In the article, a set of deviation angle models, which are used to predict the off-design performance high-pressure
turbines, has been presented, basing on a literature study. The deviation angle is a deviation between the actual flow
angle and the blade inclination angle. It is an essential parameter in turbine performance evaluation. This angle shall
be obtained accurately in 1-D design and evaluation, so as to ensure the validity of blade profiling and calculation
results. If deviation angle is ignored, the turbine will produce a lower change of tangential velocity, and consequently
a lower torque, output work and enthalpy drop than intended by the designer. For this reason, the deviation angle
model needs to be established. There exist a number of different deviation models, resulting in varying degrees of flow
deviation when applied. In the article, correlations for gas outlet angle, dependent on the Mach number at outlet and
determined by the blade loading towards the trailing edge has been presented. The main difficulty in establishing the
deviation model is a continuity in defining the angle for all speed ranges (both subcritical and supercritical). Each of
the models presented in the article deals with this problem in a different way. A few deviation models, briefly
discussed in the article, are based on experimental data and one is based on analytical approach.
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