Active flow control in a model combustion chamber using additional gas injection method
A.D. Kundashkin1,2, E.V. Palkin1,2, M. Yu. Khrebtov1,2, R.I. Mullyadzhanov1,2
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Novosibirsk State Technical University, Novosibirsk, Russia
Keywords: large eddy method, precessing vortex core, flow control
Abstract
The large-eddy simulation method was applied to study of isothermal swirled gas flow in a model combustion chamber at Reynolds number Re = 15000. The study identified a coherent vortex structure: this is a precessing vortex core which contributes to pressure pulsations reaching a maximum inside a model front device. It is possible to suppress this coherent structure by gas injection in a site of highest pressure pulsations. The study covers three regimes with additional gas injection with the amplitude about 1 - 5 % of the superficial flow velocity. Analysis of instant, average and spectral characteristics revealed that the developed method of flow control is a tool for suppression of low-frequency oscillation by factor of two.
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