Abstract
A design methodology is presented for turbines in an annulus with high endwall angles. Such stages occur where large radial offsets between the stage inlet and stage outlet are required, for example in the first stage of modern low pressure turbines, and are becoming more prevalent as bypass ratios increase. The turbine vanes operate within s-shaped ducts which result in meridional curvature being of a similar magnitude to the blade-to-blade curvature. Through a systematic series of idealised computational cases, the importance of two aspects of vane design are shown. First, the region of peak endwall meridional curvature is best located with the vane row. Second, the vane should be leant so as to minimise spanwise variations in surface pressure — this condition is termed ‘ideal lean’. This design philosophy is applied to the first stage of a low pressure turbine with high endwall angles.
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