Author: Siavash Zabeti JahromiPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Optical Properties and Reaction Kinetics of Shock-heated Gas-phase Tracers for Quantitative Laser-induced Fluorescence
Author: Siavash Zabeti JahromiStudy of the kinetics of gas phase exchange reactions by a single pulse shock tube
Author: Alexander BurcatScientific and Technical Aerospace Reports
Author: Simultaneous Particle-Imaging Velocimetry and OH Planar Laser-Induced Fluorescence Measurements in an Unsteady Counterflow Propane/Air Diffusion Flame
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
To study the transient response of a diffusion flame to an unsteady flowfield, quantitative measurements of velocity, using particle-imaging velocimetry, and OH measurements, using planar laser-induced fluorescence, were made simultaneously in an oscillating counterflow diffusion flame. These non-intrusive measurements were performed to spatially and temporally resolve flowfield and flame characteristics as a function of initial steady strain rate and forcing frequency. For the forcing frequencies considered in this study, the strain rate fluctuations were found to lag the velocity fluctuations, but the phase difference decreased with increasing forcing frequency. At lower forcing frequencies, the width of the OH field responded quasi-steadily, but as the forcing frequency increased, the OH field showed transient effects. The dilatation velocity, defined as the difference between the minimum velocity in the preheat zone and the maximum velocity in the reaction zone, was used as a flame temperature indicator. The dilatation velocity revealed that the phase difference between the velocity and the temperature increased with increasing forcing frequency, confirming the existence of a diffusion limited response. The results presented here help to illuminate the interconnecting relationships between the chemistry, fluid dynamics, and reactant transport times.
Single-pulse Gas Thermometry at Low Temperatures Using Two-photon Laser-induced Fluorescence in NO/N2 Mixtures
Author: Experimental analysis of fast reactions in gas-liquid flows
Author: Jens TimmermannPublisher: Cuvillier Verlag
ISBN: 3736988753
Category : Technology & Engineering
Languages : en
Pages : 130
Book Description
Gases have to be specifically mixed with a continuous liquid phase to perform a reaction with high yield and selectivity. The time scales of mixing are determined by the transport processes in the boundary layer close to the phase boundary and by bubble swarm turbulence. For clarification of the local mass transfer in bubbly flows, an experimental setup is developed and successfully used to investigate single rectilinear (spherical), helical (ellipsoid) and irregular rising bubbles with and without chemical reaction. Therefore, the time resolved scanning laser induced fluorescence technique is further developed and applied for the first time to bubbly flows to allow new insights in the mass transfer processes.
Shocktube Planar Laser Induced Fluorescence Measurements in Support of the AEDC Impulse Facility
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
This paper describes the status of a program underway at AEDC to develop the Planar Laser Induced Fluorescence (PLIF) method of measurement of temperature and number density for use in the AEDC Impulse Shock Tunnel Facility. The technique is being developed in a laboratory shocktube environment which economically provides repeatable, well-characterized flow fields. A laboratory of this type is critical for the demonstration, validation, and calibration of facility diagnostics systems. PLIF nitric oxide images in shocktube flows for selected incident Mach numbers between Ms = 2.0 and 2.5 and temperatures between 1,000 and 1,500 K for spherical, 30-deg half-angle cone, and 10-deg half-angle blunt cone model geometries are presented. PLIF nitric oxide images of the flow field around a 10-deg half-angle blunt cone recorded during initial runs of the Impulse Facility are shown. Emission spectroscopy measurements in the nose cone bowshock region of the model in the AEDC Impulse Facility flow field are reported.
AIAA Journal
Author: American Institute of Aeronautics and AstronauticsPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1304
Book Description
Shocktube Studies of Gas-liquid Reactions and of Gas-phase Diffusion. Part Ii. Improved Analysis of Gas Phase Diffusion Coefficients
Author: John R. FerronPublisher:
ISBN:
Category :
Languages : en
Pages : 30
Book Description
Continued development of a method for measurement of diffusion coefficients of gases for wide ranges of temperature and pressure is described. A shocktube provides experimental conditions, and diffusivity of the gas is inferred from the rate of absorption of carbon dioxide in triethanolamine behind a reflecting shock wave. Revised analysis of data previously reported (see AD-641 435) demonstrates that the experimental results are of good precision. A new apparatus, capable of use at stronger shock conditions, is described briefly. Additional study of liquid-phase and gas-phase chemical and physical phenomena is necessary before reliable diffusion coefficients can be reported. (Author).
The Analysis of FeI Lines in Shock-heated Gas Mixtures
Author: Gregory Evan ParksPublisher:
ISBN:
Category : Gases in metals
Languages : en
Pages : 62
Book Description