국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Dilution Jet Mixing Phase II Program
저자	R. Srinivasan, E. Coleman, and K. Johnson
Keyword	Dilution-zone; Jet-mixing; Combustion
URL	http://gltrs.grc.nasa.gov/reports/1984/CR-174624.pdf
보고서번호	NASA CR-174624
발행년도	1984
출처	NASA Glenn Research Center
ABSTRACT	The main objectives of the NASA Dilution Jet Mixing Phase II were to quantify the mixing of opposed rows of jets (two-sided injection) in a confined cross-flow. Parametric tests were performed to determine the effects of the following on jet mixing characteristics: 1) Orifice spacing to diameter ratio, S/D; 2) Duct height to diameter ratio, H0/D; 3) Jet-to-mainstream momentum flux ratio, J; 4) Non-uniform mainstream profile upstream of the dilution orifices; and 5) Flow area convergence. The general conclusions derived from the Phase II efforts are: 1) Jet penetrations for two-sided injections are less than that for single-sided injections (investigated in Phase I), but the jet spreading rates are faster for a given momentum ratio and orifice plate; 2) Flow area convergence generally enhances mixing. The mixing characteristics with asymmetric and symmetric convergence are similar; 3) For constant momentum ratio, the optimum S/H0 with in-line injections is one-half of the optimum value for single-sided injections. For staggered injections, the optimum S/H0 is twice the optimum value for single-sided injection; and 4) The correlations developed in this program predict the temperature distributions within first order accuracy. They provide a useful tool for predicting jet trajectory and temperature profiles in the dilution zone with two-sided jet injections.