Theoretical and experimental investigations of laminar- Turbulent transition in the non-isothermal boundary layer

Aerodynamic losses and local heat transfer coefficients on the streamlined surface depend on the length of laminar, transition and turbulent boundary layer on this surface. In real conditions many factors influence on the development of boundary layer. Therefore the investigations of laminar-turbulent transition were carried out at combined action of longitudinal pressure gradient, Reynolds number, external flow turbulence intensity, temperature factor, curvature and roughness of streamlined surface. The regularities of boundary layer development and its characteristics in the laminar and transition zones were determined.