Development of a Time-Resolved Particle Image Velocimetry and High Speed Imaging System for Vorticity Dominated Flows
Abstract
A number of time-resolved measurement techniques and associated instrumentation have been developed to perform time series and statistical analysis of unsteady flows. These include hot-wire anemometry and Laser Doppler Anemometry to measure time dependent characteristics of the flow field. Recent advances in laser based whole field diagnostics and powerful processing and computational methods are ushering in a new era in time-resolved imaging with the potential to provide tremendous insight into time-dependent flow properties. The proposed instrumentation acquisition is to develop a Time-resolved Stereoscopic Particle Image Velocimetry (TR-SPIV) system. TR-SPIV requires a high-power and high-repetition rate laser, two high-speed CMOS cameras, a computer equipped with a frame grabber card and a timer for data acquisition and processing. In the recent years, some development in TR-SPIV has been observed but its applications to date have been limited to simpler problems over a limited range of test conditions. The proposed TR-SPIV technique will be applied to and evaluated under realistic conditions at the FAMUFSU College of Engineering. A number of technically challenging and DoD-relevant problems that involve complex, time-dependent vortex dominated flows will be carefully probed to gain insight into the critical time-dependent properties. For example, we are currently investigating vortex asymmetry and its control on axisymmetric pointed forebodies at high angles of incidence, research that is very relevant to and is supported by Army Research Office (ARO). Through the proposed instrumentation acquisition grant, our objective is to acquire the equipment necessary to measure time dependent flow properties during the critical phase when vortex asymmetry develops. Another project that will significantly benefit from the proposed instrumentation is the study of three-dimensional shock-wave turbulent boundary layer interactions, research supported by AFOSR but relevant to a number of DoD branches. The instrumentation proposed here will not only provide immediate benefits to existing projects, it will also lay the groundwork for a dramatic shift in the fluid dynamics and flow control research. The time-resolved three-dimensional (3D) velocity measurements will provide the critical data required to develop improved low-order models and rigorous validation of simulation tools for unsteady 3D flows. The proposed instrumentation will be integrated with the existing low speed and polysonic wind tunnel facilities at the FAMU-FSU College of Engineering and become an integral part of research, education and training at the undergraduate and graduate level. The primary objective is to accelerate the development of time-resolved PIV and high speed imaging and its application at realistic flow conditions. This equipment will also greatly enhance our ability to educate and train student-scientists and -engineers to work on interdisciplinary problems in multicultural teams. The system will be made available to researchers working on defense related problems within the broader community. As part of our educational outreach, we along with Challenger Learning Center of Tallahassee, an outreach arm of the FAMU-FSU College of Engineering, organize STEM camps for middle and high school students. The students visit our wind tunnel facilities and participate in the demonstration of flow visualization on various aerodynamic configurations. The proposed instrumentation will significantly enhance their experience and motivate them toward pursuing STEM education.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 20, 2018
- Source ID
- W911NF1610528
Entities
People
- Kumar Rajan
Organizations
- Army Contracting Command
- Florida A&M University
- Office of the Secretary of Defense