Title: Modeling of High-Speed Combustion
Speaker: Foluso Ladeinde
From: Faculty of Technology, University of Ibadan (Nigeria)
Date: Apr. 8, 2015 9:00~10:00
CV of the Speaker:
Dr. Ladeinde received his B. Sc. degree from the Faculty of Technology, University of Ibadan (Nigeria), which was formerly a College of the University of London. He moved to the United States in 1981. Since then, he has earned several post-graduate degrees at Cornell University, Ithaca, New York, including his Ph.D. in Mechanical and Aerospace Engineering in 1988. He worked for several years as a high-performance computing (HPC) software developer before joining the faculty of the State University of New York, Stony Brook in 1991 as an Assistant Professor of Mechanical Engineering, where he has since been promoted and tenured. Dr. Ladeinde is a Visiting Professor and a Summer Faculty Fellow of the United States Air Force and the United States National Research Council, and a Visiting Scientist at the United States Department of Energy at the Brookhaven National Laboratory. He has chaired the External Review Board of the NASA Center for Aerospace Research at North Carolina (NC) A&T University in Greensboro, NC. Dr. Ladeinde has produced over 250 publications in internationally-recognized archival journals (including The Journal of Fluid Mechanics, Physics of Fluids, and The AIAA Journal) and peer-reviewed conference proceedings.
He has served as an Associate Editor (2009-2014) of the AIAA Journal, the flagship journal of the AIAA, as well as a Book Reviewer for Cambridge University Press in the area of theoretical fluid dynamics. Dr. Ladeinde’s 2010 paper on scramjet computer simulation won AIAA Best Paper Award. He is a Fellow of ASME, a Life Member and an Associate Fellow of the American Institute of Aeronautics and Astronautics (AIAA), a Life Member of APS, and the Chairman of the Department of Mechanical Engineering at SUNY Korea.
Abstract:
The flamelet approach has been proposed by some as a highly promising procedure for modeling turbulence-combustion interaction in scramjets because of the method’s ability to affordably handle detailed kinetics. Five recent contributions to supersonic combustion modeling, collectively processed in a special section organized by the present author, were published in the AIAA Journal [AIAA Journal Vol. 48, No.3, 2010]. The papers appear to represent the state-of-the-art of scramjet combustion modeling. The present author was also an integral part of an AFRL-funded team that recently enhanced the supersonic combustion apabilities in VULCAN, by making the code to be high-order, improving the large-eddy turbulence models in it, adding two-phase flow capabilities, as well as enabling VULCAN to affordably employ detailed kinetic mechanisms via the flamelet approach. Despite the progress in supersonic combustion modeling, more work is needed, including the development of the precise models for the unstart phenomenon and affordable turbulence/combustion models. Recently, we started to investigate the various ways in which pressure comes into the picture, although with a current focus on pressure effects due mainly to high speed. Our approach is based on close-form analytical solutions, or triple-deck asymptotic theories, that explicitly express the reaction rate as a function of Mach number and/or pressure and temperature. This study thus allows us to assess the validity of the pressure-based reaction rate scaling that has recently been introduced into high-speed combustion modeling. We are also investigating the use of the characteristics method to analyze three-dimensional supersonic combustion. At the presentation, we will discuss the fundamentals and how our analytical results compare with numerical data.
