WP 3: FAN SURGE SOLUTION

Numerical experiments have been performed with the final fan design. The improvement in the flow stability margin with respect to the same design but without any anti-stall device has been analyzed. It has been found that with the current design which includes an anti-stall ring with skewed static vanes, the anti-stall margin is improved by 50%. However a further improvement is needed in order to achieve a larger stall security margin.

In order to verify the project specification, experimental bench is being built in order to confirm the numerical data and also to test further design improvements which will allow to meet the specified requirements.

(Numerical pressure rise values obtained with the final design with anti-stall ring overlapped with the performance curve of the non stabilized fan)

(Streamlines of the absolute velocity field at 0.771)

(Streamlines of the absolute velocity field at 0.4