Advanced Diagnostics for Reacting Flows
Abstract
The program aimed at establishing advanced optical diagnostic techniques applicable to combustion gases and plasmas, with some emphasis on high speed flows. The primary flowfields parameters of interest are species concentrations (including electrons), temperature, mass density, pressure, and velocity, and quantities derivable from these parameter such as mass flow rate (from the product of density and velocity). The techniques under study are based on laser spectroscopy, particularly laser absorption and laser induced fluorescence, with the latter capable of providing both single-point and multi- point (2-d and 3-d) measurements. Laser sources include tunable cw lasers (ring dye and semiconductor diode lasers) and tunable pulsed lasers (excimer-pumped dye and narrow-line width excimer). The cw laser are spectrally narrow, allowing study of a new class of techniques based on spectral lineshapes and shifts, while the pulsed lasers provide intense bursts of photons needed for techniques based on light-scattering phenomena. Accomplishments of note include: the first simultaneous measurements of temperature, pressure and velocity in high speed flows; the first application of tunable semiconductor diode lasers to absorption and fluorescence measurements in high temperature plasmas and supersonic flows; the first application of the planar laser-induced fluorescence (PLIF) technique to nonequilibrium shock tube flows; and further advances in the development of a laser-photolysis shock tube for rate constant measurements of elementary combustion reactions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 29, 1990
- Accession Number
- ADA232609
Entities
People
- Ronald Kenneth Hanson
Organizations
- Stanford University