一种控制气流分离的无源微脉冲射流技术研究

doi:10.7527/S1000-6893.2013.0261

Abstract

Abstract:

Based on the flow separation characteristics in a compressor, a micro pulsed aspirated jet concept is presented and experiments are conducted on them, which shows that an obvious pulsed jet can be generated and the jet frequency can be continuously adjusted.Combined with this new unsteady control method, an imitating cascade channel is established. The steady and dynamic pressure characteristics in the no control state are obtained, and the characteristic frequency of the separated vortex is found to be about 266 Hz. Finally, the experiment of controlling separation flow by pulsed jet is performed, and the frequency of the pulsed jet lies between 60-600 Hz. Results show that when the frequency of the pulsed jet is close to the characteristic frequency of the separated vortex, the control effect is more obvious. Meanwhile, the periodic characteristics of the dominant vortex are significantly improved, while the influence of other vortices on the flow field is weakened. The flow structure is more orderly in comparison to no control, steady control and other frequency pulsed control states.

Key words: pulsed jet, unsteadiness, flow separation, imitating cascade channel, experiment

CLC Number:

ZHU Jianfeng, HUANG Guoping, FU Xin, FU Yong. Investigation of Technology for Controlling Flow Separation by Micro-pulsed-jet Without External Device[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(8): 1757-1767.

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Investigation of Technology for Controlling Flow Separation by Micro-pulsed-jet Without External Device

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