국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Transition Mixing Study Final Report
저자	R. Reynolds and C. White
Keyword	Combustor; Transition-mixing; Computer model
URL	http://gltrs.grc.nasa.gov/reports/1986/CR-175062.pdf
보고서번호	NASA CR-175062
발행년도	1986
출처	NASA Glenn Research Center
ABSTRACT	An analytic program has been conducted to develop a computer model capable of analyzing the flow field in the transition liner of small gas turbine engines. A Fortran code has been assembled from existing codes and physical submodels and used to predict the flow in several test geometries which contain characteristics similar to transition liners, and for which experimental data was available. Comparisons between the predictions and measurements indicate that the code produces qualitative results but that the turbulence models, both K-E and algebraic Reynolds Stress, underestimate the cross-stream diffusion. The code has also been used to perform a numerical experiment that examined the effect of a variety of parameters on the mixing process in transition liners. Comparisons between the different analyzed cases have illustrated that geometries with significant curvature show a drift of the jet trajectory toward the convex wall and weaker wake region vortices and decreased penetration for jets located on the convex wall of the liner, when compared to jets located on concave walls. Also shown were the approximate equivalency of angled slots and round holes and a technique by which jet mixing correlations developed for rectangular channels can be used for geometries.