RAN Ling-ke, YANG Hai-hua, ZHANG Xing-chen, WAN Zhen-hua, SUN De-jun. Investigation of Flow Development and Noise Generation of Free and Chevron Jets[J]. Applied Mathematics and Mechanics, 2016, 37(12): 1255-1271. doi: 10.21656/1000-0887.370507
Citation: RAN Ling-ke, YANG Hai-hua, ZHANG Xing-chen, WAN Zhen-hua, SUN De-jun. Investigation of Flow Development and Noise Generation of Free and Chevron Jets[J]. Applied Mathematics and Mechanics, 2016, 37(12): 1255-1271. doi: 10.21656/1000-0887.370507

Investigation of Flow Development and Noise Generation of Free and Chevron Jets

doi: 10.21656/1000-0887.370507
Funds:  Project supported by the National Natural Science Foundation of China(11232011;11402262;11621202;11572314)
  • Received Date: 2016-11-06
  • Rev Recd Date: 2016-11-29
  • Publish Date: 2016-12-15
  • Large eddy simulation (LES) is performed to study high subsonic round and chevron jets with a diameterbased Reynolds number Re=105.2 different chevron jet flows are considered, which are with 6 lobes and 4 lobes respectively.The simulation results are checked by comparing mean axial velocity profiles and overall sound pressure levels (OASPLs) of the round jet with the existent experimental and LES results, and they are in good agreement with each other. Then the properties of chevron jets are compared with those of round jets. The chevron jets show higher radial expansion rate in the nearnozzle region and shorter potential core lengths. The OASPLs of the chevron jets decrease as high as 4 dB at the shallow angles compared with the round jets and without apparent noise increment at the sideline. 3 azimuthal modes,m=0,1,2of the farfield pressure fluctuations from both the round and chevron jets are investigated. All cases show similar OASPL distribution profiles vs. the polar angles for each azimuthal mode. But, apparent noise increment is found at high polar angles in the zeroth and first azimuthal modes for the chevron jet with 4 lobes when compared with the round jet. By performing proper orthogonal decomposition (POD), the most energetic coherent structures at specified coupled azimuthal wavenumbers are extracted. The wavepacket features associated with coherent structures of round and chevron jets are analyzed in detail to explain changes of noise properties in the far fields.
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