국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Spatially Resolved Temperature and Water Vapor Concentration Distributions in Supersonic Combustion Facilities by TDLAT
저자	Busa, K. M.;; McDaniel J. C.;; Diskin, G. S.;; DePiro, M. J.;; Capriotti, D. P.;; Gaffney, R. L.
Keyword	ABSORPTION SPECTROSCOPY;; COMBUSTION CHAMBERS;; EQUIVALENCE;; FUEL COMBUSTION;; HIGH TEMPERATURE;; NONINTRUSIVE MEASUREMENT;; SUPERSONIC COMBUSTION;; SUPERSONIC COMBUSTION RAMJET ENGINES;; TEMPERATURE DISTRIBUTION;; TEST FACILITIES;; TUNABLE LASERS;; WATER VAPOR
URL	http://hdl.handle.net/2060/20130001729
보고서번호	NF1676L-15788
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Detailed knowledge of the internal structure of high-enthalpy flows can provide valuable insight to the performance of scramjet combustors. Tunable Diode Laser Absorption Spectroscopy (TDLAS) is often employed to measure temperature and species concentration. However, TDLAS is a path-integrated line-of-sight (LOS) measurement, and thus does not produce spatially resolved distributions. Tunable Diode Laser Absorption Tomography (TDLAT) is a non-intrusive measurement technique for determining two-dimensional spatially resolved distributions of temperature and species concentration in high enthalpy flows. TDLAT combines TDLAS with tomographic image reconstruction. More than 2500 separate line-of-sight TDLAS measurements are analyzed in order to produce highly resolved temperature and species concentration distributions. Measurements have been collected at the University of Virginia''s Supersonic Combustion Facility (UVaSCF) as well as at the NASA Langley Direct-Connect Supersonic Combustion Test Facility (DCSCTF). Due to the UVaSCF s unique electrical heating and ability for vitiate addition, measurements collected at the UVaSCF are presented as a calibration of the technique. Measurements collected at the DCSCTF required significant modifications to system hardware and software designs due to its larger measurement area and shorter test duration. Tomographic temperature and water vapor concentration distributions are presented from experimentation on the UVaSCF operating at a high temperature non-reacting case for water vitiation level of 12%. Initial LOS measurements from the NASA Langley DCSCTF operating at an equivalence ratio of 0.5 are also presented. Results show the capability of TDLAT to adapt to several experimental setups and test parameters.