Experimental measurements were performed in a low speed wind tunnel for both original and modified turbine LGV's which are used in turbofan engines under different operating conditions.Compared with the original design

the modified design changed many geometry parameters

including adopted optimizing meridional endwall profile

positively curved blade

aft-loading airfoil and negative incidence angle at the leading edge

so the incidence characteristics of these two designs differ significantly.The two LGV's were measured at three operating conditions

i.e.positive incidence

design and negative incidence operating conditions.Results show that the modified design not only has smaller energy loss

but also has better incidence angle adjustability

which means that with the change of operating conditions total pressure loss alters smaller in the range of three operating conditions.Exit loss of the original design is sensitive to the incidence angle and varies greatly.