Analysis of the Vortex Street Generated at the Core-Bypass Lip of a Jet-Engine Nozzle Articles uri icon

publication date

  • January 2008

start page

  • 419

end page

  • 428

volume

  • 112

international standard serial number (ISSN)

  • 0303-4216

electronic international standard serial number (EISSN)

  • 1437-0859

abstract

  • The reduction of the noise generated by jet-engine aircrafts is of growing concern in the present society. A better understanding of the aircraft noise production and the development of predictive tools is of great interest. Within this framework, the CoJeN (Coaxial Jet Noise) European Project includes the measurement of the flow field and the noise generated by typical turbofan jet-engine nozzles. One of the many aspects of interest is the occasional presence of acoustic tones of a defined frequency, symptomatic of the presence of quasiperiodic coherent structures within the flow. This chapter analyzes the characteristics of a vortex street in the core-bypass lip of one of the nozzles under study. The measurements were made by means of advanced PIV techniques within the above-mentioned project.