Experimental and mathematical modeling of the interaction of a perturbed free shear layer with a flat plate
Abstract
A mathematical model which predicts the upstream effects of the impingement of shear layers on a solid boundary located in the linear region of the shear layer is developed. The model is compared with experimental results. The experimental results and the model suggest that the oscillations that are most amplified are those whose feedback signals from the disturbance plate are nearly in phase with the wave at the splitter plate separation edge. This causes the frequency of the oscillations to gradually decreases as the plate is moved downstream. This drop continues until a certain impingement length is reached where the oscillations can not sustain themselves and by addition of an extra wavelength between the splitter plate and plate leading edge, the phase condition is again satisfied. The effect of a plate located in the nonlinear region on the flowfield of a shear layer is investigated experimentally. This phase of the study places emphasis on the three main regions of the shear layer flow interacting with a plate: the impingement region, the plate region and the wake region.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1985
- Bibcode:
- 1985PhDT........33M
- Keywords:
-
- Flat Plates;
- Mathematical Models;
- Perturbation;
- Shear Flow;
- Shear Layers;
- Flow Distribution;
- Nonlinearity;
- Oscillations;
- Prediction Analysis Techniques;
- Fluid Mechanics and Heat Transfer