| 摘要 |
A method for determining total pressure distribution across a fan entry plane 16 of a fan 4 situated within a fan casing 12 provided with struts 10 which are positioned upstream of the fan 4, with respect to the normal air flow direction through the fan 4. The method comprises the steps of measuring static pressure at first measurement points 20 on the leading edges of at least some of the struts 10; deriving local angularity values at each measurement point 20 from the respective static pressure measurements via static pressure probes 18; deriving, from the local angularity values, the total pressure loss at first derived points in the fan entry plane which correspond to the first measurement points 20; measuring static pressure at second measurement points 26 around the intersection between the fan entry plane 16 and the fan casing 12; deriving, from the static pressure measurements via static pressure probes 24 at the second measurement points 26, the total pressure loss at each second measurement point 26, 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 16. |
