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Experimental Study of Passive Control Method of Pipeline Cavity Flow
HUANG You;OUYANG Hua;WU Ya-dong;TIAN Jie;DU Zhao-hui
   2012, 32 (4): 46-50.   DOI: 10.3969/j.issn.1006-1355.2012.04.0011
Abstract （1635）            Save
Experiments were carried out in order to investigate the rectangular cavity flow of length-to-depth ratio of 5:1 using time-resolved particle image velocimetry (TR-PIV) technique. Three different passive control methods, including cylinder, sawtooth and rectangle body, were studied experimentally, having the same upstream velocity, i.e. 34 m/s. The experimental results show that the cylinder control method can increase shear layer thickness and effectively reduce the shear layer speed pulse and vorticity. Rectangle and sawtooth control methods will obviously raise shear layer to mainstream area, leading to no frontal impinging between the shear layer and the trailing edge of the cavity edge.
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Effect of Penetration on Aerodynamic Acoustic Characteristics of Chevron Nozzle
ZHU Xi-jia;OU-YANG Hua;TIAN Jie;DU Zhao-hui
   2011, 31 (5): 113-116.   DOI: 10.3969/j.issn.1006-1355-2011.05.026
Abstract （2025）            Save
Using TR-PIV technique and far-field measurement method, the aerodynamic acoustic characteristics of chevron nozzles with different penetrations have been studied at the Mach number Ma=0.12. Flow field results show that the chevron nozzles can reduce the potential core length and increase the mixing of the air flows in the core with the environment. With the penetration being higher, this tendency is increased. It is found that the chevron nozzles with high penetration can reduce low frequency noise, but increases high frequency noise; while the chevron nozzles with low penetration can reduce the global sound pressure level of the noise effectively. At aft angle of 150°, the chevron nozzle with low penetration can bring noise suppression by 1.3 dB. This work is of practical significance for jet noise control of factories.
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