A Study of Parameter Optimization of Axial Compressor Tandem Cascade

To develop an optimization system for tandem cascades, an algorithm of tandem airfoil parameterization is first proposed. A conventional cascade is then redesigned as a tandem cascade, which decreases the total loss coefficient by 41.8% and increases the static pressure rise by 0.92% at design point. A master-slave parallel differential evolution algorithm is developed for the following optimization. Five configuration parameters of the tandem cascade are optimized, which decreases the total loss coefficient by 8.67% and increases the static pressure rise by 0.3% at design point. A partial correlation coefficient analysis of optimization history data reveals the influence priority of the five configuration parameters on tandem cascade performance. It is proposed and verified that the front-rear distributions of camber and chord can affect the performances at different incidence angles. A new parameter is then defined to measure the distribution above and able to control the characteristics at different incidence angles. A more superior design at overall incidence angles is achieved by adjusting that parameter.