Recirculating turbulent flow within a cavity with an inlet wall jet was examined. In steady water flow velocity profiles were constructed with measurements taken with a Laser Doppler Anemometer system mounted on a traversing mechanism. Two test cases were examined Re jet = 1167 and Re jet = 3231 as well as developing wall jet profiles. The results are presented with mean velocity plots and turbulent kinetic energy contours. Comparisons are then made with results obtained using a finite difference computational scheme based on the k - e turbulence model. Good agreement was obtained between the computer code predictions and the experimental data. / Thesis / Master of Engineering (ME)

The flow of jets in confining enclosures has significant application in many engineering processes. In particular, two jet flows have been studied; the impingement of axisymmetric jets in a confined space and a turbulent inlet wall jet in a confining enclosure. The impingement of axisymmetric jets in a cavity has been examined using flow visualization, laser Doppler anemometry, and numerical simulations. When the flow field was examined under various geometrical and fluid parameters several flow regions were found, depending on the geometrical and fluid parameters. Initially, a steady flow field existed for all arrangements for Red < ~90 but subsequent increments in the fluid velocity caused an oscillating flow field to emerge. The onset of the oscillations and the upper limit of finite oscillations were found to be a function of the nozzle diameter to chamber dimension ratio. Although steady numerical simulations predicted the steady flow field well, steady simulations of the oscillating flow field over-predicted the peak axial velocities. The oscillating flow field is considered to be a class of self-sustaining oscillations where instabilities in the jet shear layer are amplified because of feed back from pressure disturbances in the impingement region. The turbulent wall jet in a cavity has been studied using flow visualization, laser Doppler anemometry (LDA), particle streak velocimetry (PSV) and numerical simulations. Instantaneous PSV measurements agreed well with time averaged LDA measurements. Two dimensional simulations using an algebraic stress turbulence model (ASM) were in better agreement with the experimental data than two and three dimensional simulations using a k - ε turbulence model in the wall jet region. A wall jet growth rate was found to be 54% higher than a wall jet in stagnant surroundings due to the enclosure boundaries. / Thesis / Doctor of Philosophy (PhD)