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Control of turbulent flow

Model of a reproduced shark skin
Noise reductions, improvements in efficiency and fuel-saving can be reached by controlling turbulent flows. Various experimental setups are used for the development and realisation of suitable measures for the control of turbulent flows.

	The control of secondary flow in compressor cascades Secondary flows like the separation in the corner between the sidewall and the vane in a compressor are responsible for a large part of aerodynamic losses in turbine-engines. By the decrease of losses it is possible to achieve an efficiency enhancement. more information
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	Turbulent skin friction reduction with riblets Skin friction reducing riblet surfaces consist of very small grooves with sharp ridges which have to be aligned with the mean flow.
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	Hitzdrahtmessungen in Turbomaschinen Mit der DLR-Hitzdrahtmesstechnik lassen sich instationäre Strömungsfelder an schnell rotierenden Verdichtern detailliert erfassen und analysieren
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	Lift enhancement by Gurney – flaps Gurney-Flaps are small trailing edge flaps on airfoils leading to a considerable lift augmentation. The associated drag increase is successfully reduced by passive means.
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	Lift enhancement by self actuating flaps (Artificial bird feathers) Self actuating flaps are the technical application of the covering feathers of birds. They reduce flow separation on airfoils, increase the high- lift and improve flight performance.
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Control of turbulent flow

The control of secondary flow in compressor cascades

Turbulent skin friction reduction with riblets

Hitzdrahtmessungen in Turbomaschinen

Lift enhancement by Gurney – flaps

Lift enhancement by self actuating flaps (Artificial bird feathers)