DURIP STEREO FEMTOSECOND LASER ELECTRONIC EXCITATION TAGGING SYSTEM FOR HYPERSONIC WIND TUNNEL MEASUREMENTS
Abstract
Hypersonics is a complex, multi-physics and inter-disciplinary field. Much uncertainty remains with regard to the flow physics that can only be partially addressed by flight tests and simulations. Accurate hypersonic wind tunnel measurements are a crucial piece of the puzzle. Of particular importance are nonintrusive measurements of all three velocity components with high spatial- and temporal-resolution. Different from the low-speed regime, laser Doppler anemometry and particle image velocimetry are not a feasible choice. Presently, Femtosecond Laser Electronic Excitation Tagging (FLEET) is being developed for hypersonic wind tunnel measurements. Such systems use femtosecond laser pulses to excite nitrogen gas molecules. As the molecules fall back into their basic state, they emit energy, which is detected by a high-speed camera. FLEET systems are comprised of a femtosecond pulse laser, a high-speed camera, a computer for image acquisition and processing, optics and a timer to synchronize the entire system. The proposed instrumentation will considerably strengthen NMSU’s ability to carry out competitive research in hypersonics in areas relevant to the Department of Defense. By providing a uniquely new capability, it will allow NMSU to become a viable partner for anticipated future multi-university research initiatives. The system will also support high-speed computational fluid dynamics research at NMSU by providing validation data. The stereo-FLEET system will be utilized to promote graduate and undergraduate education at NMSU. The proposed system will provide a critical practical component to high-speed fluid dynamics course material taught at NMSU.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 20, 2023
- Source ID
- FA95502210352
Entities
People
- Fangjun Shu
Organizations
- Air Force Office of Scientific Research
- New Mexico State University
- United States Air Force