Patent ID: 8105015

Claim:
A method for determining total pressure distribution across a fan entry plane of a fan situated within a fan casing provided with struts which are positioned upstream of the fan, with respect to the normal air flow direction through the fan, the method comprising the steps of: measuring static pressure at first measurement points on the leading edges of at least some of the struts; deriving local angularity (α) values at each measurement point from the respective static pressure measurements; deriving, from the local angularity (α) values, the total pressure loss at first derived points in the fan entry plane which correspond to the first measurement points; measuring static pressure at second measurement points around the intersection between the fan entry plane and the fan casing; deriving, from the static pressure measurements at the second measurement points, the total pressure loss at each second measurement point, and interpolating between total pressure loss values at the first derived points and the second measurement points to determine total pressure distribution across the fan entry plane.