Seminar: Slot and Discrete Jets in Crossflow-The Role of External Perturbations

Dr. Sumanta Acharya, Illinois Institute of Technology

All dates for this event occur in the past.

E001 Scott Lab
E001 Scott Lab
201 W. 19th Ave.
Columbus, OH 43210
United States

Jets in crossflow are encountered in a variety of applications including turbine cooling, electronic cooling, VSTOL aircrafts, and plume discharges. As an example, in modern gas turbine engines components are subject to gas temperatures in excess of 30000 F that are well above the material limits for reliable operation. The engine components have to be therefore actively cooled to prevent engine failure. One of the more common cooling strategies is injecting a coolant jet onto or from the surface into the crossflow. The mixing of the coolant jet dictates the effectiveness of the cooling. In this talk, the physics of jets-in-crossflow is analyzed based on Large Eddy Simulation (LES) results. Both slot-jets and discrete-jets are studied. In particular, the spectral characteristics of both the flow and thermal fields are examined in order to identify the modes that play an important role on the temperature distributions near the surface (or on the cooling effectiveness). The role of external disturbances originating upstream of the crossflow (i.e., freestream turbulence) or in the plenum feeding the coolant jet are examined in detail.

About the Speaker

Sumanta Acharya is currently Professor and Department Chair of Mechanical, Materials and Aerospace Engineering at the Illinois Institute of Technology, Chicago. From 2010-2014, he served as the Program Director of the Thermal Transport Program in the Directorate of Engineering at the National Science Foundation (NSF). From 2014-2016, he was the Ring Companies Chair and Department Chair of the Mechanical Engineering Department at the Herff College of Engineering. His academic career prior to 2014 was at Louisiana State University (LSU) where he was the L. R. Daniel Professor and the Fritz & Francis Blumer Professor in the Department of Mechanical Engineering (ME). He was the founding Director (in 2003) of the Center for Turbine Innovation and Energy Research (TIER) which focused on energy generation and propulsion research. His scholarly contributions include mentoring nearly 85 post-doctoral researchers and graduate students, and publishing nearly 200 refereed journal articles and book chapters and over 230 refereed conference/proceedings papers. Professor Acharya was awarded the 2015 AIAA Thermophysics Award, the 2014 AIChE Donald Q. Kern Award, the 75th ASME Heat Transfer Division Medal (in 2013), and the 2011 ASME Heat Transfer Memorial Award in the Science category.  He currently serves as the Chair of the Heat Transfer Division at ASME.

Hosted by Professor Sandip Mazumder