Numerical Simulation of the dissociation of I2 by O2 (1 Delta) in a Two Dimensional Parallel Jet
Abstract
The thin-shear-layer equations are solved for a two dimensional parallel jet of molecular iodine in singlet delta oxygen freestream, to investigate the effect of mixing and water vapor on molecular iodine dissociation in Chemical Oxygen-Iodine Lasers (COIL). Predicting the dissociation of molecular iodine has been identified as the largest source of error in COIL performance modeling. Recent experimental and modeling experience have indicated that much of the problem may be due to the coupled iodine mixing and dissociation process. The numerical code was used to study the combined mixing and dissociation problem. Comparison of a set of 1-D premixed cases and 2-D jet cases with varying jet velocity ratios (and mixing rates) indicates that, imperfect mixing which results in initial regions of high iodine concentration leads to faster dissociation rates. High laser gain, however, does require efficient mixing. The results of both premixed and jet mixed cases with and without water vapor in the oxygen stream demonstrate the strong dependence of the dissociation efficiency (i.e., the penalty paid to dissociate iodine) on both the device geometry and operating conditions which challenges the wisdom of suing empirically determined efficiency factors to predict COIL performance. Theses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1989
- Accession Number
- ADA206137
Entities
People
- Jeffrey A. Miller
Organizations
- Air Force Institute of Technology