|
|
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
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.
Related Articles |
Metrics
|
|
