Abstract
A rectangular turbulent jet has a complex three dimensional flow field. These jets are frequently used in industry, however their flow field dynamics are not understood. The objective of this study was to increase the understanding of the rectangular jet. To do this, two rectangular nozzles were constructed and the subsonic jet velocities were measured, analyzed, and interpreted. The study concentrated on the near field region where the three dimensional flow field develops. Nozzles with aspect ratios of 1x2 and 1x4 were used to create jets at a Match number of 0.09. Measurements were made using a 3 component laser Doppler anemometry system. A dense measurement grid was used to effectively map the jets in both axial and cross sectional planes. The analysis included the time averaged velocity field, the complete Reynolds stress tensor, vorticity, turbulent kinetic energy production and other parameters. Comparisons were made with previous studies. Also a method of determining the mean pressure change in the jet flow field based on velocity and Reynolds stress tensor gradients was presented and compared with experimental data and numerical predictions. The results, analysis and interpretation were frequently related to previous theoretical vortex system models. As a result of discrepancies, a new vortex system model is presented. This study contributes substantially to the current understanding of 3 dimensional jet flow fields.
Swan, David Herman (1990). Flow field study of a rectangular jet. Texas A&M University. Texas A&M University. Libraries. Available electronically from
https : / /hdl .handle .net /1969 .1 /DISSERTATIONS -1163165.