Diagnostic Techniques for High Speed Flows

The U.S. Air Force Research Laboratory has determined that a need exists for new diagnostic instrumentation capable of obtaining quantitative flow data in large scale aerodynamic facilities, with particular emphasis on the high subsonic (Mach ~0.7) to moderate supersonic (Mach ~2-3) flow regimes. This Phase I Small Business Innovative Research (SBIR) proposal, offered by Innovative Scientific Solutions, Inc., in collaboration with the Ohio State University Department of Mechanical Engineering, offers a new avenue for non-intrusive instrumentation based upon the application of ultra-fast laser technology to a class of optical diagnostic known as Flow Tagging Velocimetry. Phase I will primarily focus on demonstration of the enhanced potential of the oxygen-based flow tagging method known as RELIEF (Raman Excitation + Laser Induced Electronic Fluorescence), resulting from the use of ~100 picosecond laser sources for the "tagging" step. Phase II, building upon the results of Phase I, will explore a wide range of potential flow tagging strategies, and will culminate in demonstration and delivery of a complete ultra-fast system to the AFRL Air Vehicles Directorate.