Advanced Diagnostics for Reacting Flows
Abstract
Advanced optical diagnostic techniques relevant to propulsion were investigated. The techniques studied were based on laser spectroscopy, with emphasis on spectrally-resolved absorption and laser-induced fluorescence (LIF). Laser sources included tunable cw near-infrared diode lasers and tunable (or fixed-wavelength) pulsed lasers operated at ultraviolet and infrared (IR) wavelengths. The cw lasers were spectrally narrow, allowing study of innovative diagnostics based on spectral line shapes, while the pulsed lasers provided intense bursts of photons needed for techniques based on LIF. Accomplishments of note included: development of new diagnostic methods based on IR planar laser-induced fluorescence (IR-PLIF); demonstration of ultra-sensitive detection of CO through the first use of 2.3-micron diode lasers for combustion applications; initial measurements of absorption and fluorescence properties of 3-pentanone, enabling evaluation of this species as a flow tracer in air-breathing propulsion flowfields; continued development of a novel facility for studies of combustion gas spectroscopy at high pressures; and final development and testing of a new sensor for monitoring velocity in hypervelocity streams via Doppler-shifted absorption of 770 nm diode laser light.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2000
- Accession Number
- ADA392651
Entities
People
- Ronald Kenneth Hanson
Organizations
- Stanford University