The influence of geometry on jet plume development

Xia, H, Tucker, P G, Eastwood, S and Mahak, M (2012) The influence of geometry on jet plume development. Progress in Aerospace Sciences, 52. pp. 56-66. ISSN 0376-0421

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Our recent efforts of using large-eddy simulation (LES) type methods to study complex and realistic geometry single stream and co-flow nozzle jets and acoustics are summarized in this paper. For the LES, since the solver being used tends towards having dissipative qualities, the subgrid scale (SGS) model is omitted, giving a numerical type LES (NLES). To overcome near wall streak resolution problems a near wall RANS (Reynolds averaged Navier–Stokes) model is smoothly blended in the LES making a hybrid RANS–NLES approach. Several complex nozzle geometries including the serrated (chevron) nozzle, realistic co-axial nozzles with eccentricity, pylon and wing–flap are discussed. The hybrid RANS–NLES simulations show encouraging predictions for the chevron jets. The chevrons are known to increase the high frequency noise at high polar angles, but decrease the low frequency noise at lower angles. The deflection effect of the potential core has an important mechanism of noise reduction. As for co-axial nozzles, the eccentricity, the pylon and the deployed wing–flap are shown to influence the flow development, especially the former to the length of potential core and the latter two having a significant impact on peak turbulence levels and spreading rates. The studies suggest that complex and real geometry effects are influential and should be taken into count when moving towards real engine simulations.

Item Type: Article
Keywords: Hybrid RANS-LES; Chevron nozzle; Co-flow jets; Eccentricity; Jet/pylon interaction; Jet/wing–flap interaction
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA0349 Mechanics of engineering. Applied mechanics > TA0357 Applied fluid mechanics
Depositing User: Hao Xia
Date Deposited: 04 Mar 2013 08:39
Last Modified: 04 Mar 2013 08:39

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