The Effect of the Pressure Distribution in a Three-Dimensional Flow Field of a Cascade on the Type of Curved Blade

Abstract

The effect of the pressure distribution in a three-dimensional flow field of a cascade on the type of curved blade is discussed in this paper through analysing the experimental results and numerical calculative results. Using curved blades, we can obtain “C” type pressure distribution along the blade height in the passage. For the expansion cascade, energy loss in the cascade can be reduced if positive curved blades are used. For guide vanes and compressor cascades, the choice of using positive curved blades or negative curved blades relies on the pressure gradient on the blade midspan suction surface along the direction of flow and whether there exists a separation of the boundary layer there. However, all of these need further studies and discussions.