The effect of flare geometry on the flow field generated by radial-radial swirlers

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2023-1-27

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Bay, Ayşe

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An experimental investigation is conducted to assess the impact of the flare geometry on the mean flow field generated by radial-radial swirlers. Two-dimensional two-component PIV measurements are performed on the mid-plane of a non-reacting planar combustor test section. A baseline geometry without a flare is compared to four swirlers with three different flare geometries. Analysis of the time-averaged flow fields reveals that there is an increase in radial velocity values and a decrease in axial velocity values as a result of the introduction of the flare geometry, which results in a sudden expansion of the swirling jet. When different flare geometries are compared, almost identical flow fields are observed and the formation of a CRZ is not observed for any configuration that employs a flare geometry. Although the maximum negative axial velocity values decrease for geometries with flare, due to the increase of the recirculation radius, the recirculating mass flow rate is higher than the baseline swirler. On the other hand, the recirculating mass flow rate is higher in the co-rotating swirler configuration due to a stronger adverse pressure gradient along the central axis of the jet when compared to the counter-rotating configuration. High TKE regions are observed at shear layers between the swirling jet and the CTRZ as well as the swirling jet-CRZ for the Baseline-CR. Regions of high TKE generate intense mixing regions. Coherent flow structures are identified by using the snapshot POD method and different mode shapes obtained for swirlers with and without flare geometry are reported. It is shown that the change in the sense of rotation and flare geometry does not bring about any differences in the POD modes and their energy contents for the given swirl number and confinement conditions.

Subject Keywords

Swirling flow, PIV, Flare angle, Channel orientation

URI

https://hdl.handle.net/11511/102535

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

A. Bay, “The effect of flare geometry on the flow field generated by radial-radial swirlers,” M.S. - Master of Science, Middle East Technical University, 2023.