Transition Prediction and Control for Blunt Hypersonic Configurations with Hemispherical and Ogival Nosetips
Abstract
Performer proposes a computational investigation into the physical mechanisms that lead to the onset of boundary layer transition (BLT) within the swallowing distance of the entropy layer on slender hypersonic vehicles with blunt, hemispherical or ogival nosetips, such as the U.S. Navys Hyper Velocity Projectile (HVP). Given the impact of laminar-turbulent transition on the overallaerodynamic and heat transfer characteristics, accurate prediction and control of BLT is a critical factor in the design of hypersonic vehicles. Because modal disturbance amplification is too weak to initiate transition within the swallowing distance, non-modal growth is investigated as the potential basis for a physics-based model for the experimentally observed onset of transition. The effect ofthe nosetip geometry, discrete roughness elements, freestream disturbances, and angle of attack, on the transition onset will be investigated by means of high-fidelity simulations, via a combination of solutions to full Navier-Stokes equations, both stationary basic state computations and unsteadydirect numerical simulations, and multidimensional instability analysis techniques. The available experimental data for BLT on hemispherical and ogival configurations will be compared with the numerical results. We envision a close collaboration with several teams of experimental researchersincluding those at NASA and leading universities, such that computations will guide the experimental design and measurement strategy and, in turn, the measurements will provide the data required to verify the physical mechanisms identified by the computational analysis. Potential transition controlstrategies, such as two-dimensional or three-dimensional wall-mounted roughness elements, will also be investigated in an attempt to improve the performance of high-speed, aerospace vehicles of DoD relevance.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 29, 2020
- Source ID
- N000142012261
Entities
People
- Pedro Paredes Gonzalez
Organizations
- National Institute of Aerospace
- Office of Naval Research
- United States Navy