AIAA-2011-2882-rife.pdf (8.21 MB)
Large eddy simulation of high reynolds number jets with microjet injection
Large eddy simulations of two isothermal Mach 0.75 jets have been performed, one of a
clean jet and one of the same jet fitted with eight equally spaced microjets. The microjets
have a pressure ratio of 2.38, with a fully expanded Mach number of 1.19. The Reynolds
number of the main jet in both simulations, based on the jet core velocity and diameter,
is 1.3 million. The simulations were performed on a cylindrical, structured, multiblock
mesh created for the clean round jet. The microjets are introduced as pressure inlet areas
within the computational domain, so avoiding the complication of modelling the microjet
feed pipes. Results of the clean jet simulation agree well with experimental data. The
simulation shows the microjets penetrating into the jet core and disrupting the otherwise
circular nature of the shear layer in the early flow development regions, though no change
in mean flow variables is noticed by the end of the potential core. Two-point two-time
correlation are performed on both cases and compared. The results show the microjets
reduce the second and fourth order correlation amplitudes and turbulent lengthscales even
at large axial locations downstream of the nozzle exit, where the effect of the microjets on
the mean flow field is not present. This gives evidence as to how the microjets are able to
reduce jet noise levels.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Citation
RIFE, M.E. and PAGE, G.J., 2011. Large eddy simulation of high reynolds number jets with microjet injection. 17th AIAA/CEAS Aeroacoustics Conference, 32nd AIAA Aeroacoustics Conference, Portland, Oregon, 5 - 8 June. AIAA 2011-2882.Publisher
Published by the American Institute of Aeronautics and Astronautics, Inc. © the author(s)Version
- VoR (Version of Record)
Publication date
2011Notes
This paper was presented at the 17th AIAA/CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference) 5 - 8 June 2011, Portland, Oregon.Language
- en