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. |