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Title: Large eddy simulation of high reynolds number jets with microjet injection
Authors: Rife, M.E.
Page, Gary J.
Issue Date: 2011
Publisher: Published by the American Institute of Aeronautics and Astronautics, Inc. © the author(s)
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.
Abstract: 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.
Description: This paper was presented at the 17th AIAA/CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference) 5 - 8 June 2011, Portland, Oregon.
Version: Published
URI: https://dspace.lboro.ac.uk/2134/9545
Appears in Collections:Conference Papers and Contributions (Aeronautical and Automotive Engineering)

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