Accession Number : ADA522512


Title :   Progress in Applying Tunable Diode Laser Absorption Spectroscopy to Scramjet Isolators and Combustors


Descriptive Note : Final rept. 1 Sep 2006- 10 May 2010


Corporate Author : AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION SCIENCES BRANCH


Personal Author(s) : Brown, Michael S ; Williams, Skip ; Lindstrom, Chadwick D ; Barone, Dominic L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a522512.pdf


Report Date : May 2010


Pagination or Media Count : 37


Abstract : Development of advanced propulsion systems of interest to the Air Force requires study of the harsh physical environments associated with reacting flows characterized by extremes in temperature and pressure and composition in the case of plasmas. Such environments are difficult to study in detail with methods that make use of physical intrusion into the local environment. Such difficulties motivate the use of noncontact means of study such as optical approaches. By taking advantage of impressive advances in diode laser and associated technology, tunable diode laser absorption spectroscopy (TDLAS) has become a widespread tool for optical diagnostics in reacting flows. Measurements of target species concentration, temperature, pressure, and velocity have been demonstrated in a wide variety of environments by several research groups. Commercialization of niche measurement instruments based on TDLAS has been achieved. The current maturity of the technique enables its application to hypersonic flow paths -- scramjet engines in particular. In this report we summarize our progress in applying TDLAS to scramjet isolators and combustors.


Descriptors :   *LASER SPECTROSCOPY , *DIODE LASERS , *SUPERSONIC COMBUSTION , LASER DIAGNOSTICS , HYPERSONIC FLOW , OPTICAL CIRCUITS , PROPULSION SYSTEMS , PLASMAS(PHYSICS) , BOLTZMANN EQUATION


Subject Categories : Lasers and Masers
      Combustion and Ignition


Distribution Statement : APPROVED FOR PUBLIC RELEASE