In celebration of the first 60 years of the Air Force Office of Scientific Research, we revisit several studies of hypersonic flows dominated by rate-dependent energetic processes. The work presented shows the evolution and advancement of computational capabilities in this area, and illustrates some key lessons learned over the previous decade or so. We discuss some early work with Leyva and Hornung in the California Institute of Technology T5 Free-Piston Shock Tunnel that had the goal of validating thermochemical models for highenthalpy flows. We re-analyze several of these flows with more advanced numerical methods and find improved comparison with the experimental measurements. This work then lead to a series of experiments in the Calspan-University at Buffalo Research Center (now CUBRC Inc.) facilities at lower enthalpy. Initial comparisons were rather uninspiring, but with a better understanding of the facility behavior and the inclusion of key finite-rate processes, excellent agreement was obtained for nitrogen flows. New experiments at CUBRC in a large expansion tunnel will likely shed further light several remaining puzzles related to these flows. We also revisit an interesting study related to plasmadynamics and finite-rate processes in a different type of flow. Finally, we illustrate recent advances in numerical methods that are enabling the direct numerical simulation of key rate-dependent energetic processes in hypersonic flows.
|Original language||English (US)|
|Title of host publication||43rd Fluid Dynamics Conference|
|Publisher||American Institute of Aeronautics and Astronautics Inc.|
|State||Published - 2013|
|Event||43rd AIAA Fluid Dynamics Conference - San Diego, CA, United States|
Duration: Jun 24 2013 → Jun 27 2013
|Name||43rd Fluid Dynamics Conference|
|Other||43rd AIAA Fluid Dynamics Conference|
|City||San Diego, CA|
|Period||6/24/13 → 6/27/13|
Bibliographical noteFunding Information:
This work was sponsored by the Air Force Office of Scientific Research under grants FA9550-10-1-0563 and FA9550-12-1-0064 and by the Department of Defense National Security Science & Engineering Faculty Fellowship . The views and conclusions contained herein are those of the author and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the AFOSR or the U.S. Government.