Abstract
Efficiency of combustion processes is related to fuel-oxidizer mixing and interactions between a flame and a flow field. Their control can be achieved by passive and/or active techniques and may lead to considerable improveme... | Find, read and cite all the research you need on Tech Science Press
Highlights
Control of the mixing processes in turbulent flows lead to improvement of efficiency, safety and performance of various technological devices
The active methods are often combined with passive techniques, e.g., in combustion chambers where bluff-bodies and swirlers represent passive control elements and active control is ensured by an acoustic excitation which, with carefully chosen frequency, acts on large flow structures that drive combustion instabilities
The cold fuel jet is heated up and ignites a few pipe diameters (D = 0.00457 m) downstream. We modified this configuration in the following way: (i) for passive control we added various shape orifices inside the nozzle, as shown in Fig. 1; (ii) for active control we applied sinusoidal modulation combined of axial and flapping terms with amplitude A=0.15Uj and frequency (f) defined by the Strouhal number equal to St = Df/Uj = 0.3 and 0.45
Summary
Control of the mixing processes in turbulent flows lead to improvement of efficiency, safety and performance of various technological devices. It can be obtained applying passive and active methods. The former often involves trial-and-error attempts, which are based on geometry modifications and adding fixed elements to the flow domains. Prominent examples of passive control methods are combustion chambers where the efficiency of combustion process is directly related to fuel-oxidizer mixing and interactions between the flame and the flow field. The research is performed using large eddy simulation (LES) method [1] for turbulent flow simulation and Conditional Moment Closure (CMC) approach [2,3] for combustion modelling
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