Investigations on effects of free-stream mach numerber on flow and aeroacoustic characteristics in cavity

Author

Yang, Dang-guo ; Liang, Jin-min ; Li, Jian-qiang ; Luo, Xin-fu

Author_Institution

State Key Lab. of Aerodynamics, Mianyang, China

fYear

2010

fDate

10-13 Dec. 2010

Firstpage

46

Lastpage

50

Abstract

This paper presents effects of free-stream compressibility (Ma) on aeroacoustic characteristics inside different flow-type cavity with length-depth ratios (L/D) of 8, 12 and 15 at Mach numbers of 0.6, 0.9, 1.2, 1.5 and 1.8. The results indicate that free-stream compressibility (Ma) is a key parameter influencing flow type and aeroacoustic characteristics in the cavity. Increase in free-stream compressibility leads to increase in sound pressure level (SPL) and SPL at different discredited frequencies for measurement positions in the cavity. It also causes bad pressure fluctuating and intense aerodynamic noise, which has bad influence on self-structure security of the cavity and stored something.

Keywords

Mach number; acoustic intensity; acoustic noise; aeroacoustics; aerodynamics; compressible flow; confined flow; Mach number; aeroacoustic characteristics; cavity self-structure security; flow-type cavity; free-stream compressibility; intense aerodynamic noise; length-depth ratios; sound pressure level; Aerodynamics; Cavity resonators; Computational modeling; Frequency measurement; Noise; Numerical models; Oscillators; Cavity; Free-stream Mach numbers (Ma); SPFS; SPL; aeroacoustic characteristics;

fLanguage

English

Publisher

ieee

Conference_Titel

Piezoelectricity, Acoustic Waves and Device Applications (SPAWDA), 2010 Symposium on

Conference_Location

Xiamen

Print_ISBN

978-1-4244-9822-2

Type

conf

DOI

10.1109/SPAWDA.2010.5744272

Filename

5744272