuning of the analytical expressions is also derived in order to mimic the CFD results and make proper comparisons between the two approaches. Results are finally shown and critically addressed with respect to the physical and mathematical assumptions employed for the aerodynamic load calculations, within a rigorous and consistent framework. Especially in the case of thin aerofoils, the correct limit behaviour and excellent agreement found between numerical and (tuned) analytical results (i) validate both, (ii) identify the best practice in setting up the CFD simulations and (iii) demonstrate the accuracy and robustness of the proposed analytical technique for approximating aerodynamic indicial-admittance functions efficiently.|
|Departement:||School of Engineering|
|Organisational Unit:||Institute of Mechanical Systems (IMES)|
|Publication type:||Conference Paper|
|Appears in Collections:||Publikationen School of Engineering|
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