| The focus of this dissertation is on the numerical study of (1) the interaction of two adjacent synthetic jets and (2) the vectoring control of a primary jet with synthetic jets. Incompressible Reynolds-averaged Navier-Stokes equations are employed with Spalart-Allmaras one-equation turbulence model in the numerical simulations.;The interactions of two adjacent synthetic jets with different relative phases are simulated. The temporal evolution of the merged jet is studied and compared to the experiments. The effects of the distance between the two synthetic jets, the oscillating frequency and the velocity amplitude of the synthetic jets on the merged flow are quantified. A physical explanation is provided to explain why the merged jet is generally vectored to the side of the phase-leading synthetic jet.;In addition, Vectoring control of a primary jet with one single and two adjacent synthetic jets is computed in pull modes. Numerical results are compared with experiments. The inclusion of synthetic jet cavity in the simulations gives a better comparison with the experiments than the simulations without cavity; the difference between the two sets of simulations is analyzed. Effects of various parameters on vectoring of the primary jet, such as the location, frequency, velocity amplitude and angle of the synthetic jet, are studied and the optimal values of these variables for the largest vectoring angle of the primary jet are obtained for several cases. Extensive simulations are performed at an emanating angle of 60° of the synthetic jet since this case results in significant vectoring of the primary jet. A hypothesis is presented to explain the vectoring of the primary jet due to the interaction between the primary jet and the synthetic jet. A preliminary engineering analysis of an application of synthetic jet technology to vectoring control of a F/A-18C aircraft is presented. |
