Effect of Shape of Two-Dimensional Smooth Hump on Boundary Layer Instability
作者： Donghun Park , Sejong Oh
DOI: 10.1007/S42405-020-00268-5
关键词: Growth rate 、 Mechanics 、 Boundary (topology) 、 Instability 、 Supersonic speed 、 Compressibility 、 Hypersonic speed 、 Materials science 、 Reynolds number 、 Boundary layer
摘要: Effect of hump shape on boundary layer instability is investigated for incompressible, supersonic, and hypersonic speed regimes. Flat-plate layers over a two-dimensional smooth five different geometries are considered. The linear evolution waves analyzed by using the parabolized stability equation. resulting growth rate N-factor compared several frequencies. destabilization effect evaluated in terms change N-factor. overall influence also assessed comparisons envelopes predicted transition locations based eN-method. Results show that greatest incompressible case. degree appears to depend not only area but other geometric parameters. variation Reynolds number depending pronounced certain range heights. Although supersonic exhibits similar characteristics, effectiveness rather low, relatively insensitive shape. In case layer, either or stabilization effect, relative location synchronization point. depends strongly both frequency. Either delay early could be critical value employed. Unlike case, dependency confined
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