, Volume 2, Issue 3-4, pp 257-272

Role of flow visualization in the development of UNICORN

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Abstract

This paper describes how visualizations have been used in the development and evaluation of a reacting-flow-simulation model known as UNICORN (UNsteady Ignition and COmbustion with ReactioNs). UNICORN, which solves full Navier-Stokes equations, has evolved over a 6-year period and is perhaps one of the most thoroughly evaluated codes of its kind. It evolved hand-in-hand with experiments that have been conducted to test its ability to predict ignition, extinction, and the dynamic characteristics of diffusion and premixed flames of hydrogen, methane, and propane fuels and that are stabilized in different ways. This paper also describes how UNICORN has been used, in conjunction with experiments, to provide new insights into combusting flows. Also, predictions of unobserved phenomena that were later confirmed by experiments are described. This paper demonstrates that the judicious use of a well-validated simulation in conjunction with laser based diagnostics is an effective way of understanding complex combusting flows.

William Melvyn “Mel” Roquemore: He received BS degree in Physics in 1963 from Auburn University. After graduation, employed at the Air Force Aero Propulsion Laboratory. Received MS degree in Physics in 1969 from the University of Dayton and Ph.D. degree in Physics from the University of Cincinnati as part of an Air Force Long Term Training Program. Is currently Senior Scientist at the Propulsion Directorate of the Air Force Research Laboratory. Directs experimental and computational research involving fundamental combustion processes and advanced combustor concepts. Is an Air Force Research Laboratory Fellow and has authored 150 publications in combustion and combustion diagnostics.
Viswanath Reddy Katta: He received B.Tech. degree in Electrical Engineering in 1979 from Jawaharlal Nehru Technological University and M.Tech. and Ph.D. degrees in Aerospace Engineering from Indian Institute of Technology, Madras, in 1981 and 1986, respectively. Worked at Nagoya University, Japan, before moving to U.S. in 1989. NRC Post Doctoral Fellow and then employed by SRL before taking current position. Cofounder and Vice-President of Innovative Scientific Solutions Inc. Current interests include simulation of reacting flows, droplet combustion, detonations, vortex dynamics, and fuel thermal stability. Authored more than 150 technical papers in these areas. Associate Fellow of AIAA and member of APS, ASME, and Combustion Institute.