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Title：How laser diagnostics helps to improve heat transfer predictions in internal combustion engines

Speaker： Volker Sick, Professor, Department of Mechanical Engineering，The University of Michigan，Ann Arbor, Michigan, USA

Time： 14：00 to 15：00,Mar 27,2017

Place： D307, School of Mechanical Engineering

Abstract: This talk will focus on how optical diagnostics are developed, applied, and what is learned about near-wall layer flows in internal combustion engines and how results from high frame rate measurements are used to advance heat transfer models that can be integrated into 3D simulations. Boundary layers in internal combustion engines differ from those in other flow situations because external flow, pressure, temperature, and composition change on short time and length scales. Steady-state conditions are not reached and non-equilibrium effects therefore might become important in the description of mass and momentum transfer in near-wall regions. Micro-Particle Image Velocimetry was adapted to measure velocity fields but a variety of challenges had to be overcome to achieve reliable and useable data. Quantifying the thermal stratification using laser-induced fluorescence imaging in near-wall layers poses a range of challenges that include poor signal strength, image distortion due to index of refraction gradients, amongst others. We will demonstrate how the results of high frame rate measurements were used to guide the development and validation of improved models for near-wall layer modeling and show where improvements were made.

Biographical : Volker Sick holds appointments at the University of Michigan as Arthur F. Thurnau Professor of Mechanical Engineering and as Associate Vice President for Research. He earned degrees in Chemistry and Physical Chemistry from the University of Heidelberg in 1988 (Diplom), 1992 (Dr. rer. nat), and 1997 (Habilitation). At the University of Michigan, Ann Arbor, he built an internationally recognized program in laser-based imaging diagnostics and engine research. The Combustion Institute recognized his work with the Silver Medal and ASME honored him with the 2015 Internal Combustion Engine Award. He is a Fellow of SAE International. His awards include a number of teaching awards and citations for international engagement. He serves as the Editor of the Proceedings of the Combustion Institute and on the editorial boards of Experiments in Fluids and Progress in Energy and Combustion Science.