Improvement and validation of a planar cascade inverse design method

With the hypothesis that one fluid element moves along a curved average streamline in cascade passage due to the pressure force acting on the element,a feasible planar cascade inverse design method was introduced;the design parameters for yielding desired cascade geometry mainly include: inlet/outlet flow angles,section radius,prescribed profile loading and thickness distribution along axial chord.To supplement and improve original design method,a new theory was put forward,in which the density distribution along axial chord could be calculated,and the algorithm with leading/trailing circles was modified with obvious improvement of cascade aerodynamic performance.To validate the improved cascade design method,the Aachen turbine cascade from Germany was re-designed in this paper.