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Modeling and understanding of supercritical injection

Event Type: 
Date and Time: 
Friday, February 19, 2016 - 16:15
Location: 
CTR Conference Room 103
Event Sponsor: 
Parviz Moin, Director of Center for Turbulence Research
Speaker(s): 
Daniel Banuti, CTR Postdoctoral Fellow

Despite being ubiquitous in technical applications (gas turbines, diesel engines, rocket engines), supercritical injection is generally considered not well understood. Far from idealized gaseous or liquid fluid behavior, there is to this date no real understanding of the underlying physical processes. Nonetheless, accurate modeling and understanding are key factors for effective CFD modeling and optimization of the technical systems.

The present talk discusses a new thermodynamic view of supercritical state transitions akin to vaporization - pseudo-boiling. The talk introduces 'pseudo-boiling' and highlights some results of the approach relevant for injection and turbulent combustion, e.g. interpretation and explanation of a reference injection experiment which could not be explained with the state-of-the-art theory of a mechanical atomization process; the structure of a supercritical jet; simplified and more accurate real gas mixture modeling.

It seems that research so far has been hindered by the lack of a quantitative theory of supercritical fluids behavior. The pseudo-boiling approach provides a framework that may show where to look and what questions to ask when devising numerical or physical experiments.

Bio: 
Dr. Daniel Banuti's focus is CFD model development and thermodynamics of high pressure injection. Before joining the Center for Turbulence Research at Stanford University, Daniel Banuti was a Research Scientist at the German Aerospace Center (DLR) in Göttingen, mainly working on numerical modeling of injection and combustion in rocket engines, other work ranged from reactive nozzle flow to hypersonics. Daniel Banuti received his PhD from Stuttgart University while working at DLR, and his MSc from RWTH Aachen University, Germany. He spent a year as Graduate Research Assistant at the University of Tennessee Space Institute.