Statistics and structure of turbulence in a fan/FEGV interstage and their aeroacoustic implications

Sheryl Grace, Ankush Gupta, Ignacio Gonzalez-Martino, Damiano Casalino

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

1 Citation (Scopus)

Abstract

Modern computational capabilities make simulations of complicated flow fields such as those in the fan stage of a turbofan engine possible. In particular, time resolved simulations are presenting new opportunities for studying the disturbances responsible for the broadband noise created by the fan stage. A preliminary quantitative analysis of the simulated flow field in the gap between the fan and fan exit guide vane (FEGV) computed with the Lattice Boltzmann based software PowerFLOW is presented. The study compares the simulated flow with experimental measurements to assess the mean flow, the turbulence intensity, the turbulence length scale and the turbulence dissipation rate. The potential field of the exit guide vane is shown to influence the mean flow but not the turbulence intensity just upstream of the vane. The change in the mean flow is shown to only affect the broadband noise downstream of the FEGV slightly. The wake is shown to be more diffuse than measured experimentally and the turbulence length scale of the simulated data is 1.5 times greater than that deduced from the measurements while the simulation based dissipation rate is slightly less than the measurement based value. The overprediction of the length scale is shown to potentially have a significant effect on the broadband noise. It is hypothesized that the overprediction is due to the usage of a trip to trigger the turbulent transition on the rotor blade in the computation. This preliminary study provides a path for more detailed wake evolution analysis using the simulation data as well as further flow comparisons for different stage configurations and fan operating speeds.

Original languageEnglish
Title of host publication2018 AIAA/CEAS Aeroacoustics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages18
ISBN (Electronic)9781624105609
DOIs
Publication statusPublished - 1 Jan 2018
EventAIAA/CEAS Aeroacoustics Conference, 2018 - Atlanta, United States
Duration: 25 Jun 201829 Jun 2018

Conference

ConferenceAIAA/CEAS Aeroacoustics Conference, 2018
CountryUnited States
CityAtlanta
Period25/06/1829/06/18

Fingerprint Dive into the research topics of 'Statistics and structure of turbulence in a fan/FEGV interstage and their aeroacoustic implications'. Together they form a unique fingerprint.

Cite this