12th European Conference on Turbomachinery Fluid dynamics & Thermodynamics
Active and passive flow control
Our paper describes the groundwork results of a study relating to the improvement of a high pressure centrifugal fan performance with the use of steady air injection at the inlet of two types impeller, namely with the forward and backward curved blades. Tests were carried out on a test rig with an external diameter of 400 mm. The maximum efficiency increase of 1.9% to 2.1% was observed in the fan with forward curved blades, if the air jet output was taken into account when carrying out the data analysis. Negative efficiency increment was observed within the Fan B working range.