Abstract:

The performance deterioration of WP7 engine, i.e, the turbine exit gas tempera-ture（t4） is higher or the thrust is lower than the specific value under full reheating condition is a key problem which has not solved for a long time. The causes of this kind of trouble are analysed by statistical data and theoretical calculation. They are found out that the ambient humidity, the performance degeneration of the turbine assembly, the ambient temperature and the nonuniformity of the field are the main factors that cause the performance deterioration. Some feasible measures are proposed to avoid or lessen this trouble.

Key words: aeroengine, reheating, failure analysis