An Experimental Study of Unsteady Wake-Induced Boundary Layer Transition in Turbomachinery

Lead Research Organisation: University of Manchester
Department Name: Mechanical Aerospace and Civil Eng

Abstract

Wake-induced transition typically occurs in multi-stage turbomachine. It affects the aerodynamic performance of turbine and compressor blades considerably. Although the various mechanisms of wake-induced transition have now been identified, the detailed processes are not yet understood. In this joint proposal, the University of Manchester will use a novel combination of PIV and liquid crystal flow visualization technique to conduct detailed measurements of wake-induced transitional events occurring in an attached laminar boundary layer and a separated boundary layer with a separation bubble. The University of Cambridge will use bar-passing cascades to study the breakdown mechanism initiated by incoming wakes in separated boundary layers and in the mixed-mode region of transitory separated/attached boundary layers that can arise when wake-induced transition begins before but is not complete by the point of laminar separation. The aims are to obtain a better understanding of the mechanisms of wake-induced transition in attached, separating and separated flows and to provide benchmark quality data for developing and validating computational models.

Publications

10 25 50
 
Description A better understanding of the growth and development of isolated regions of turbulence (turbulent spots) in a laminar boundary layer. A better understanding of the physical the boundary layer laminar to turbulent flow transition typically occurring in a multi-stage turbomachines.
Exploitation Route This finding has an important implication to the modelling of heat transfer of turbine blades and computational models of boundary layer transition in turbomachinery.
Sectors Aerospace, Defence and Marine

 
Description This finding has an important implication to the modelling of heat transfer of turbine blades and computational models of boundary layer transition in turbomachinery.
First Year Of Impact 2010
Sector Aerospace, Defence and Marine
 
Description Alstom 
Organisation Alstom
Country France 
Sector Private 
Start Year 2006
 
Description Rolls-Royce plc 
Organisation Rolls Royce Group Plc
Country United Kingdom 
Sector Private 
Start Year 2006
 
Description Siemens Industrial Turbomachinery Ltd 
Organisation Siemens AG
Department Siemens Industrial Turbomachinery Ltd
Country United Kingdom 
Sector Private 
Start Year 2006