Abstract
In the previous paper the initial dispersion process of jet engine exhaust plume was discussed with the data of jet engine field test as well as those of the model test. The momentum dominant region in the jet was concerned mainly, and the model test was carried out for a few nozzle heights over the ground board which corresponding to the engine installing height of the aircraft. There are considerable differences of the ratio of inertia to buoyant forces in the jet for the engine operating models, i.e., for takeoff mode (TO) the inertia is dominant, on the contrary the buoyancy is dominant for idling mode (ID). These typical conditions of TO and ID modes were examined and their results are compared with each other and with those of field test. The sources of atmospheric turbulent diffusion after the jet dispersion are estimated by there results.
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