These equations along with the velocity triangles show a favorable static pressure rise due to change in relative velocity (outlet relative velocity less than inlet) in the first stage and an unfavorable effect in the second stage. The opposite condition is apparent with respect to the influence of radius ratio. The ideal static-to-total pressure ratio in each stage defines their respective ideal reaction ratios.
In this analysis we use cascade principals, i.e., flow incidence, deflection (turning), deviation, and losses. Others, such as Kim et al. [34] use the slip factor approach. The blade relative inlet flow angle for the suction cascade is