Highly loaded tandem compressor cascade with variable camber and stagger

Abstract

Highly loaded compressors, resulting from high pressure ratios and as few compressor stages as possible, need not only stators with variable stagger but furthermore with variable camber. By this means the blading can be adapted to the velocity triangles at off-design engine power setting leading to less sacrifice of the cycle efficiency and thus better engine power and improved fuel consumption. Stators with variable stagger and camber can be accomplished by a tandem stator design where both stator blades can be adjusted independently from each other. In this investigation the usable range of such a tandem arrangement is measured and it is shown how the interference between the two blades can decrease losses in comparison with the two single blades of the tandem arrangement. Furthermore an inviscid flow calculation with a 2D-Euler-code shows the influence of this interference on the whole flow field.