FLOW PHYSICS AND CONTROL OF 3-D SEPARATION ON 3-D SWEPT WINGS
Abstract
A closely coupled theoretical/numerical/experimental fundamental research is proposed, aiming atunderstanding and characterizing the formation mechanisms of large-scale 3-D separation structures on finite span swept wings, and their evolution as a function of several geometrical and flow parameters. The proposed effort is expected to clarify and classify the origins of unsteadiness of 3-D separation structures on swept wings, and to motivate physics-based flow control methodologies to alleviate adverse wing performance effects associated with the appearance of these structures. The essentially inhomogeneous nature of 3-D separated pockets requires application of state-of-the-art linear TriGlobal analysis, which will be complemented by local linear theory of 3-D separated boundary layer profiles, to correlate results of the two methodologies. Mean flows will be generated by LES, which will also deliver results to compare with linear local and global theory analysis predictions. The numerical effort will comprise of DNS and LES of the 3-D separated flow to provide insights into the emergence of these structures. The flowfields obtained for the high fidelity simulation will also serve as base states for the stability analysis and will be closely examined with the experimental results. The experimental thrust will include a study of a parametric space exploring the conditions and mechanisms responsible for the formation of 3-D structures. Experiments at low Reynolds numbers will be performed to cross-verify experimental, theoretical and numerical predictions. These experiments will be followed by testing at higher, more realistic, Reynolds numbers, focusing on the validation of the theoretical predictions, and apply appropriate flow control methodology to mitigate the structures. The coordinated investigations will provide a maximum coverage of the targeted parameter space to achieve an enhanced physical understanding of 3-D separation and effective control strategy.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 09, 2018
- Source ID
- FA95501710222
Entities
People
- Michael Amitay
Organizations
- Air Force Office of Scientific Research
- Rensselaer Polytechnic Institute
- United States Air Force