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Numerical Investigation of the Liquid Atomisation at Rotating Holes using the Volume-of-Fluid Method

Numerical Investigation of the Liquid Atomisation at Rotating Holes using the Volume-of-Fluid Method
Tagung:

ILASS - Europe 2016, 27th Annual Conference on Liquid Atomization and Spray Systems

Tagungsort:

Brighton, UK

Datum:

04.09.2016 - 07.09.2016

Autoren:

Krug, Matthias B.
Höfler, Corina
Bauer, H.-J.

This paper presents results of three-dimensional numerical investigations on the liquid atomisation at a rotating hole as found in fuel slingers in the combustion chamber of small sized aero engines. Simulations applying the Volume-of-Fluid method with an Adaptive Mesh Refinement algorithm were carried out at atmospheric pressure and temperature in order to study the influence of the operating conditions and geometric boundary conditions on the atomisation behaviour and droplet characteristics. The results for different rotational speeds, liquid flow rates and hole diameters were analysed and validated against analytic solutions.

Good agreement of modelled and analytical results could be obtained for the prediction of both the liquid film thickness inside the rotating channel and the break-up mode at the hole. Further analysis of the atomisation visualisation and resulting droplet diameters showed that the application of an Adaptive Mesh Refinement algorithm employed at the phase interface provides a sufficient resolution of the small scale phenomena observed during the liquid atomisation at rotating holes. As found in literature, the predicted arithmetic mean diameters are only depending on the occurring Weber number.