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Active Flow Control of Vortex Rope in a Conical Diffuser

Ardalan Javadi (Institutionen för tillämpad mekanik, Strömningslära) ; Håkan Nilsson (Institutionen för tillämpad mekanik, Strömningslära)
IAHR WG Meeting on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems, Ljubljana 2015 (2015)
[Konferensbidrag, refereegranskat]

The vortex rope in a flow similar to 70% of Francis turbine part-load is controlled using the active jet flows injected from the runner crown. The study is undertaken with numerical modeling using hybrid RANS-LES method. The comprehensive study of Javadi and Nilsson (J. Flow, Turbulence and combustion, 2015) is considered as the base case and the effectiveness of the flow control technique used in this paper is compared with the validated numerical results presented in that study. The continuous jets with different momentum fluxes are used. The investigation shows that the pressure pulsation, turbulent structures and the size of the vortex rope decrease with the injected jet from the runner crown. Although the volume flux of the jet is about 4% of whole flow rate of the swirl generator, the momentum flux and the jet position are decisive factors in the effectiveness of the technique.

Nyckelord: Flow control, Vortex rope, Hybrid RANS-LES



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Denna post skapades 2015-09-08.
CPL Pubid: 222056