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Accession Number
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ADA562553
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Title
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Transition and Transport in Turbomachinery.
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Publication Date
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Jun 2012
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Media Count
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11p
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Personal Author
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P. A. Durbin
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Abstract
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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.
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Keywords
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Algorithms
Boundary layer
Compressors
Computerized simulation
Navier stokes equations
Thickness
Turbomachinery
Two dimensional
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Source Agency
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Non Paid ADAS
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NTIS Subject Category
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41J - Tooling, Machinery, & Tools
81D - Jet & Gas Turbine Engines
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Corporate Author
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Iowa State Univ., Ames. Dept. of Aerospace Engineering.
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Document Type
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Technical report
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Title Note
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Final rept. 1 Mar 2007-30 Nov 2009.
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NTIS Issue Number
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1225
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Contract Number
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FA9550-07-1-0183
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