[loacl physicists] Colloquium Announcement 9/14/2010 (Dr. Paul Danehy)

[Malin, Delicia M.]

Old Dominion University
Department of Physics

Fall Colloquium Series

Tuesday September 14, 2010

"Exploring Hypersonic Flow Using Laser Spectroscopy"


Dr. Paul Danehy
NASA

Laser-spectroscopic imaging methods can provide high-quality visualizations of planar slices in hypersonic flows and measure parameters like temperature, velocity, pressure and gas composition without disturbing the flow itself.  NASA is developing a method for 2D and 3D imaging of hypersonic flows, called Nitric Oxide Planar Laser-Induced Fluorescence (NO-PLIF). NO-PLIF has been used to study basic transition flow physics relevant to transition control for scramjet engine inlets. It has also been used to study the effects of reaction control system jets, shear layers, wake flowfields, and simulated heat-shield ablation related to high mass Mars entry technology. Additionally, NO PLIF has been used to study the Orion Crew Exploration Vehicle. Moreover, experiments motivated by the Shuttle Return-to-Flight program have included visualizations of flow transition over simulated gap fillers and a detailed study of the breach of the orbiter's wing leading edge. Quantitative measurements using a point-wise technique called Coherent Anti-Stokes Raman Spectroscopy (CARS) have been used to study supersonic combustion flows applicable to scramjet engines. CARS measures temperature and composition and can be used even in ducted engines with limited optical access. Such measurements are useful for testing and developing new computational models for predicting supersonic combustion. This talk will describe the use and application of two laser-based spectroscopic measurement (NO PLIF, and CARS) techniques to study hypersonic flows and supersonic combustion


Presentation: Physical Sciences Building II 1100 @ 3:00 pm
Refreshments: 1st Floor Atrium @ 2:30 pm

More details at http://www.physics.odu.edu
All are Welcome!


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