LDA measurements on swirling flows in tubes

M. Kok; F. J.J. Rosendal; J. J.H. Brouwers

doi:10.1117/12.150571

6 August 1993 LDA measurements on swirling flows in tubes

M. Kok, F. J.J. Rosendal, J. J.H. Brouwers

Proceedings Volume 2052, Fifth International Conference on Laser Anemometry: Advances and Applications; (1993) https://doi.org/10.1117/12.150571
Event: Laser Anemometry: Advances and Applications: Fifth International Conference, 1993, Koningshof, Veldhoven, Netherlands

Abstract

As part of research on swirler stabilized combustors, swirling flows in an expanding and, after a length L, contracting tube are investigated. If the flow is given sufficient rotation in a flow pattern with central recirculation area is measured in a tube with expansion ratio 0.69. In a larger tube with expansion ratio 0.23 a toroidal recirculation area is found. The time dependence of the flow is investigated by determining the autocorrelation function of the velocity signal. In the range of rotational velocities of the flow the flow field is shown to be periodic in time. This is a very interesting phenomenon that occurs only in sufficiently large tubes, with expansion ratio normally encountered in industrial furnaces. Numerical simulation of this flow will be difficult as it is periodically oscillating and probably not axisymmetric.

Citation Download Citation

M. Kok, F. J.J. Rosendal, and J. J.H. Brouwers "LDA measurements on swirling flows in tubes", Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); https://doi.org/10.1117/12.150571

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