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Investigation of Phase Excitation Effect on Mixing Control in Coaxial Jets

Journal of Thermal Science 2009年第4期18卷 364-369页

作者： yanming liu,baoguo wang and shuyan liuschool of aerospace engineering,beijing institute of technology,beijing,100081,china School of aerospace engineering Beijing Institute of Technology Beijing 100081 China

Detailed unsteady numerical simulation has been carried out to investigate the mechanism of adjacent syntheticjets and the influence of different phases on the mixing of coaxial jets. The results show the combined jet, formedby coupling the vortex pairs at the orifice of two adjacent actuators, can exhibit better controlling effect. Spanwisepressure difference appears because of the existence of phase difference between the left jet and right jet, whichresults in the variation of the combined jet. When the phase difference is greater than zero, mixing enhancementof coaxial jets can be achieved, but there are maximum phase difference and optimal phase difference. On thecontrary, application of adjacent synthetic jets always leads to the mixing reduction when phase difference is lessthan zero.

关键词： adjacent synthetic jets phase difference mixing controlling ability

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Numerical Simulation of High-Power Synthetic Jet Actuator Flowfield and its Influence on Mixing Control

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Journal of Thermal Science 2008年第3期17卷 207-211页

作者： yanming liu baoguo wang shuyan liu School of aerospace Science and engineering Beijing Institute of Technology Beijing 100081 China

Detailed two-dimensional unsteady numerical simulation is carried out to investigate a high-power synthetic jet actuator flow field and its design characteristic. Simultaneously, mixing control mechanism of coaxial jets with actuators is also studied. Firstly, excitation frequency （rotating speed）, piston displacement and its exit slot width have effect on the controlling ability and controlling efficiency of actuator. With the invariable model and con- cerned parameters, the actuator becomes more desirable as the rotating speed increases. Average velocity and maximal velocity at the actuator exit section increase as the piston displacement enlarges or the exit slot width decreases. But the actuator does not always exhibit good performance with the narrower exit. Secondly, the synthetic jets also have the ＂push＂ effect on the coaxial jets, which results in the fluctuation of vorticity and temperature distribution of mixing flowfield. Finally, the employment of synthetic jet actuator can achieve mixing enhancement significantly.

关键词： High-power synthetic jet actuator Mixing control Exit velocity Mixing enhancement

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