Anregbarkeit der Kelvin-Helmholz-Instabilität in der freien Scherströmung hinter einer scharfen Kante

TL;DRAbstract

The generation and compensation of instability waves in the detached free shear layer behind the trailing edge of a splitterplate that separated to regions with different flow velocities, are investigated to understand how the instability wave is excited. A decomposition of the measured flow field is applied for the first step to handle this problem: the field of instability wave, the exciting field and the near field which does not belong to the first two fields. In order to investigate the near field the apparent field is introduced, which is produced by the movement of the sher layer because of the exciting field. The special near field that was constructed not to excite the instability wave in the shear layer is very similar to the respective apparent field. The apparent fields differ between the exciting and non-exciting case by the non-vanishing divergence in the near region behind the splitterplate.

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