Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 70: Poster: Flows, Patterns, Delay, Reaction Diffusion

DY 70.2: Poster

Thursday, March 15, 2018, 15:30–18:00, Poster A

Optimization of non-contact seals — •Sabine Bogner — Universität Ulm, Institut für Experimentelle Physik

The non-contact seal of interest provides a separation between an upper and a lower chamber that are connected by a shaft. In the lower chamber there is a hydraulic driving and therefore a lot of liquid is present in the chamber. The upper chamber is filled with air that must be kept clean from liquid. Thus, the seal in between the two chambers must on the one hand prevent the liquid in the bottom chamber from flowing to the upper chamber. On the other hand, it must be contact-free in order to prevent friction between the shaft and its surroundings so that it can rotate freely.

In its current state the sealing effect should be reached by a labyrinth like geometry of a partition wall that divides the two chambers in combination with a fan arranged below the partition wall.

To improve the seal the pressure ratios inside the system are measured for different rates of rotation with an experimental setup. Apart from that the path of the penetrating liquid is analyzed both in the system itself and with CFD simulations. Different geometries of the partition wall labyrinth and the leak fan are tested with respect to their influence on the stream of air and liquid.