Convective heat transfer to gas turbine blades.
This thesis initially describes the experimental
work which was carried out in order to examine the
effects of parameters such as the blade profile, free
stream turbulence intensity etc. on the onset and,
extent of transition in the boundary layer on a turbine
A series of four different blade profiles with
identical pressure surfaces but different suction
surfaces, were tested. The suction surfaces differed
in the severity and extent of their initial favourable
pressure gradients. Tests were carried out for a range
of throat Mach numbers and free stream turbulence
From the results obtained it is suggested that the
most significant factor is 'the severity of the initial.
favourable pressure gradient. This appears to have an
inhibiting effect on the influence of the free stream
turbulence and on the growth of the turbulent stresses
in the transition region.
Using these hypotheses, modifications were made to an
existing boundary layer prediction program in order to
provide a better transition-model and to include the effect
of free stream turbulence.