Accession Number ADA562553
Title Transition and Transport in Turbomachinery.
Publication Date Jun 2012
Media Count 11p
Personal Author P. A. Durbin
Abstract The interaction of discrete and continuous Orr-Sommerfeld modes in a boundary layer is studied by computer simulation. The discrete mode is an unstable Tollmein-Schlichting wave. The continuous modes generate jet-like disturbances inside the boundary layer. Either mode alone does not cause transition to turbulence; however, the interaction between them does. The continuous mode jets distort the discrete modes, producing Lambda shaped vortices. Breakdown to turbulence is subsequent. The lateral spacing of the Lambda's is sometimes the same as that of the wavelength continuous modes, sometimes it differs, depending on the ratio of wavelength to boundary layer thickness.
Keywords Algorithms
Boundary layer
Compressors
Computerized simulation
Navier stokes equations
Thickness
Turbomachinery
Two dimensional


 
Source Agency Non Paid ADAS
NTIS Subject Category 41J - Tooling, Machinery, & Tools
81D - Jet & Gas Turbine Engines
Corporate Author Iowa State Univ., Ames. Dept. of Aerospace Engineering.
Document Type Technical report
Title Note Final rept. 1 Mar 2007-30 Nov 2009.
NTIS Issue Number 1225
Contract Number FA9550-07-1-0183

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