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Thermophysics and Aeromechanics

2011 year, number 1

Transient growth of stationary flow perturbations at laminar boundary-layer separation

A.V. Boiko1, A.V. Dovgal1, A.M. Sorokin2
1 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS
2 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS; Novosibirsk State University
Keywords: hydrodynamic instability, flow separation, transient growth, aerodynamic experiment
Pages: 101-106


In a subsonic wind tunnel, laminar boundary-layer separation at a backward-facing step on a flat plate modulated by stationary flow perturbations was examined. The stationary disturbances were introduced into the flow by controlled roughness elements spaced on the model surface close to the separation line. Through a comparison of obtained data with results gained in previous studies of other periodic roughness systems, some trends in the generation of stationary disturbances subject to transient growth in separation region were revealed.