DOI: 10.1615/ICHMT.1994.IntSympHetatTransTurb
ISBN Print: 1-56700-016-9
ISBN Print: 978-1-56700-016-0
Heat Exchange and Fluid Dynamics in Cascade Nozzles of Gas-Turbine Engines with High-Intensity Secondary and Vortex Flows
摘要
The paper presents the findings of experimental study of local heat exchange, film cooling effectiveness, and fluid dynamics on the endwall surface of a curvilinear channel and of a cascade nozzle of a high-temperature gas turbine with a low aspect ratio of the passage. The effect of injection, external turbulence, an initial thickness of the boundary layer, secondary flows in the boundary layer, horseshoe, passage, and angular vortices has been investigated. The equations have been derived for calculating" heat exchange and film cooling effectiveness that allow for the curvature of streamlines, secondary and vortex flows, additional effects near the convex and concave surfaces, and longitudinal pressure gradient. The results of studying a combined film cooling with supplying a portion of the coolant from the side of a concave surface have been considered.